first commit

.air.toml

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+root = "."
+tmp_dir = "tmp"
+
+[build]
+  entrypoint = ["./tmp/main", "--port", "8081"]
+  cmd = "go build -o ./tmp/main ./cmd/memos"
+  delay = 2000
+  exclude_dir = ["assets", "tmp", "vendor", "web", "proto/gen", "arms_cache", "store/migration"]
+  include_ext = ["go", "yaml", "yml", "toml"]
+  exclude_regex = ["_test.go"]
+
+[log]
+  time = true
+
+[color]
+  app = "cyan"
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "blue"
+
+[screen]
+  clear_on_rebuild = true
+  keep_scroll = true

.dockerignore

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+web/node_modules
+web/dist
+.git
+.github
+build/
+tmp/
+memos
+*.md
+.gitignore
+.golangci.yaml
+.dockerignore
+docs/
+.DS_Store

.github/FUNDING.yml

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+github: usememos

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: If something isn't working as expected
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to report a bug! Please complete the form below to help us understand and fix the issue.
+
+  - type: checkboxes
+    id: pre-check
+    attributes:
+      label: Pre-submission Checklist
+      description: Please confirm you have completed the following steps before submitting
+      options:
+        - label: I have searched the existing issues and this bug has not been reported yet
+          required: true
+        - label: I have tested this issue on the [demo site](https://demo.usememos.com) or the latest version
+          required: true
+
+  - type: dropdown
+    id: issue-location
+    attributes:
+      label: Where did you encounter this bug?
+      description: Select where you tested and confirmed this issue
+      options:
+        - Latest stable version (self-hosted)
+        - Latest development version (self-hosted)
+        - Demo site (demo.usememos.com)
+        - Older version (please specify below)
+      default: 0
+    validations:
+      required: true
+
+  - type: input
+    id: version
+    attributes:
+      label: Memos Version
+      description: Provide the exact version (e.g., `v0.25.2`). Find this in Settings → About or via `--version` flag
+      placeholder: v0.25.2
+    validations:
+      required: true
+
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is
+      placeholder: When I try to..., the application...
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: Steps to Reproduce
+      description: Detailed steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+      placeholder: I expected...
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Screenshots & Additional Context
+      description: Add screenshots, browser/OS info, deployment method (Docker/binary), or any other relevant details
+      placeholder: |
+        - Browser: Chrome 120
+        - OS: macOS 14
+        - Deployment: Docker
+        - Database: SQLite

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: If you have a suggestion for a new feature
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for suggesting a new feature! Please complete the form below to help us understand your idea.
+
+  - type: checkboxes
+    id: pre-check
+    attributes:
+      label: Pre-submission Checklist
+      description: Please confirm you have completed the following steps before submitting
+      options:
+        - label: I have searched the existing issues and this feature has not been requested yet
+          required: true
+
+  - type: dropdown
+    id: feature-type
+    attributes:
+      label: Type of Feature
+      description: What type of feature is this?
+      options:
+        - User Interface (UI)
+        - User Experience (UX)
+        - API / Backend
+        - Documentation
+        - Integrations / Plugins
+        - Security / Privacy
+        - Performance
+        - Other
+      default: 0
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem-statement
+    attributes:
+      label: Problem or Use Case
+      description: What problem does this feature solve? What are you trying to accomplish?
+      placeholder: |
+        I often need to... but currently there's no way to...
+        This would help me/users to...
+    validations:
+      required: true
+
+  - type: textarea
+    id: proposed-solution
+    attributes:
+      label: Proposed Solution
+      description: A clear and concise description of what you want to happen
+      placeholder: |
+        It would be great if Memos could...
+        For example, a button/feature that...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered any alternative solutions or workarounds?
+      placeholder: |
+        I've tried... but it doesn't work well because...
+        An alternative could be...
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Add any other context, mockups, screenshots, or examples about the feature request
+      placeholder: |
+        - Similar feature in other apps: ...
+        - Mockups or screenshots: ...
+        - Related discussions: ...

.github/workflows/backend-tests.yml

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+name: Backend Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    paths:
+      - "go.mod"
+      - "go.sum"
+      - "**.go"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  GO_VERSION: "1.25.7"
+
+jobs:
+  static-checks:
+    name: Static Checks
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+      
+      - name: Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+          cache-dependency-path: go.sum
+
+      - name: Verify go.mod is tidy
+        run: |
+          go mod tidy -go=${{ env.GO_VERSION }}
+          git diff --exit-code
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v9
+        with:
+          version: v2.4.0
+          args: --timeout=3m
+
+  tests:
+    name: Tests (${{ matrix.test-group }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        test-group: [store, server, plugin, other]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+      
+      - name: Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+          cache-dependency-path: go.sum
+
+      - name: Run tests
+        run: |
+          case "${{ matrix.test-group }}" in
+            store)
+              # Run store tests for all drivers (sqlite, mysql, postgres)
+              go test -v -coverprofile=coverage.out -covermode=atomic ./store/...
+              ;;
+            server)
+              go test -v -race -coverprofile=coverage.out -covermode=atomic ./server/...
+              ;;
+            plugin)
+              go test -v -race -coverprofile=coverage.out -covermode=atomic ./plugin/...
+              ;;
+            other)
+              go test -v -race -coverprofile=coverage.out -covermode=atomic \
+                ./cmd/... ./internal/... ./proto/...
+              ;;
+          esac
+        env:
+          DRIVER: ${{ matrix.test-group == 'store' && '' || 'sqlite' }}
+
+      - name: Upload coverage
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        uses: codecov/codecov-action@v5
+        with:
+          files: ./coverage.out
+          flags: ${{ matrix.test-group }}
+          fail_ci_if_error: false

.github/workflows/build-binaries.yml

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+name: Build Binaries
+
+# Build multi-platform binaries on release or manual trigger
+# Produces distributable packages for Linux, macOS, and Windows
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+# Environment variables for build configuration
+env:
+  GO_VERSION: "1.25.7"
+  NODE_VERSION: "22"
+  PNPM_VERSION: "10"
+  ARTIFACT_RETENTION_DAYS: 60
+  # Artifact naming: {ARTIFACT_PREFIX}_{version}_{os}_{arch}.tar.gz|zip
+  ARTIFACT_PREFIX: memos
+
+jobs:
+  # Job 1: Extract version information
+  # - For git tags: use tag version (e.g., v0.28.1 -> 0.28.1)
+  # - For branches: use branch-name-shortSHA format
+  prepare:
+    name: Extract Version
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.version.outputs.version }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0  # Full history for git describe
+
+      - name: Extract version
+        id: version
+        run: |
+          # Try to get version from git tag
+          TAG=$(git describe --tags --exact-match 2>/dev/null || echo "")
+          if [ -n "$TAG" ]; then
+            echo "version=${TAG#v}" >> $GITHUB_OUTPUT
+            echo "Version from tag: ${TAG#v}"
+          else
+            # Use branch name + short SHA
+            BRANCH="${GITHUB_REF_NAME//\//-}"
+            SHORT_SHA="${GITHUB_SHA:0:7}"
+            echo "version=${BRANCH}-${SHORT_SHA}" >> $GITHUB_OUTPUT
+            echo "Version from branch: ${BRANCH}-${SHORT_SHA}"
+          fi
+
+  # Job 2: Build frontend assets
+  # - Builds React frontend with Vite
+  # - Produces static files that will be embedded in Go binary
+  # - Shared across all platform builds
+  build-frontend:
+    name: Build Frontend
+    needs: prepare
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4.2.0
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: pnpm
+          cache-dependency-path: web/pnpm-lock.yaml
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: echo "STORE_PATH=$(pnpm store path)" >> $GITHUB_OUTPUT
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v5
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('web/pnpm-lock.yaml') }}
+          restore-keys: ${{ runner.os }}-pnpm-store-
+
+      - name: Install dependencies
+        working-directory: web
+        run: pnpm install --frozen-lockfile
+
+      - name: Build frontend
+        working-directory: web
+        run: pnpm release
+
+      - name: Upload frontend artifacts
+        uses: actions/upload-artifact@v6
+        with:
+          name: frontend-dist
+          path: server/router/frontend/dist
+          retention-days: ${{ env.ARTIFACT_RETENTION_DAYS }}
+
+  # Job 3: Build Go binaries for multiple platforms
+  # - Cross-compiles using native Go toolchain
+  # - Embeds frontend assets built in previous job
+  # - Produces static binaries with no external dependencies
+  # - Packages as tar.gz (Unix) or zip (Windows)
+  build-binaries:
+    name: Build ${{ matrix.goos }}-${{ matrix.goarch }}${{ matrix.goarm && format('v{0}', matrix.goarm) || '' }}
+    needs: [prepare, build-frontend]
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Linux targets
+          - goos: linux
+            goarch: amd64
+          - goos: linux
+            goarch: arm64
+          - goos: linux
+            goarch: arm
+            goarm: "7"
+          # macOS targets
+          - goos: darwin
+            goarch: amd64  # Intel Macs
+          - goos: darwin
+            goarch: arm64  # Apple Silicon
+          # Windows targets
+          - goos: windows
+            goarch: amd64
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: true
+
+      - name: Download frontend artifacts
+        uses: actions/download-artifact@v7
+        with:
+          name: frontend-dist
+          path: server/router/frontend/dist
+
+      - name: Build binary
+        env:
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
+          GOARM: ${{ matrix.goarm }}
+          CGO_ENABLED: "0"
+        run: |
+          # Determine output binary name
+          OUTPUT_NAME="memos"
+          if [ "$GOOS" = "windows" ]; then
+            OUTPUT_NAME="memos.exe"
+          fi
+
+          mkdir -p build
+
+          # Build static binary with optimizations
+          go build \
+            -trimpath \
+            -ldflags="-s -w -extldflags '-static'" \
+            -tags netgo,osusergo \
+            -o "build/${OUTPUT_NAME}" \
+            ./cmd/memos
+
+          echo "✓ Built: build/${OUTPUT_NAME}"
+          ls -lh build/
+
+      - name: Package binary
+        id: package
+        env:
+          VERSION: ${{ needs.prepare.outputs.version }}
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
+          GOARM: ${{ matrix.goarm }}
+        run: |
+          cd build
+
+          # Construct package name: {prefix}_{version}_{os}_{arch}[v{arm_version}]
+          PACKAGE_NAME="${ARTIFACT_PREFIX}_${VERSION}_${GOOS}_${GOARCH}"
+          if [ -n "$GOARM" ]; then
+            PACKAGE_NAME="${PACKAGE_NAME}v${GOARM}"
+          fi
+
+          # Package based on platform
+          if [ "$GOOS" = "windows" ]; then
+            ARTIFACT_NAME="${PACKAGE_NAME}.zip"
+            zip -q "${ARTIFACT_NAME}" memos.exe
+          else
+            ARTIFACT_NAME="${PACKAGE_NAME}.tar.gz"
+            tar czf "${ARTIFACT_NAME}" memos
+          fi
+
+          # Output for next step
+          echo "ARTIFACT_NAME=${ARTIFACT_NAME}" >> $GITHUB_ENV
+          echo "✓ Package created: ${ARTIFACT_NAME} ($(du -h "${ARTIFACT_NAME}" | cut -f1))"
+
+      - name: Upload binary artifact
+        uses: actions/upload-artifact@v6
+        with:
+          name: ${{ env.ARTIFACT_NAME }}
+          path: build/${{ env.ARTIFACT_NAME }}
+          retention-days: ${{ env.ARTIFACT_RETENTION_DAYS }}
+
+  # Job 4: Upload artifacts to GitHub Release
+  # - Only runs when triggered by a release publish event
+  # - Downloads all built artifacts and attaches them to the release
+  release:
+    name: Upload Release Assets
+    needs: build-binaries
+    if: github.event_name == 'release'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Download all artifacts
+        uses: actions/download-artifact@v7
+        with:
+          path: artifacts
+          pattern: ${{ env.ARTIFACT_PREFIX }}_*
+          merge-multiple: true
+
+      - name: Upload to GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: artifacts/*
+

.github/workflows/build-canary-image.yml

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+name: Build Canary Image
+
+on:
+  push:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.repository }}
+  cancel-in-progress: true
+
+jobs:
+  build-frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: pnpm/action-setup@v4.2.0
+        with:
+          version: 10
+      - uses: actions/setup-node@v6
+        with:
+          node-version: "22"
+          cache: pnpm
+          cache-dependency-path: "web/pnpm-lock.yaml"
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: echo "STORE_PATH=$(pnpm store path)" >> $GITHUB_OUTPUT
+      - name: Setup pnpm cache
+        uses: actions/cache@v5
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('web/pnpm-lock.yaml') }}
+          restore-keys: ${{ runner.os }}-pnpm-store-
+      - run: pnpm install --frozen-lockfile
+        working-directory: web
+      - name: Run frontend build
+        run: pnpm release
+        working-directory: web
+
+      - name: Upload frontend artifacts
+        uses: actions/upload-artifact@v6
+        with:
+          name: frontend-dist
+          path: server/router/frontend/dist
+          retention-days: 1
+
+  build-push:
+    needs: build-frontend
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Download frontend artifacts
+        uses: actions/download-artifact@v7
+        with:
+          name: frontend-dist
+          path: server/router/frontend/dist
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./scripts/Dockerfile
+          platforms: ${{ matrix.platform }}
+          cache-from: type=gha,scope=build-${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=build-${{ matrix.platform }}
+          outputs: type=image,name=neosmemo/memos,push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v6
+        with:
+          name: digests-${{ strategy.job-index }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    needs: build-push
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v7
+        with:
+          pattern: digests-*
+          merge-multiple: true
+          path: /tmp/digests
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            neosmemo/memos
+            ghcr.io/usememos/memos
+          flavor: |
+            latest=false
+          tags: |
+            type=raw,value=canary
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf 'neosmemo/memos@sha256:%s ' *)
+        env:
+          DOCKER_METADATA_OUTPUT_JSON: ${{ steps.meta.outputs.json }}
+
+      - name: Inspect images
+        run: |
+          docker buildx imagetools inspect neosmemo/memos:canary
+          docker buildx imagetools inspect ghcr.io/usememos/memos:canary

.github/workflows/build-stable-image.yml

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+name: Build Stable Image
+
+on:
+  push:
+    branches:
+      - "release/**"
+    tags:
+      - "v*.*.*"
+
+jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.version.outputs.version }}
+    steps:
+      - name: Extract version
+        id: version
+        run: |
+          if [[ "$GITHUB_REF_TYPE" == "tag" ]]; then
+            echo "version=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
+          else
+            echo "version=${GITHUB_REF_NAME#release/}" >> $GITHUB_OUTPUT
+          fi
+
+  build-frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: pnpm/action-setup@v4.2.0
+        with:
+          version: 10
+      - uses: actions/setup-node@v6
+        with:
+          node-version: "22"
+          cache: pnpm
+          cache-dependency-path: "web/pnpm-lock.yaml"
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: echo "STORE_PATH=$(pnpm store path)" >> $GITHUB_OUTPUT
+      - name: Setup pnpm cache
+        uses: actions/cache@v5
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('web/pnpm-lock.yaml') }}
+          restore-keys: ${{ runner.os }}-pnpm-store-
+      - run: pnpm install --frozen-lockfile
+        working-directory: web
+      - name: Run frontend build
+        run: pnpm release
+        working-directory: web
+
+      - name: Upload frontend artifacts
+        uses: actions/upload-artifact@v6
+        with:
+          name: frontend-dist
+          path: server/router/frontend/dist
+          retention-days: 1
+
+  build-push:
+    needs: [prepare, build-frontend]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm/v7
+          - linux/arm64
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Download frontend artifacts
+        uses: actions/download-artifact@v7
+        with:
+          name: frontend-dist
+          path: server/router/frontend/dist
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./scripts/Dockerfile
+          platforms: ${{ matrix.platform }}
+          cache-from: type=gha,scope=build-${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=build-${{ matrix.platform }}
+          outputs: type=image,name=neosmemo/memos,push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v6
+        with:
+          name: digests-${{ strategy.job-index }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  merge:
+    needs: [prepare, build-push]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v7
+        with:
+          pattern: digests-*
+          merge-multiple: true
+          path: /tmp/digests
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            neosmemo/memos
+            ghcr.io/usememos/memos
+          tags: |
+            type=semver,pattern={{version}},value=${{ needs.prepare.outputs.version }}
+            type=semver,pattern={{major}}.{{minor}},value=${{ needs.prepare.outputs.version }}
+            type=raw,value=stable
+          flavor: |
+            latest=false
+          labels: |
+            org.opencontainers.image.version=${{ needs.prepare.outputs.version }}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf 'neosmemo/memos@sha256:%s ' *)
+        env:
+          DOCKER_METADATA_OUTPUT_JSON: ${{ steps.meta.outputs.json }}
+
+      - name: Inspect images
+        run: |
+          docker buildx imagetools inspect neosmemo/memos:stable
+          docker buildx imagetools inspect ghcr.io/usememos/memos:stable

.github/workflows/demo-deploy.yml

@@ -0,0 +1,17 @@
+name: Demo Deploy
+
+on:
+  workflow_dispatch:
+
+jobs:
+  deploy-demo:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Render Deploy
+        run: |
+          curl -X POST "${{ secrets.RENDER_DEPLOY_HOOK }}" \
+            -H "Content-Type: application/json" \
+            -d '{"trigger": "github_action"}'
+
+      - name: Deployment Status
+        run: echo "Demo deployment triggered successfully on Render"

.github/workflows/frontend-tests.yml

@@ -0,0 +1,72 @@
+name: Frontend Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    paths:
+      - "web/**"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  NODE_VERSION: "22"
+  PNPM_VERSION: "10"
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4.2.0
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: pnpm
+          cache-dependency-path: web/pnpm-lock.yaml
+
+      - name: Install dependencies
+        working-directory: web
+        run: pnpm install --frozen-lockfile
+
+      - name: Run lint
+        working-directory: web
+        run: pnpm lint
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4.2.0
+        with:
+          version: ${{ env.PNPM_VERSION }}
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+          cache: pnpm
+          cache-dependency-path: web/pnpm-lock.yaml
+
+      - name: Install dependencies
+        working-directory: web
+        run: pnpm install --frozen-lockfile
+
+      - name: Build frontend
+        working-directory: web
+        run: pnpm build

.github/workflows/proto-linter.yml

@@ -0,0 +1,40 @@
+name: Proto Linter
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+    paths:
+      - "proto/**"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Lint Protos
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Setup buf
+        uses: bufbuild/buf-setup-action@v1
+        with:
+          github_token: ${{ github.token }}
+
+      - name: Run buf lint
+        uses: bufbuild/buf-lint-action@v1
+        with:
+          input: proto
+
+      - name: Check buf format
+        run: |
+          if [[ $(buf format -d) ]]; then
+            echo "❌ Proto files are not formatted. Run 'buf format -w' to fix."
+            exit 1
+          fi

.github/workflows/stale.yml

@@ -0,0 +1,24 @@
+name: Close Stale
+
+on:
+  schedule:
+    - cron: "0 */8 * * *" # Every 8 hours
+
+jobs:
+  close-stale:
+    name: Close Stale Issues and PRs
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Mark and close stale issues and PRs
+        uses: actions/stale@v10.1.1
+        with:
+          # Issues: mark stale after 14 days of inactivity, close after 3 more days
+          days-before-issue-stale: 14
+          days-before-issue-close: 3
+
+          # Pull requests: mark stale after 14 days of inactivity, close after 3 more days
+          days-before-pr-stale: 14
+          days-before-pr-close: 3

.gitignore

@@ -0,0 +1,29 @@
+# temp folder
+tmp
+
+# Frontend asset
+web/dist
+
+# Build artifacts
+build/
+bin/
+memos
+
+# Plan/design documents
+docs/plans/
+
+.DS_Store
+
+# Jetbrains
+.idea
+
+# Docker Compose Environment File
+.env
+
+dist
+
+# VSCode settings
+.vscode
+
+# Git worktrees
+.worktrees/

.golangci.yaml

@@ -0,0 +1,101 @@
+version: "2"
+
+linters:
+  enable:
+    - revive
+    - govet
+    - staticcheck
+    - misspell
+    - gocritic
+    - sqlclosecheck
+    - rowserrcheck
+    - nilerr
+    - godot
+    - forbidigo
+    - mirror
+    - bodyclose
+  disable:
+    - errcheck
+  settings:
+    exhaustive:
+      explicit-exhaustive-switch: false
+    staticcheck:
+      checks:
+        - all
+        - -ST1000
+        - -ST1003
+        - -ST1021
+        - -QF1003
+    revive:
+      # Default to run all linters so that new rules in the future could automatically be added to the static check.
+      enable-all-rules: true
+      rules:
+        # The following rules are too strict and make coding harder. We do not enable them for now.
+        - name: file-header
+          disabled: true
+        - name: line-length-limit
+          disabled: true
+        - name: function-length
+          disabled: true
+        - name: max-public-structs
+          disabled: true
+        - name: function-result-limit
+          disabled: true
+        - name: banned-characters
+          disabled: true
+        - name: argument-limit
+          disabled: true
+        - name: cognitive-complexity
+          disabled: true
+        - name: cyclomatic
+          disabled: true
+        - name: confusing-results
+          disabled: true
+        - name: add-constant
+          disabled: true
+        - name: flag-parameter
+          disabled: true
+        - name: nested-structs
+          disabled: true
+        - name: import-shadowing
+          disabled: true
+        - name: early-return
+          disabled: true
+        - name: use-any
+          disabled: true
+        - name: exported
+          disabled: true
+        - name: unhandled-error
+          disabled: true
+        - name: if-return
+          disabled: true
+        - name: max-control-nesting
+          disabled: true
+        - name: redefines-builtin-id
+          disabled: true
+        - name: package-comments
+          disabled: true
+    gocritic:
+      disabled-checks:
+        - ifElseChain
+    govet:
+      settings:
+        printf: # The name of the analyzer, run `go tool vet help` to see the list of all analyzers
+          funcs: # Run `go tool vet help printf` to see the full configuration of `printf`.
+            - common.Errorf
+      enable-all: true
+      disable:
+        - fieldalignment
+        - shadow
+    forbidigo:
+      forbid:
+        - pattern: 'fmt\.Errorf(# Please use errors\.Wrap\|Wrapf\|Errorf instead)?'
+        - pattern: 'ioutil\.ReadDir(# Please use os\.ReadDir)?'
+
+formatters:
+  enable:
+    - goimports
+  settings:
+    goimports:
+      local-prefixes:
+        - github.com/usememos/memos

AGENTS.md

@@ -0,0 +1,572 @@
+# Memos Codebase Guide for AI Agents
+
+This document provides comprehensive guidance for AI agents working with the Memos codebase. It covers architecture, workflows, conventions, and key patterns.
+
+## Project Overview
+
+Memos is a self-hosted knowledge management platform built with:
+- **Backend:** Go 1.25 with gRPC + Connect RPC
+- **Frontend:** React 18.3 + TypeScript + Vite 7
+- **Databases:** SQLite (default), MySQL, PostgreSQL
+- **Protocol:** Protocol Buffers (v2) with buf for code generation
+- **API Layer:** Dual protocol - Connect RPC (browsers) + gRPC-Gateway (REST)
+
+## Architecture
+
+### Backend Architecture
+
+```
+cmd/memos/              # Entry point
+└── main.go             # Cobra CLI, profile setup, server initialization
+
+server/
+├── server.go           # Echo HTTP server, healthz, background runners
+├── auth/               # Authentication (JWT, PAT, session)
+├── router/
+│   ├── api/v1/        # gRPC service implementations
+│   │   ├── v1.go      # Service registration, gateway & Connect setup
+│   │   ├── acl_config.go   # Public endpoints whitelist
+│   │   ├── connect_services.go  # Connect RPC handlers
+│   │   ├── connect_interceptors.go # Auth, logging, recovery
+│   │   └── *_service.go    # Individual services (memo, user, etc.)
+│   ├── frontend/       # Static file serving (SPA)
+│   ├── fileserver/     # Native HTTP file serving for media
+│   └── rss/           # RSS feed generation
+└── runner/
+    ├── memopayload/    # Memo payload processing (tags, links, tasks)
+    └── s3presign/     # S3 presigned URL management
+
+store/                  # Data layer with caching
+├── driver.go           # Driver interface (database operations)
+├── store.go           # Store wrapper with cache layer
+├── cache.go           # In-memory caching (instance settings, users)
+├── migrator.go        # Database migrations
+├── db/
+│   ├── db.go          # Driver factory
+│   ├── sqlite/        # SQLite implementation
+│   ├── mysql/         # MySQL implementation
+│   └── postgres/      # PostgreSQL implementation
+└── migration/         # SQL migration files (embedded)
+
+proto/                  # Protocol Buffer definitions
+├── api/v1/           # API v1 service definitions
+└── gen/               # Generated Go & TypeScript code
+```
+
+### Frontend Architecture
+
+```
+web/
+├── src/
+│   ├── components/     # React components
+│   ├── contexts/       # React Context (client state)
+│   │   ├── AuthContext.tsx      # Current user, auth state
+│   │   ├── ViewContext.tsx      # Layout, sort order
+│   │   └── MemoFilterContext.tsx # Filters, shortcuts
+│   ├── hooks/          # React Query hooks (server state)
+│   │   ├── useMemoQueries.ts    # Memo CRUD, pagination
+│   │   ├── useUserQueries.ts    # User operations
+│   │   ├── useAttachmentQueries.ts # Attachment operations
+│   │   └── ...
+│   ├── lib/            # Utilities
+│   │   ├── query-client.ts  # React Query v5 client
+│   │   └── connect.ts       # Connect RPC client setup
+│   ├── pages/          # Page components
+│   └── types/proto/    # Generated TypeScript from .proto
+├── package.json        # Dependencies
+└── vite.config.mts     # Vite config with dev proxy
+
+plugin/                 # Backend plugins
+├── scheduler/         # Cron jobs
+├── email/            # Email delivery
+├── filter/           # CEL filter expressions
+├── webhook/          # Webhook dispatch
+├── markdown/         # Markdown parsing & rendering
+├── httpgetter/        # HTTP fetching (metadata, images)
+└── storage/s3/       # S3 storage backend
+```
+
+## Key Architectural Patterns
+
+### 1. API Layer: Dual Protocol
+
+**Connect RPC (Browser Clients):**
+- Protocol: `connectrpc.com/connect`
+- Base path: `/memos.api.v1.*`
+- Interceptor chain: Metadata → Logging → Recovery → Auth
+- Returns type-safe responses to React frontend
+- See: `server/router/api/v1/connect_interceptors.go:177-227`
+
+**gRPC-Gateway (REST API):**
+- Protocol: Standard HTTP/JSON
+- Base path: `/api/v1/*`
+- Uses same service implementations as Connect
+- Useful for external tools, CLI clients
+- See: `server/router/api/v1/v1.go:52-96`
+
+**Authentication:**
+- JWT Access Tokens (V2): Stateless, 15-min expiration, verified via `AuthenticateByAccessTokenV2`
+- Personal Access Tokens (PAT): Stateful, long-lived, validated against database
+- Both use `Authorization: Bearer <token>` header
+- See: `server/auth/authenticator.go:17-166`
+
+### 2. Store Layer: Interface Pattern
+
+All database operations go through the `Driver` interface:
+```go
+type Driver interface {
+    GetDB() *sql.DB
+    Close() error
+
+    IsInitialized(ctx context.Context) (bool, error)
+
+    CreateMemo(ctx context.Context, create *Memo) (*Memo, error)
+    ListMemos(ctx context.Context, find *FindMemo) ([]*Memo, error)
+    UpdateMemo(ctx context.Context, update *UpdateMemo) error
+    DeleteMemo(ctx context.Context, delete *DeleteMemo) error
+
+    // ... similar methods for all resources
+}
+```
+
+**Three Implementations:**
+- `store/db/sqlite/` - SQLite (modernc.org/sqlite)
+- `store/db/mysql/` - MySQL (go-sql-driver/mysql)
+- `store/db/postgres/` - PostgreSQL (lib/pq)
+
+**Caching Strategy:**
+- Store wrapper maintains in-memory caches for:
+  - Instance settings (`instanceSettingCache`)
+  - Users (`userCache`)
+  - User settings (`userSettingCache`)
+- Config: Default TTL 10 min, cleanup interval 5 min, max 1000 items
+- See: `store/store.go:10-57`
+
+### 3. Frontend State Management
+
+**React Query v5 (Server State):**
+- All API calls go through custom hooks in `web/src/hooks/`
+- Query keys organized by resource: `memoKeys`, `userKeys`, `attachmentKeys`
+- Default staleTime: 30s, gcTime: 5min
+- Automatic refetch on window focus, reconnect
+- See: `web/src/lib/query-client.ts`
+
+**React Context (Client State):**
+- `AuthContext`: Current user, auth initialization, logout
+- `ViewContext`: Layout mode (LIST/MASONRY), sort order
+- `MemoFilterContext`: Active filters, shortcut selection, URL sync
+
+### 4. Database Migration System
+
+**Migration Flow:**
+1. `preMigrate`: Check if DB exists. If not, apply `LATEST.sql`
+2. `checkMinimumUpgradeVersion`: Reject pre-0.22 installations
+3. `applyMigrations`: Apply incremental migrations in single transaction
+4. Demo mode: Seed with demo data
+
+**Schema Versioning:**
+- Stored in `system_setting` table
+- Format: `major.minor.patch`
+- Migration files: `store/migration/{driver}/{version}/NN__description.sql`
+- See: `store/migrator.go:21-414`
+
+### 5. Protocol Buffer Code Generation
+
+**Definition Location:** `proto/api/v1/*.proto`
+
+**Regeneration:**
+```bash
+cd proto && buf generate
+```
+
+**Generated Outputs:**
+- Go: `proto/gen/api/v1/` (used by backend services)
+- TypeScript: `web/src/types/proto/api/v1/` (used by frontend)
+
+**Linting:** `proto/buf.yaml` - BASIC lint rules, FILE breaking changes
+
+## Development Commands
+
+### Backend
+
+```bash
+# Start dev server
+go run ./cmd/memos --port 8081
+
+# Run all tests
+go test ./...
+
+# Run tests for specific package
+go test ./store/...
+go test ./server/router/api/v1/test/...
+
+# Lint (golangci-lint)
+golangci-lint run
+
+# Format imports
+goimports -w .
+
+# Run with MySQL/Postgres
+DRIVER=mysql go run ./cmd/memos
+DRIVER=postgres go run ./cmd/memos
+```
+
+### Frontend
+
+```bash
+# Install dependencies
+cd web && pnpm install
+
+# Start dev server (proxies API to localhost:8081)
+pnpm dev
+
+# Type checking
+pnpm lint
+
+# Auto-fix lint issues
+pnpm lint:fix
+
+# Format code
+pnpm format
+
+# Build for production
+pnpm build
+
+# Build and copy to backend
+pnpm release
+```
+
+### Protocol Buffers
+
+```bash
+# Regenerate Go and TypeScript from .proto files
+cd proto && buf generate
+
+# Lint proto files
+cd proto && buf lint
+
+# Check for breaking changes
+cd proto && buf breaking --against .git#main
+```
+
+## Key Workflows
+
+### Adding a New API Endpoint
+
+1. **Define in Protocol Buffer:**
+   - Edit `proto/api/v1/*_service.proto`
+   - Add request/response messages
+   - Add RPC method to service
+
+2. **Regenerate Code:**
+   ```bash
+   cd proto && buf generate
+   ```
+
+3. **Implement Service (Backend):**
+   - Add method to `server/router/api/v1/*_service.go`
+   - Follow existing patterns: fetch user, validate, call store
+   - Add Connect wrapper to `server/router/api/v1/connect_services.go` (optional, same implementation)
+
+4. **If Public Endpoint:**
+   - Add to `server/router/api/v1/acl_config.go:11-34`
+
+5. **Create Frontend Hook (if needed):**
+   - Add query/mutation to `web/src/hooks/use*Queries.ts`
+   - Use existing query key factories
+
+### Database Schema Changes
+
+1. **Create Migration Files:**
+   ```
+   store/migration/sqlite/0.28/1__add_new_column.sql
+   store/migration/mysql/0.28/1__add_new_column.sql
+   store/migration/postgres/0.28/1__add_new_column.sql
+   ```
+
+2. **Update LATEST.sql:**
+   - Add change to `store/migration/{driver}/LATEST.sql`
+
+3. **Update Store Interface (if new table/model):**
+   - Add methods to `store/driver.go:8-71`
+   - Implement in `store/db/{driver}/*.go`
+
+4. **Test Migration:**
+   - Run `go test ./store/test/...` to verify
+
+### Adding a New Frontend Page
+
+1. **Create Page Component:**
+   - Add to `web/src/pages/NewPage.tsx`
+   - Use existing hooks for data fetching
+
+2. **Add Route:**
+   - Edit `web/src/App.tsx` (or router configuration)
+
+3. **Use React Query:**
+   ```typescript
+   import { useMemos } from "@/hooks/useMemoQueries";
+   const { data, isLoading } = useMemos({ filter: "..." });
+   ```
+
+4. **Use Context for Client State:**
+   ```typescript
+   import { useView } from "@/contexts/ViewContext";
+   const { layout, toggleSortOrder } = useView();
+   ```
+
+## Testing
+
+### Backend Tests
+
+**Test Pattern:**
+```go
+func TestMemoCreation(t *testing.T) {
+    ctx := context.Background()
+    store := test.NewTestingStore(ctx, t)
+
+    // Create test user
+    user, _ := createTestUser(ctx, store, t)
+
+    // Execute operation
+    memo, err := store.CreateMemo(ctx, &store.Memo{
+        CreatorID: user.ID,
+        Content:  "Test memo",
+        // ...
+    })
+    require.NoError(t, err)
+    assert.NotNil(t, memo)
+}
+```
+
+**Test Utilities:**
+- `store/test/store.go:22-35` - `NewTestingStore()` creates isolated DB
+- `store/test/store.go:37-77` - `resetTestingDB()` cleans tables
+- Test DB determined by `DRIVER` env var (default: sqlite)
+
+**Running Tests:**
+```bash
+# All tests
+go test ./...
+
+# Specific package
+go test ./store/...
+go test ./server/router/api/v1/test/...
+
+# With coverage
+go test -cover ./...
+```
+
+### Frontend Testing
+
+**TypeScript Checking:**
+```bash
+cd web && pnpm lint
+```
+
+**No Automated Tests:**
+- Frontend relies on TypeScript checking and manual validation
+- React Query DevTools available in dev mode (bottom-left)
+
+## Code Conventions
+
+### Go
+
+**Error Handling:**
+- Use `github.com/pkg/errors` for wrapping: `errors.Wrap(err, "context")`
+- Return structured gRPC errors: `status.Errorf(codes.NotFound, "message")`
+
+**Naming:**
+- Package names: lowercase, single word (e.g., `store`, `server`)
+- Interfaces: `Driver`, `Store`, `Service`
+- Methods: PascalCase for exported, camelCase for internal
+
+**Comments:**
+- Public exported functions must have comments (godot enforces)
+- Use `//` for single-line, `/* */` for multi-line
+
+**Imports:**
+- Grouped: stdlib, third-party, local
+- Sorted alphabetically within groups
+- Use `goimports -w .` to format
+
+### TypeScript/React
+
+**Components:**
+- Functional components with hooks
+- Use `useMemo`, `useCallback` for optimization
+- Props interfaces: `interface Props { ... }`
+
+**State Management:**
+- Server state: React Query hooks
+- Client state: React Context
+- Avoid direct useState for server data
+
+**Styling:**
+- Tailwind CSS v4 via `@tailwindcss/vite`
+- Use `clsx` and `tailwind-merge` for conditional classes
+
+**Imports:**
+- Absolute imports with `@/` alias
+- Group: React, third-party, local
+- Auto-organized by Biome
+
+## Important Files Reference
+
+### Backend Entry Points
+
+| File | Purpose |
+|------|---------|
+| `cmd/memos/main.go` | Server entry point, CLI setup |
+| `server/server.go` | Echo server initialization, background runners |
+| `store/store.go` | Store wrapper with caching |
+| `store/driver.go` | Database driver interface |
+
+### API Layer
+
+| File | Purpose |
+|------|---------|
+| `server/router/api/v1/v1.go` | Service registration, gateway setup |
+| `server/router/api/v1/acl_config.go` | Public endpoints whitelist |
+| `server/router/api/v1/connect_interceptors.go` | Connect interceptors |
+| `server/auth/authenticator.go` | Authentication logic |
+
+### Frontend Core
+
+| File | Purpose |
+|------|---------|
+| `web/src/lib/query-client.ts` | React Query client configuration |
+| `web/src/contexts/AuthContext.tsx` | User authentication state |
+| `web/src/contexts/ViewContext.tsx` | UI preferences |
+| `web/src/contexts/MemoFilterContext.tsx` | Filter state |
+| `web/src/hooks/useMemoQueries.ts` | Memo queries/mutations |
+
+### Data Layer
+
+| File | Purpose |
+|------|---------|
+| `store/memo.go` | Memo model definitions, store methods |
+| `store/user.go` | User model definitions |
+| `store/attachment.go` | Attachment model definitions |
+| `store/migrator.go` | Migration logic |
+| `store/db/db.go` | Driver factory |
+| `store/db/sqlite/sqlite.go` | SQLite driver implementation |
+
+## Configuration
+
+### Backend Environment Variables
+
+| Variable | Default | Description |
+|----------|----------|-------------|
+| `MEMOS_DEMO` | `false` | Enable demo mode |
+| `MEMOS_PORT` | `8081` | HTTP port |
+| `MEMOS_ADDR` | `` | Bind address (empty = all) |
+| `MEMOS_DATA` | `~/.memos` | Data directory |
+| `MEMOS_DRIVER` | `sqlite` | Database: `sqlite`, `mysql`, `postgres` |
+| `MEMOS_DSN` | `` | Database connection string |
+| `MEMOS_INSTANCE_URL` | `` | Instance base URL |
+
+### Frontend Environment Variables
+
+| Variable | Default | Description |
+|----------|----------|-------------|
+| `DEV_PROXY_SERVER` | `http://localhost:8081` | Backend proxy target |
+
+## CI/CD
+
+### GitHub Workflows
+
+**Backend Tests** (`.github/workflows/backend-tests.yml`):
+- Runs on `go.mod`, `go.sum`, `**.go` changes
+- Steps: verify `go mod tidy`, golangci-lint, all tests
+
+**Frontend Tests** (`.github/workflows/frontend-tests.yml`):
+- Runs on `web/**` changes
+- Steps: pnpm install, lint, build
+
+**Proto Lint** (`.github/workflows/proto-linter.yml`):
+- Runs on `.proto` changes
+- Steps: buf lint, buf breaking check
+
+### Linting Configuration
+
+**Go** (`.golangci.yaml`):
+- Linters: revive, govet, staticcheck, misspell, gocritic, etc.
+- Formatter: goimports
+- Forbidden: `fmt.Errorf`, `ioutil.ReadDir`
+
+**TypeScript** (`web/biome.json`):
+- Linting: Biome (ESLint replacement)
+- Formatting: Biome (Prettier replacement)
+- Line width: 140 characters
+- Semicolons: always
+
+## Common Tasks
+
+### Debugging API Issues
+
+1. Check Connect interceptor logs: `server/router/api/v1/connect_interceptors.go:79-105`
+2. Verify endpoint is in `acl_config.go` if public
+3. Check authentication via `auth/authenticator.go:133-165`
+4. Test with curl: `curl -H "Authorization: Bearer <token>" http://localhost:8081/api/v1/...`
+
+### Debugging Frontend State
+
+1. Open React Query DevTools (bottom-left in dev)
+2. Inspect query cache, mutations, refetch behavior
+3. Check Context state via React DevTools
+4. Verify filter state in MemoFilterContext
+
+### Running Tests Against Multiple Databases
+
+```bash
+# SQLite (default)
+DRIVER=sqlite go test ./...
+
+# MySQL (requires running MySQL server)
+DRIVER=mysql DSN="user:pass@tcp(localhost:3306)/memos" go test ./...
+
+# PostgreSQL (requires running PostgreSQL server)
+DRIVER=postgres DSN="postgres://user:pass@localhost:5432/memos" go test ./...
+```
+
+## Plugin System
+
+Backend supports pluggable components in `plugin/`:
+
+| Plugin | Purpose |
+|--------|----------|
+| `scheduler` | Cron-based job scheduling |
+| `email` | SMTP email delivery |
+| `filter` | CEL expression filtering |
+| `webhook` | HTTP webhook dispatch |
+| `markdown` | Markdown parsing (goldmark) |
+| `httpgetter` | HTTP content fetching |
+| `storage/s3` | S3-compatible storage |
+
+Each plugin has its own README with usage examples.
+
+## Performance Considerations
+
+### Backend
+
+- Database queries use pagination (`limit`, `offset`)
+- In-memory caching reduces DB hits for frequently accessed data
+- WAL journal mode for SQLite (reduces locking)
+- Thumbnail generation limited to 3 concurrent operations
+
+### Frontend
+
+- React Query reduces redundant API calls
+- Infinite queries for large lists (pagination)
+- Manual chunks: `utils-vendor`, `mermaid-vendor`, `leaflet-vendor`
+- Lazy loading for heavy components
+
+## Security Notes
+
+- JWT secrets must be kept secret (generated on first run in production mode)
+- Personal Access Tokens stored as SHA-256 hashes in database
+- CSRF protection via SameSite cookies
+- CORS enabled for all origins (configure for production)
+- Input validation at service layer
+- SQL injection prevention via parameterized queries

CODEOWNERS

@@ -0,0 +1,2 @@
+# These owners will be the default owners for everything in the repo.
+* @boojack @johnnyjoygh

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Memos
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -0,0 +1,111 @@
+# Memos
+
+<img align="right" height="96px" src="https://raw.githubusercontent.com/usememos/.github/refs/heads/main/assets/logo-rounded.png" alt="Memos" />
+
+An open-source, self-hosted note-taking service. Your thoughts, your data, your control — no tracking, no ads, no subscription fees.
+
+[![Home](https://img.shields.io/badge/🏠-usememos.com-blue?style=flat-square)](https://usememos.com)
+[![Live Demo](https://img.shields.io/badge/✨-Try%20Demo-orange?style=flat-square)](https://demo.usememos.com/)
+[![Docs](https://img.shields.io/badge/📚-Documentation-green?style=flat-square)](https://usememos.com/docs)
+[![Discord](https://img.shields.io/badge/💬-Discord-5865f2?style=flat-square&logo=discord&logoColor=white)](https://discord.gg/tfPJa4UmAv)
+[![Docker Pulls](https://img.shields.io/docker/pulls/neosmemo/memos?style=flat-square&logo=docker)](https://hub.docker.com/r/neosmemo/memos)
+
+<img src="https://raw.githubusercontent.com/usememos/.github/refs/heads/main/assets/demo.png" alt="Memos Demo Screenshot" height="512" />
+
+### 💎 Featured Sponsors
+
+[**Warp** — The AI-powered terminal built for speed and collaboration](https://go.warp.dev/memos)
+
+<a href="https://go.warp.dev/memos" target="_blank" rel="noopener">
+  <img src="https://raw.githubusercontent.com/warpdotdev/brand-assets/main/Github/Sponsor/Warp-Github-LG-02.png" alt="Warp - The AI-powered terminal built for speed and collaboration" width="512" />
+</a>
+
+<p></p>
+
+[**TestMu AI** - The world’s first full-stack Agentic AI Quality Engineering platform](https://www.testmuai.com/?utm_medium=sponsor&utm_source=memos)
+  
+<a href="https://www.testmuai.com/?utm_medium=sponsor&utm_source=memos" target="_blank" rel="noopener">
+  <img src="https://usememos.com/sponsors/testmu.svg" alt="TestMu AI" height="36" />
+</a>
+
+<p></p>
+
+[**SSD Nodes** - Affordable VPS hosting for self-hosters](https://ssdnodes.com/?utm_source=memos&utm_medium=sponsor)
+  
+<a href="https://ssdnodes.com/?utm_source=memos&utm_medium=sponsor" target="_blank" rel="noopener">
+  <img src="https://usememos.com/sponsors/ssd-nodes.svg" alt="SSD Nodes" height="72" />
+</a>
+
+## Overview
+
+Memos is a privacy-first, self-hosted knowledge base for personal notes, team wikis, and knowledge management. Built with Go and React, it runs as a single binary with minimal resource usage.
+
+## Features
+
+- **Privacy-First** — Self-hosted on your infrastructure with zero telemetry, no tracking, and no ads.
+- **Markdown Native** — Full markdown support with plain text storage. Your data is always portable.
+- **Lightweight** — Single Go binary with a React frontend. Low memory footprint, starts in seconds.
+- **Easy to Deploy** — One-line Docker install. Supports SQLite, MySQL, and PostgreSQL.
+- **Developer-Friendly** — Full REST and gRPC APIs for integration with existing workflows.
+- **Clean Interface** — Minimal design with dark mode and mobile-responsive layout.
+
+## Quick Start
+
+### Docker (Recommended)
+
+```bash
+docker run -d \
+  --name memos \
+  -p 5230:5230 \
+  -v ~/.memos:/var/opt/memos \
+  neosmemo/memos:stable
+```
+
+Open `http://localhost:5230` and start writing!
+
+### Try the Live Demo
+
+Don't want to install yet? Try our [live demo](https://demo.usememos.com/) first!
+
+### Other Installation Methods
+
+- **Docker Compose** - Recommended for production deployments
+- **Pre-built Binaries** - Available for Linux, macOS, and Windows
+- **Kubernetes** - Helm charts and manifests available
+- **Build from Source** - For development and customization
+
+See our [installation guide](https://usememos.com/docs/deploy) for detailed instructions.
+
+## Contributing
+
+Contributions are welcome — bug reports, feature suggestions, pull requests, documentation, and translations.
+
+- [Report bugs](https://github.com/usememos/memos/issues/new?template=bug_report.md)
+- [Suggest features](https://github.com/usememos/memos/issues/new?template=feature_request.md)
+- [Submit pull requests](https://github.com/usememos/memos/pulls)
+- [Improve documentation](https://github.com/usememos/dotcom)
+- [Help with translations](https://github.com/usememos/memos/tree/main/web/src/locales)
+
+## Sponsors
+
+Love Memos? [Sponsor us on GitHub](https://github.com/sponsors/usememos) to help keep the project growing!
+
+## Star History
+
+[![Star History Chart](https://api.star-history.com/svg?repos=usememos/memos&type=Date)](https://star-history.com/#usememos/memos&Date)
+
+## License
+
+Memos is open-source software licensed under the [MIT License](LICENSE).
+
+## Privacy Policy
+
+Memos is built with privacy as a core principle. As a self-hosted application, all your data stays on your infrastructure. There is no telemetry, no tracking, and no data collection. See our [Privacy Policy](https://usememos.com/privacy) for details.
+
+---
+
+**[Website](https://usememos.com)** • **[Documentation](https://usememos.com/docs)** • **[Demo](https://demo.usememos.com/)** • **[Discord](https://discord.gg/tfPJa4UmAv)** • **[X/Twitter](https://x.com/usememos)**
+
+<a href="https://vercel.com/oss">
+  <img alt="Vercel OSS Program" src="https://vercel.com/oss/program-badge.svg" />
+</a>

SECURITY.md

@@ -0,0 +1,46 @@
+# Security Policy
+
+## Project Status
+
+Memos is currently in beta (v0.x). While we take security seriously, we are not yet ready for formal CVE assignments or coordinated disclosure programs.
+
+## Reporting Security Issues
+
+### For All Security Concerns:
+Please report via **email only**: dev@usememos.com
+
+**DO NOT open public GitHub issues for security vulnerabilities.**
+
+Include in your report:
+- Description of the issue
+- Steps to reproduce
+- Affected versions
+- Your assessment of severity
+
+### What to Expect:
+- We will acknowledge your report as soon as we can
+- Fixes will be included in regular releases without special security advisories
+- No CVEs will be assigned during the beta phase
+- Credit will be given in release notes if you wish
+
+### For Non-Security Bugs:
+Use GitHub issues for functionality bugs, feature requests, and general questions.
+
+## Philosophy
+
+As a beta project, we prioritize:
+1. **Rapid iteration** over lengthy disclosure timelines
+2. **Quick patches** over formal security processes
+3. **Transparency** about our beta status
+
+We plan to implement formal vulnerability disclosure and CVE handling after reaching v1.0 stable.
+
+## Self-Hosting Security
+
+Since Memos is self-hosted software:
+- Keep your instance updated to the latest release
+- Don't expose your instance directly to the internet without authentication
+- Use reverse proxies (nginx, Caddy) with rate limiting
+- Review the deployment documentation for security best practices
+
+Thank you for helping improve Memos!

arms_cache/config/arms.converge.config.arms_agent.apm_1576452733059910.fit0dygksm_5deca4ebd39a6e7@@arms.convergence.config@@c845a7b4-23a1-4f28-a380-5ab30d8a280f

@@ -0,0 +1 @@
+{"id":3255,"version":1,"configs":{"raw_sql":{"pri":5,"over":true,"type":"unknown","enable":true,"converge":true,"before":{},"after":{},"lmtCfg":{"wnd":3600,"th":50,"globalLimit":200,"ignWhenFail":false,"limit":100,"type":"s_lmt","enable":true,"stopWhExclude":true},"monRAW":false,"monRS":false},"raw_slow_sql":{"pri":5,"over":true,"type":"unknown","enable":true,"converge":true,"before":{},"after":{},"lmtCfg":{"wnd":3600,"th":50,"globalLimit":200,"ignWhenFail":false,"limit":100,"type":"s_lmt","enable":true,"stopWhExclude":true},"monRAW":false,"monRS":false}},"appId":"fit0dygksm@5deca4ebd39a6e7","enable":true,"extraLabels":{}}

arms_cache/config/arms.trace.fit0dygksm-5deca4ebd39a6e7@@ap-southeast-1@@c845a7b4-23a1-4f28-a380-5ab30d8a280f

@@ -0,0 +1 @@
+{"otel":{"instrumentation":{"panic":{"enabled":true}}},"profiler":{"enable":true,"metrics":{"report":{"interval":15},"jvm":{"captureGcCause":false}},"quantile":{"enable":true},"exception":{"whitelist":"","filterByParentClass":false,"fromConstructor":{"enable":false},"fromInstrumentedMethod":{"enable":true},"advancedWhitelist":"[]","stacktrace":2},"SLS":{"regionId":"pub-cn-hangzhou-staging","bindType":"logstore","index":""},"compress":{"enable":false},"logging":{"injectTraceId2Log":{"enable":false},"injectSpanId2Log":{"enable":false},"enable":true},"agent":{"logger":{"level":"WARN"}},"thresholds":{"interface":500,"sql":500,"limit":1000},"error":{"skip":""},"param":{"maxLength":1024},"http":{"metrics":{"recordHttpCode":false}},"jdbc":{"tracesqlraw":false,"tracesqlbindvalue":false},"callsql":{"maxLength":1024},"threadpoolmonitor":{"enable":true},"cp":{"enable":true,"cpuEnable":true,"allocEnable":true,"wallClockEnable":false},"span":{"exporter":{"enable":true}},"sampling":{"rate":100,"useSamplingStrategyV2":false,"v2config":{"spanNames4FullSampleStr":"","spanNamePrefixes4FullSampleStr":"","spanNameSuffixes4FullSampleStr":""}},"trace":{"protocol":{"name":"W3C"}},"responseInject":{"enable":false},"defined":{"excludeurl":"SELECT,UPDATE,func cron,select"},"metricsAndSpan":{"entranceless":{"enable":false}},"dubbo":{"enable":true},"elasticsearch":{"enable":true},"grpc":{"enable":true},"liberty":{"enable":true},"mongodb":{"enable":true},"mysql":{"enable":true},"postgresql":{"enable":true},"redis":{"enable":true},"rabbitmq":{"client":{"enable":true}},"kafka":{"enable":true},"go":{"sampling":{"useSamplingStrategyV2":false,"rate":100,"v2config":{"spanNames4FullSampleStr":"","spanNamePrefixes4FullSampleStr":"","spanNameSuffixes4FullSampleStr":""}},"opentelemetry":{"enable":false},"opentracing":{"enable":false},"runtime":true,"cp":{"enable":true,"cpuEnable":true,"allocEnable":true,"wallClockEnable":false,"goroutineEnable":true,"blockEnable":false,"mutexEnable":false},"httpRequestBody":{"enable":false,"size":1024},"httpRequestHeader":{"enable":false,"key":""},"httpResponseBody":{"enable":false,"size":1024},"httpResponseHeader":{"enable":false,"key":""},"span":{"names":""},"exception":{"length":4096},"enable":true},"gin":{"enable":true},"kratos":{"enable":true},"fasthttp":{"enable":true},"restful":{"enable":false},"micro":{"enable":false},"iris":{"enable":true},"echo":{"enable":false},"mux":{"enable":false},"fiber":{"enable":true},"thrift":{"enable":true},"kitex":{"enable":true},"hertz":{"enable":true},"fc":{"enable":true},"gorm":{"enable":false},"k8sclient":{"enable":true},"nethttp":{"enable":true},"mcp":{"enable":true},"langchain":{"enable":true}}}

docapi.txt

@@ -0,0 +1,644 @@
+# Memos API Documentation
+
+## Overview
+Memos is a self-hosted knowledge management platform with a RESTful API built using Protocol Buffers and gRPC. The API supports both gRPC and HTTP/JSON protocols.
+
+## Base URL
+```
+http://localhost:8081
+```
+
+## Authentication
+Most API endpoints require authentication. Memos uses JWT-based authentication with short-lived access tokens.
+
+### Sign In
+```bash
+curl -X POST http://localhost:8081/api/v1/auth/signin \
+  -H "Content-Type: application/json" \
+  -d '{
+    "password_credentials": {
+      "username": "testuser",
+      "password": "password123"
+    }
+  }'
+
+# Alternative: Using email instead of username
+curl -X POST http://localhost:8081/api/v1/auth/signin \
+  -H "Content-Type: application/json" \
+  -d '{
+    "password_credentials": {
+      "username": "test@example.com",
+      "password": "password123"
+    }
+  }' \
+  -H "Content-Type: application/json" \
+  -d '{
+    "password_credentials": {
+      "username": "testuser",
+      "password": "password123"
+    }
+  }'
+```
+
+**Response:**
+```json
+{
+  "user": {
+    "name": "users/1",
+    "role": "ADMIN",
+    "username": "testuser",
+    "email": "test@example.com",
+    "displayName": "",
+    "avatarUrl": "",
+    "description": "",
+    "state": "NORMAL",
+    "createTime": "2026-03-03T13:03:20Z",
+    "updateTime": "2026-03-03T13:03:20Z"
+  },
+  "accessToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
+  "accessTokenExpiresAt": "2026-03-03T13:20:35.055464409Z"
+}```
+```
+
+### Using Authentication Token
+Include the access token in the Authorization header:
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/users
+
+# Example with actual token
+curl -H "Authorization: Bearer eyJhbGciOiJIUzI1NiIsImtpZCI6InYxIiwidHlwIjoiSldUIn0.eyJ0eXBlIjoiYWNjZXNzIiwicm9sZSI6IkFETUlOIiwic3RhdHVzIjoiTk9STUFMIiwidXNlcm5hbWUiOiJ0ZXN0dXNlciIsImlzcyI6Im1lbW9zIiwic3ViIjoiMSIsImF1ZCI6WyJ1c2VyLmFjY2Vzcy10b2tlbiJdLCJleHAiOjE3NzI1NDQwMzUsImlhdCI6MTc3MjU0MzEzNX0.5_xmduN3aiQ1vfMfEbKnBIzoFZc2ORy_ZiMgJLOamEc" \
+  http://localhost:8081/api/v1/users
+```
+
+## User Management
+
+### Create User
+```bash
+curl -X POST http://localhost:8081/api/v1/users \
+  -H "Content-Type: application/json" \
+  -d '{
+    "user": {
+      "username": "newuser",
+      "email": "newuser@example.com",
+      "password": "securepassword",
+      "role": "USER"
+    }
+  }'
+```
+
+### List Users
+```bash
+# Requires authentication
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/users
+
+# Example response:
+{
+  "users": [
+    {
+      "name": "users/1",
+      "role": "ADMIN",
+      "username": "testuser",
+      "email": "test@example.com",
+      "displayName": "",
+      "avatarUrl": "",
+      "description": "",
+      "state": "NORMAL",
+      "createTime": "2026-03-03T13:03:20Z",
+      "updateTime": "2026-03-03T13:03:20Z"
+    }
+  ],
+  "nextPageToken": "",
+  "totalSize": 1
+}
+```
+
+### Get User
+```bash
+# By ID
+curl http://localhost:8081/api/v1/users/1
+
+# By username
+curl http://localhost:8081/api/v1/users/newuser
+```
+
+### Update User
+```bash
+curl -X PATCH http://localhost:8081/api/v1/users/1 \
+  -H "Content-Type: application/json" \
+  -d '{
+    "user": {
+      "name": "users/1",
+      "display_name": "New Display Name"
+    },
+    "update_mask": "display_name"
+  }'
+```
+
+### Delete User
+```bash
+curl -X DELETE http://localhost:8081/api/v1/users/1
+```
+
+## Memo Management
+
+### Create Memo
+```bash
+curl -X POST http://localhost:8081/api/v1/memos \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "memo": {
+      "content": "# My First Memo\n\nThis is a sample memo with **markdown** formatting.",
+      "visibility": "PRIVATE"
+    }
+  }'
+
+# Example with actual token
+curl -X POST http://localhost:8081/api/v1/memos \
+  -H "Authorization: Bearer eyJhbGciOiJIUzI1NiIsImtpZCI6InYxIiwidHlwIjoiSldUIn0.eyJ0eXBlIjoiYWNjZXNzIiwicm9sZSI6IkFETUlOIiwic3RhdHVzIjoiTk9STUFMIiwidXNlcm5hbWUiOiJ0ZXN0dXNlciIsImlzcyI6Im1lbW9zIiwic3ViIjoiMSIsImF1ZCI6WyJ1c2VyLmFjY2Vzcy10b2tlbiJdLCJleHAiOjE3NzI1NDQwMzUsImlhdCI6MTc3MjU0MzEzNX0.5_xmduN3aiQ1vfMfEbKnBIzoFZc2ORy_ZiMgJLOamEc" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "memo": {
+      "content": "# Welcome to Memos\n\nThis is my first memo created via API! 🚀\n\n## Features\n- Markdown support\n- Easy organization\n- Fast search",
+      "visibility": "PRIVATE"
+    }
+  }'
+```
+
+### List Memos
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  "http://localhost:8081/api/v1/memos?page_size=10"
+```
+
+### Get Memo
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/memos/1
+```
+
+### Update Memo
+```bash
+curl -X PATCH http://localhost:8081/api/v1/memos/1 \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "memo": {
+      "name": "memos/1",
+      "content": "Updated content"
+    },
+    "update_mask": "content"
+  }'
+```
+
+### Delete Memo
+```bash
+curl -X DELETE http://localhost:8081/api/v1/memos/1 \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
+```
+
+## Memo Comments
+
+### Create Comment
+```bash
+curl -X POST http://localhost:8081/api/v1/memos/1/comments \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "comment": {
+      "content": "This is a comment on the memo"
+    }
+  }'
+```
+
+### List Comments
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/memos/1/comments
+```
+
+## Memo Reactions
+
+### Add Reaction
+```bash
+curl -X POST http://localhost:8081/api/v1/memos/1/reactions \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "reaction_type": "HEART"
+  }'
+```
+
+### List Reactions
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/memos/1/reactions
+```
+
+## Attachments
+
+### Upload Attachment
+First, upload the file:
+```bash
+curl -X POST http://localhost:8081/api/v1/attachments \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -F "file=@/path/to/your/file.jpg" \
+  -F "type=image/jpeg"
+```
+
+### List Attachments
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/attachments
+```
+
+## Identity Providers (SSO)
+
+### List Identity Providers
+```bash
+curl http://localhost:8081/api/v1/identity-providers
+```
+
+### Create Identity Provider
+```bash
+curl -X POST http://localhost:8081/api/v1/identity-providers \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "identity_provider": {
+      "name": "identity-providers/1",
+      "type": "OAUTH2",
+      "identifier_filter": ".*@company.com",
+      "oauth2_config": {
+        "client_id": "your-client-id",
+        "client_secret": "your-client-secret",
+        "auth_url": "https://accounts.google.com/o/oauth2/auth",
+        "token_url": "https://oauth2.googleapis.com/token",
+        "user_info_url": "https://www.googleapis.com/oauth2/v2/userinfo",
+        "scopes": ["openid", "email", "profile"]
+      }
+    }
+  }'
+```
+
+## Instance Management
+
+### Get Instance Info
+```bash
+curl http://localhost:8081/api/v1/instances
+```
+
+### Update Instance Settings
+```bash
+curl -X PATCH http://localhost:8081/api/v1/instances/default \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "instance": {
+      "name": "instances/default",
+      "custom_style": "body { font-family: Arial, sans-serif; }"
+    },
+    "update_mask": "custom_style"
+  }'
+```
+
+## User Settings
+
+### Get User Settings
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/users/1/settings
+```
+
+### Update User Settings
+```bash
+curl -X PATCH http://localhost:8081/api/v1/users/1/settings/GENERAL \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "setting": {
+      "name": "users/1/settings/GENERAL",
+      "general_setting": {
+        "locale": "en-US",
+        "theme": "dark",
+        "memo_visibility": "PRIVATE"
+      }
+    },
+    "update_mask": "general_setting"
+  }'
+```
+
+## Personal Access Tokens
+
+### Create PAT
+```bash
+curl -X POST http://localhost:8081/api/v1/users/1/personalAccessTokens \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "description": "API access for automation",
+    "expires_in_days": 30
+  }'
+```
+
+### List PATs
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/users/1/personalAccessTokens
+```
+
+### Delete PAT
+```bash
+curl -X DELETE http://localhost:8081/api/v1/users/1/personalAccessTokens/TOKEN_ID \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"
+```
+
+## Webhooks
+
+### Create User Webhook
+```bash
+curl -X POST http://localhost:8081/api/v1/users/1/webhooks \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "webhook": {
+      "url": "https://your-webhook-endpoint.com/memos",
+      "display_name": "Memo Notifications"
+    }
+  }'
+```
+
+### List Webhooks
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/users/1/webhooks
+```
+
+## Activities
+
+### List Activities
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/activities
+```
+
+## Shortcuts
+
+### Create Shortcut
+```bash
+curl -X POST http://localhost:8081/api/v1/shortcuts \
+  -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "shortcut": {
+      "title": "Quick Meeting Notes",
+      "payload": "# Meeting Notes\n\n## Attendees\n\n## Agenda\n\n## Action Items"
+    }
+  }'
+```
+
+### List Shortcuts
+```bash
+curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
+  http://localhost:8081/api/v1/shortcuts
+```
+
+## Utility Endpoints
+
+### Health Check
+```bash
+curl http://localhost:8081/healthz
+```
+
+**Response:** `Service ready.`
+
+### CPU Monitoring (Demo Mode)
+```bash
+curl http://localhost:8081/debug/cpu
+```
+
+## Error Responses
+
+API errors follow gRPC status codes:
+- `5` - Not Found
+- `16` - Unauthenticated
+- `3` - Invalid Argument
+- `7` - Permission Denied
+
+**Error Format:**
+```json
+{
+  "code": 16,
+  "message": "user not authenticated",
+  "details": []
+}
+```
+
+## Common Fields
+
+### User Roles
+- `ADMIN` - Administrator with full access
+- `USER` - Regular user with limited access
+
+### Memo Visibility
+- `PRIVATE` - Only creator can see
+- `PROTECTED` - Logged-in users can see
+- `PUBLIC` - Anyone can see
+
+### Memo States
+- `NORMAL` - Active memo
+- `ARCHIVED` - Archived memo
+
+## Pagination
+
+List endpoints support pagination:
+- `page_size` - Number of items per page (default: 50, max: 1000)
+- `page_token` - Token for next page
+
+Example:
+```bash
+curl "http://localhost:8081/api/v1/memos?page_size=20&page_token=NEXT_PAGE_TOKEN"
+```
+
+## Filtering
+
+Some endpoints support filtering:
+```bash
+curl "http://localhost:8081/api/v1/users?filter=username=='john'"
+```
+
+## Field Masks
+
+Use field masks to specify which fields to update:
+```bash
+curl -X PATCH http://localhost:8081/api/v1/users/1 \
+  -H "Content-Type: application/json" \
+  -d '{
+    "user": {
+      "name": "users/1",
+      "display_name": "John Doe",
+      "description": "Software Engineer"
+    },
+    "update_mask": "display_name,description"
+  }'
+```
+
+## Rate Limiting
+
+The API may implement rate limiting. Check response headers for:
+- `X-RateLimit-Limit` - Maximum requests per time window
+- `X-RateLimit-Remaining` - Remaining requests
+- `X-RateLimit-Reset` - Time when limit resets
+
+## CORS Support
+
+The API supports Cross-Origin Resource Sharing for web applications.
+
+## WebSocket Support
+
+Some real-time features may use WebSocket connections.
+
+## Versioning
+
+API version is included in the URL path: `/api/v1/`
+
+## Timestamps
+
+All timestamps are in RFC 3339 format: `2026-03-03T13:03:20Z`
+
+## Content Types
+
+- Request: `application/json`
+- Response: `application/json`
+- File uploads: `multipart/form-data`
+
+## Security Considerations
+
+1. Always use HTTPS in production
+2. Store access tokens securely (not in localStorage)
+3. Implement proper token refresh mechanisms
+4. Validate all input data
+5. Use appropriate CORS headers
+6. Implement rate limiting
+7. Sanitize user-generated content
+
+## Example API Workflow
+
+Here's a complete workflow showing how to use the API:
+
+1. **Create a user** (if not already done):
+```bash
+curl -X POST http://localhost:8081/api/v1/users \
+  -H "Content-Type: application/json" \
+  -d '{
+    "user": {
+      "username": "newuser",
+      "email": "newuser@example.com",
+      "password": "securepassword",
+      "role": "USER"
+    }
+  }'
+```
+
+2. **Sign in to get authentication token**:
+```bash
+curl -X POST http://localhost:8081/api/v1/auth/signin \
+  -H "Content-Type: application/json" \
+  -d '{
+    "password_credentials": {
+      "username": "newuser",
+      "password": "securepassword"
+    }
+  }'
+```
+
+3. **Use the token for subsequent requests**:
+```bash
+# Store the token from step 2
+TOKEN="your-access-token-here"
+
+# Create a memo
+curl -X POST http://localhost:8081/api/v1/memos \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "memo": {
+      "content": "# My Daily Notes\n\n## Today's Tasks\n- [ ] Review PRs\n- [ ] Update documentation\n- [ ] Team meeting at 2 PM",
+      "visibility": "PRIVATE"
+    }
+  }'
+
+# List all memos
+curl -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8081/api/v1/memos?page_size=20"
+```
+
+## Troubleshooting
+
+**Common Issues:**
+
+1. **401 Unauthorized**: Check that your access token is valid and not expired
+2. **404 Not Found**: Verify the endpoint URL and resource ID
+3. **400 Bad Request**: Check request format and required fields
+4. **500 Internal Server Error**: Server-side issue, check server logs
+
+**Debugging Tips:**
+
+- Use `-v` flag with curl for verbose output
+- Check server logs for detailed error information
+- Verify authentication token is properly formatted
+- Ensure Content-Type header is set correctly
+
+## API Testing Results
+
+**Successfully Tested Endpoints:**
+
+✅ **Public Endpoints:**
+- `GET /api/v1/memos` - Returns empty list when no memos exist
+
+✅ **Authentication:**
+- `POST /api/v1/auth/signin` - Successfully authenticated with username/password
+- `POST /api/v1/auth/signout` - Successfully logged out
+
+✅ **Protected Endpoints (require auth):**
+- `GET /api/v1/users` - Returns user list
+- `GET /api/v1/auth/me` - Returns current user info
+- `POST /api/v1/memos` - Successfully created memo with Markdown content
+- `GET /api/v1/memos` - Lists all memos (shows 2 memos after creation)
+
+⚠️ **Restricted Endpoints:**
+- `POST /api/v1/users` - User registration disabled (admin only)
+
+**Test Credentials:**
+- Username: `testuser`
+- Password: `password123`
+- Role: `ADMIN`
+- Token expires: ~1 hour
+
+**Sample Memo Created:**
+```markdown
+# Hello World
+
+This is my first memo from API testing!
+
+- Item 1
+- Item 2
+- Item 3
+
+**Bold text** and *italic text*
+```
+
+**Authentication Flow Tested:**
+1. Sign in → Receive JWT token
+2. Use token for authenticated requests
+3. Access protected endpoints successfully
+4. Sign out → Token invalidated
+
+## Additional Resources
+
+- [Protocol Buffers Documentation](https://developers.google.com/protocol-buffers)
+- [gRPC Gateway Documentation](https://grpc-ecosystem.github.io/grpc-gateway/)
+- [Memos GitHub Repository](https://github.com/usememos/memos)
+- [Memos Official Documentation](https://usememos.com/docs)

frontend.txt

@@ -0,0 +1,658 @@
+# Memos Frontend Documentation
+
+## Authentication and Middleware System
+
+### Frontend Authentication Architecture
+
+The frontend authentication system uses a combination of:
+
+1. **React Context** for state management
+2. **Route-based guards** for access control
+3. **Connect RPC interceptors** for API authentication
+4. **Layout-based protection** for UI components
+
+### Core Authentication Components
+
+#### 1. Auth Context (`web/src/contexts/AuthContext.tsx`)
+
+```typescript
+// Manages global authentication state
+const AuthContext = createContext<AuthContextType>({
+  currentUser: undefined,
+  userGeneralSetting: undefined,
+  isInitialized: false,
+  isLoading: true,
+  initialize: async () => {},
+  logout: () => {},
+  refetchSettings: async () => {}
+});
+
+// Provides authentication state to entire app
+function AuthProvider({ children }: { children: React.ReactNode }) {
+  // Handles token initialization, user fetching, logout logic
+}
+```
+
+#### 2. Route Protection System
+
+**Public Routes** (no auth required):
+
+- `/auth` - Authentication pages
+- `/auth/signup` - User registration
+- `/auth/callback` - OAuth callback
+- `/explore` - Public explore page
+- `/u/:username` - User profiles
+- `/memos/:uid` - Individual memo details
+
+**Private Routes** (auth required):
+
+- `/` (root) - Main dashboard
+- `/attachments` - File attachments
+- `/inbox` - Notifications
+- `/archived` - Archived memos
+- `/setting` - User settings
+
+#### 3. Layout-Based Authentication Guards
+
+**RootLayout** (`web/src/layouts/RootLayout.tsx`):
+
+```typescript
+const RootLayout = () => {
+  const currentUser = useCurrentUser();
+  
+  useEffect(() => {
+    if (!currentUser) {
+      redirectOnAuthFailure(); // Redirects to /auth
+    }
+  }, [currentUser]);
+  
+  // Renders navigation and main content
+  return (
+    <div className="w-full min-h-full flex flex-row">
+      <Navigation />
+      <main>
+        <Outlet />
+      </main>
+    </div>
+  );
+};
+```
+
+**Route Configuration** (`web/src/router/index.tsx`):
+
+```typescript
+const router = createBrowserRouter([
+  {
+    path: "/",
+    element: <App />, // Handles instance initialization
+    children: [
+      {
+        path: "/auth", // Public routes
+        children: [
+          { path: "", element: <SignIn /> },
+          { path: "signup", element: <SignUp /> },
+          { path: "callback", element: <AuthCallback /> }
+        ]
+      },
+      {
+        path: "/", // Protected routes (wrapped in RootLayout)
+        element: <RootLayout />, // Auth guard here
+        children: [
+          {
+            element: <MainLayout />, // Main app layout
+            children: [
+              { path: "", element: <Home /> },
+              { path: "explore", element: <Explore /> }
+              // ... other protected routes
+            ]
+          }
+        ]
+      }
+    ]
+  }
+]);
+```
+
+### API Authentication Interceptors
+
+#### Connect RPC Interceptor (`web/src/connect.ts`):
+
+```typescript
+const authInterceptor: Interceptor = (next) => async (req) => {
+  const isRetryAttempt = req.header.get(RETRY_HEADER) === RETRY_HEADER_VALUE;
+  const token = await getRequestToken();
+  setAuthorizationHeader(req, token);
+
+  try {
+    return await next(req);
+  } catch (error) {
+    // Handle 401 Unauthorized
+    if (error.code === Code.Unauthenticated && !isRetryAttempt) {
+      try {
+        // Attempt token refresh
+        const newToken = await refreshAndGetAccessToken();
+        setAuthorizationHeader(req, newToken);
+        req.header.set(RETRY_HEADER, RETRY_HEADER_VALUE);
+        return await next(req);
+      } catch (refreshError) {
+        redirectOnAuthFailure(); // Redirect to login
+        throw refreshError;
+      }
+    }
+    throw error;
+  }
+};
+```
+
+#### Token Management
+
+- **Storage**: Access tokens stored in memory (not localStorage)
+- **Refresh**: Automatic token refresh on 401 errors
+- **Expiration**: Proactive refresh on tab focus
+- **Cleanup**: Tokens cleared on logout/auth failure
+
+### Authentication Flow
+
+#### 1. App Initialization (`web/src/main.tsx`)
+
+```typescript
+// Early theme/locale setup to prevent flash
+applyThemeEarly();
+applyLocaleEarly();
+
+// Initialize auth and instance contexts
+<AuthProvider>
+  <InstanceProvider>
+    <RouterProvider router={router} />
+  </InstanceProvider>
+</AuthProvider>
+```
+
+#### 2. Authentication Check (`web/src/utils/auth-redirect.ts`)
+
+```typescript
+export function redirectOnAuthFailure(): void {
+  const currentPath = window.location.pathname;
+  
+  // Allow public routes
+  if (isPublicRoute(currentPath)) return;
+  
+  // Redirect private routes to auth
+  if (isPrivateRoute(currentPath)) {
+    clearAccessToken();
+    window.location.replace(ROUTES.AUTH);
+  }
+}
+```
+
+#### 3. User Session Management
+
+- Token refresh on window focus
+- Automatic logout on token expiration
+- Context cleanup on logout
+- Query cache invalidation
+
+### Key Security Features
+
+- **Token Storage**: In-memory only (security best practice)
+- **Automatic Refresh**: Handles token rotation seamlessly
+- **Route Guards**: Prevent unauthorized access to protected routes
+- **Context Isolation**: Auth state managed centrally
+- **Error Handling**: Graceful degradation on auth failures
+- **Session Cleanup**: Complete state reset on logout
+
+### Related Files
+
+- `web/src/contexts/AuthContext.tsx` - Authentication state management
+- `web/src/layouts/RootLayout.tsx` - Main authentication guard
+- `web/src/utils/auth-redirect.ts` - Route protection logic
+- `web/src/connect.ts` - API authentication interceptors
+- `web/src/router/index.tsx` - Route configuration
+- `web/src/main.tsx` - App initialization
+
+## Theme System Implementation
+
+### Vite Build Process for Themes
+
+The CSS themes are processed and built by **Vite** during the build process:
+
+1. **Vite Configuration** (`web/vite.config.mts`)
+   - Uses `@tailwindcss/vite` plugin for CSS processing
+   - Tailwind CSS v4 handles theme token compilation
+   - Themes are bundled during `pnpm build` process
+
+2. **CSS Processing Pipeline**
+   - Base styles imported in `web/src/index.css`
+   - Theme-specific CSS files located in `web/src/themes/`
+   - Vite processes `@theme inline` directives at build time
+   - Dynamic theme switching handled via JavaScript at runtime
+
+### Theme Architecture
+
+#### Core Theme Files
+
+- `web/src/index.css` - Main CSS entry point
+- `web/src/themes/default.css` - Base theme with Tailwind token mappings
+- `web/src/themes/default-dark.css` - Dark theme variables
+- `web/src/themes/paper.css` - Paper-style theme
+- `web/src/utils/theme.ts` - Theme loading and management logic
+
+#### How Themes Are Built
+
+##### 1. Build Time Processing (Vite + Tailwind)
+
+```css
+/* In web/src/themes/default.css */
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  /* ... other CSS variables */
+}
+```
+
+- Tailwind compiles these into static CSS classes
+- Shared across all themes
+- Optimized during Vite build process
+
+##### 2. Runtime Theme Switching
+
+- JavaScript dynamically injects theme CSS
+- Uses `?raw` import to get CSS as string
+- Injects `<style>` elements into document head
+- Controlled by `web/src/utils/theme.ts`
+
+### Theme Loading Mechanism
+
+In `web/src/utils/theme.ts`:
+
+```typescript
+import defaultDarkThemeContent from "../themes/default-dark.css?raw";
+import paperThemeContent from "../themes/paper.css?raw";
+
+const THEME_CONTENT: Record<ResolvedTheme, string | null> = {
+  default: null,           // Uses base CSS
+  "default-dark": defaultDarkThemeContent,
+  paper: paperThemeContent,
+};
+
+// Dynamically injects theme CSS
+const injectThemeStyle = (theme: ResolvedTheme): void => {
+  if (theme === "default") return; // Use base CSS
+  
+  const css = THEME_CONTENT[theme];
+  if (css) {
+    const style = document.createElement("style");
+    style.id = "instance-theme";
+    style.textContent = css;
+    document.head.appendChild(style);
+  }
+};
+```
+
+### Available Themes
+
+1. **System** (`system`) - Follows OS preference
+2. **Light** (`default`) - Default light theme
+3. **Dark** (`default-dark`) - Dark mode theme
+4. **Paper** (`paper`) - Paper-style theme
+
+### Theme Selection Components
+
+- `web/src/components/ThemeSelect.tsx` - Theme dropdown selector
+- `web/src/pages/UserSetting.tsx` - User profile theme settings
+- `web/src/contexts/InstanceContext.tsx` - Instance-wide theme defaults
+
+### Build Process Commands
+
+```bash
+# Development
+pnpm dev
+
+# Production build (processes themes)
+pnpm build
+
+# The build process:
+# 1. Vite processes Tailwind CSS
+# 2. Theme CSS files are bundled
+# 3. Dynamic theme loading code is included
+# 4. Output goes to dist/ directory
+```
+
+### Key Technical Details
+
+- **CSS-in-JS Approach**: Themes are injected as `<style>` elements
+- **Tree Shaking**: Unused theme CSS is removed during build
+- **Hot Reloading**: Theme changes reflect instantly in development
+- **Performance**: Theme switching is instant (no page reload)
+- **Storage**: Theme preference stored in localStorage
+- **Fallback**: Defaults to "system" theme if none selected
+
+The theme system leverages Vite's build optimization while maintaining runtime flexibility for dynamic theme switching.
+
+## Menu and Navigation System
+
+### Navigation Component Architecture
+
+The menu/navigation system is implemented through the `Navigation` component which serves as the main sidebar navigation.
+
+### Core Navigation Component (`web/src/components/Navigation.tsx`)
+
+```typescript
+interface NavLinkItem {
+  id: string;
+  path: string;
+  title: string;
+  icon: React.ReactNode;
+}
+
+const Navigation = (props: { collapsed?: boolean; className?: string }) => {
+  const currentUser = useCurrentUser();
+  const { data: notifications = [] } = useNotifications();
+  
+  // Navigation items are defined as objects
+  const homeNavLink: NavLinkItem = {
+    id: "header-memos",
+    path: Routes.ROOT,
+    title: t("common.memos"),
+    icon: <LibraryIcon className="w-6 h-auto shrink-0" />
+  };
+  
+  // Conditional navigation based on authentication state
+  const navLinks: NavLinkItem[] = currentUser
+    ? [homeNavLink, exploreNavLink, attachmentsNavLink, inboxNavLink]
+    : [exploreNavLink, signInNavLink];
+}
+```
+
+### Menu Items Configuration
+
+#### For Authenticated Users
+
+1. **Home** (`/`) - Main memos dashboard
+   - Icon: `LibraryIcon`
+   - Shows user's memos
+
+2. **Explore** (`/explore`) - Public memos exploration
+   - Icon: `EarthIcon`
+   - Browse public content
+
+3. **Attachments** (`/attachments`) - File management
+   - Icon: `PaperclipIcon`
+   - Manage uploaded files
+
+4. **Inbox** (`/inbox`) - Notifications
+   - Icon: `BellIcon` with badge
+   - Shows unread notification count
+
+#### For Unauthenticated Users
+
+1. **Explore** (`/explore`) - Public content browsing
+2. **Sign In** (`/auth`) - Authentication page
+   - Icon: `UserCircleIcon`
+
+### Navigation Layout Structure
+
+#### Desktop (>768px)
+
+- Fixed sidebar on left (`w-16` when collapsed, wider when expanded)
+- `RootLayout` renders `Navigation` component vertically
+- Collapsed state shows icons only with tooltips
+- Expanded state shows icons + text labels
+
+#### Mobile (<768px)
+
+- `NavigationDrawer` component in mobile header
+- Slide-out drawer from left side
+- Full-width navigation when opened
+
+### Navigation Implementation
+
+```typescript
+// In RootLayout.tsx
+{sm && (
+  <div className="fixed top-0 left-0 h-full w-16">
+    <Navigation className="py-4" collapsed={true} />
+  </div>
+)}
+
+// In MobileHeader.tsx
+<NavigationDrawer /> // For mobile devices
+```
+
+### Key Features
+
+#### 1. Conditional Rendering
+
+- Different menus for authenticated vs unauthenticated users
+- Notification badges for unread messages
+- Responsive design for mobile/desktop
+
+#### 2. Active State Management
+
+```typescript
+<NavLink
+  className={({ isActive }) =>
+    cn(
+      "px-2 py-2 rounded-2xl border flex flex-row",
+      isActive
+        ? "bg-sidebar-accent text-sidebar-accent-foreground"
+        : "border-transparent hover:bg-sidebar-accent"
+    )
+  }
+  to={navLink.path}
+>
+```
+
+#### 3. Collapsed State
+
+- Icons only with tooltip hints
+- Space-efficient for narrow screens
+- Smooth transitions
+
+#### 4. User Menu Integration
+
+- Bottom section shows `UserMenu` component
+- Profile/avatar display
+- Settings and logout options
+
+### Related Components
+
+- `web/src/components/Navigation.tsx` - Main navigation logic
+- `web/src/components/NavigationDrawer.tsx` - Mobile drawer implementation
+- `web/src/components/UserMenu.tsx` - User profile dropdown
+- `web/src/layouts/RootLayout.tsx` - Desktop layout with sidebar
+- `web/src/components/MobileHeader.tsx` - Mobile header with drawer
+
+### Internationalization
+
+- Menu titles translated via `useTranslate()` hook
+- Supports multiple languages
+- Dynamic text based on user locale
+
+The navigation system provides a clean, responsive menu that adapts to user authentication state and screen size while maintaining consistent UX across devices.
+
+## Layout System (Masonry vs List)
+
+### View Context Architecture
+
+The layout system is managed through the `ViewContext` which provides global state management for layout preferences and sorting options.
+
+### Core View Context (`web/src/contexts/ViewContext.tsx`)
+
+```typescript
+export type LayoutMode = "LIST" | "MASONRY";
+
+interface ViewContextValue {
+  orderByTimeAsc: boolean;  // Sort order
+  layout: LayoutMode;       // Current layout mode
+  toggleSortOrder: () => void;
+  setLayout: (layout: LayoutMode) => void;
+}
+
+// Persistent storage in localStorage
+const LOCAL_STORAGE_KEY = "memos-view-setting";
+
+// Default state
+return { orderByTimeAsc: false, layout: "LIST" as LayoutMode };
+```
+
+### Layout Modes
+
+#### 1. LIST Layout (`"LIST"`)
+
+- **Description**: Traditional linear list view
+- **Implementation**: Single column layout
+- **Behavior**: Memos displayed vertically in chronological order
+- **Use Case**: Reading-focused, sequential browsing
+
+#### 2. MASONRY Layout (`"MASONRY"`)
+
+- **Description**: Pinterest-style grid layout
+- **Implementation**: Multi-column responsive grid
+- **Behavior**: Memos distributed based on actual rendered heights
+- **Use Case**: Visual browsing, efficient space utilization
+
+### Masonry Layout Implementation
+
+#### Core Components
+
+1. **MasonryView** (`web/src/components/MasonryView/MasonryView.tsx`)
+   - Main container component
+   - Manages column distribution
+   - Uses CSS Grid for layout
+
+2. **MasonryColumn** (`web/src/components/MasonryView/MasonryColumn.tsx`)
+   - Represents individual columns
+   - Contains assigned memos
+   - Handles prefix elements (like memo editor)
+
+3. **MasonryItem** (`web/src/components/MasonryView/MasonryItem.tsx`)
+   - Wraps individual memos
+   - Measures actual rendered height
+   - Uses ResizeObserver for dynamic updates
+
+4. **useMasonryLayout** Hook (`web/src/components/MasonryView/useMasonryLayout.ts`)
+   - Calculates optimal column count
+   - Distributes memos to columns
+   - Manages height measurements
+
+#### Key Features
+
+##### 1. Height-Based Distribution
+
+```typescript
+// Smart algorithm that assigns memos to shortest column
+const shortestColumnIndex = columnHeights.reduce(
+  (minIndex, currentHeight, currentIndex) => 
+    (currentHeight < columnHeights[minIndex] ? currentIndex : minIndex),
+  0
+);
+```
+
+##### 2. Dynamic Column Count
+
+```typescript
+const calculateColumns = useCallback(() => {
+  if (!containerRef.current || listMode) return 1;
+  
+  const containerWidth = containerRef.current.offsetWidth;
+  const scale = containerWidth / MINIMUM_MEMO_VIEWPORT_WIDTH;
+  return scale >= 1.2 ? Math.ceil(scale) : 1;
+}, [containerRef, listMode]);
+```
+
+##### 3. ResizeObserver Integration
+
+```typescript
+useEffect(() => {
+  const measureHeight = () => {
+    if (itemRef.current) {
+      const height = itemRef.current.offsetHeight;
+      onHeightChange(memo.name, height);
+    }
+  };
+  
+  resizeObserverRef.current = new ResizeObserver(measureHeight);
+  resizeObserverRef.current.observe(itemRef.current);
+}, [memo.name, onHeightChange]);
+```
+
+##### 4. Responsive Behavior
+
+- Automatically adjusts columns based on viewport width
+- Minimum width threshold for multi-column layout
+- Smooth transitions during resizing
+
+### Layout Switching
+
+#### User Interface
+
+```typescript
+// MemoDisplaySettingMenu component
+<Select value={layout} onValueChange={(value) => setLayout(value as "LIST" | "MASONRY")}>
+  <SelectItem value="LIST">{t("memo.list")}</SelectItem>
+  <SelectItem value="MASONRY">{t("memo.masonry")}</SelectItem>
+</Select>
+```
+
+#### State Management
+
+```typescript
+const { layout, setLayout } = useView();
+
+// Toggle between layouts
+setLayout("MASONRY"); // or "LIST"
+
+// Persistence
+localStorage.setItem("memos-view-setting", JSON.stringify({ layout, orderByTimeAsc }));
+```
+
+### Integration with Memo Display
+
+#### PagedMemoList Component
+
+```typescript
+const PagedMemoList = (props: Props) => {
+  const { layout } = useView(); // Get current layout preference
+  
+  return (
+    <div className="flex flex-col justify-start items-start w-full max-w-full">
+      {layout === "MASONRY" ? (
+        <MasonryView
+          memoList={sortedMemoList}
+          renderer={props.renderer}
+          prefixElement={<MemoEditor />}
+        />
+      ) : (
+        // Traditional list view implementation
+        <ListView memoList={sortedMemoList} />
+      )}
+    </div>
+  );
+};
+```
+
+### Performance Optimizations
+
+1. **Debounced Redistribution**: Prevents excessive re-layout during rapid changes
+2. **Memoized Calculations**: Optimized height calculations and distribution algorithms
+3. **Efficient State Updates**: Only re-render when necessary
+4. **ResizeObserver Cleanup**: Proper memory management
+
+### Related Files
+
+- `web/src/contexts/ViewContext.tsx` - Global layout state management
+- `web/src/components/MasonryView/` - Masonry layout implementation
+- `web/src/components/MemoDisplaySettingMenu.tsx` - Layout selection UI
+- `web/src/components/PagedMemoList/PagedMemoList.tsx` - Memo list container
+- `web/src/components/MasonryView/README.md` - Detailed technical documentation
+
+### User Experience Benefits
+
+- **Choice**: Users can choose preferred browsing style
+- **Persistence**: Layout preference saved across sessions
+- **Responsiveness**: Adapts to different screen sizes
+- **Performance**: Optimized rendering for both modes
+- **Consistency**: Same memo content, different presentation
+
+The layout system provides flexible viewing options that cater to different user preferences and use cases while maintaining optimal performance and responsive design.

go.mod

@@ -0,0 +1,142 @@
+module github.com/usememos/memos
+
+go 1.25.7
+
+require (
+	connectrpc.com/connect v1.19.1
+	github.com/aws/aws-sdk-go-v2 v1.39.2
+	github.com/aws/aws-sdk-go-v2/config v1.31.12
+	github.com/aws/aws-sdk-go-v2/credentials v1.18.16
+	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.19.4
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.87.3
+	github.com/docker/docker v28.5.1+incompatible
+	github.com/go-sql-driver/mysql v1.9.3
+	github.com/google/cel-go v0.26.1
+	github.com/google/uuid v1.6.0
+	github.com/gorilla/feeds v1.2.0
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2
+	github.com/joho/godotenv v1.5.1
+	github.com/labstack/echo/v5 v5.0.3
+	github.com/lib/pq v1.10.9
+	github.com/lithammer/shortuuid/v4 v4.2.0
+	github.com/mark3labs/mcp-go v0.44.0
+	github.com/pkg/errors v0.9.1
+	github.com/spf13/cobra v1.10.1
+	github.com/spf13/viper v1.20.1
+	github.com/stretchr/testify v1.11.1
+	github.com/testcontainers/testcontainers-go v0.40.0
+	github.com/testcontainers/testcontainers-go/modules/mysql v0.40.0
+	github.com/testcontainers/testcontainers-go/modules/postgres v0.40.0
+	github.com/yuin/goldmark v1.7.13
+	golang.org/x/crypto v0.47.0
+	golang.org/x/mod v0.31.0
+	golang.org/x/net v0.49.0
+	golang.org/x/oauth2 v0.30.0
+	golang.org/x/sync v0.19.0
+	google.golang.org/genproto/googleapis/api v0.0.0-20250826171959-ef028d996bc1
+	google.golang.org/grpc v1.75.1
+	modernc.org/sqlite v1.38.2
+)
+
+require (
+	cel.dev/expr v0.24.0 // indirect
+	dario.cat/mergo v1.0.2 // indirect
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/antlr4-go/antlr/v4 v4.13.1 // indirect
+	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/containerd/errdefs v1.0.0 // indirect
+	github.com/containerd/errdefs/pkg v0.3.0 // indirect
+	github.com/containerd/log v0.1.0 // indirect
+	github.com/containerd/platforms v0.2.1 // indirect
+	github.com/cpuguy83/dockercfg v0.3.2 // indirect
+	github.com/distribution/reference v0.6.0 // indirect
+	github.com/docker/go-connections v0.6.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/ebitengine/purego v0.8.4 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.8.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/invopop/jsonschema v0.13.0 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
+	github.com/magiconair/properties v1.8.10 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/moby/docker-image-spec v1.3.1 // indirect
+	github.com/moby/go-archive v0.1.0 // indirect
+	github.com/moby/patternmatcher v0.6.0 // indirect
+	github.com/moby/sys/sequential v0.6.0 // indirect
+	github.com/moby/sys/user v0.4.0 // indirect
+	github.com/moby/sys/userns v0.1.0 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/ncruces/go-strftime v0.1.9 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/sagikazarmark/locafero v0.7.0 // indirect
+	github.com/sashabaranov/go-openai v1.41.2 // indirect
+	github.com/shirou/gopsutil/v4 v4.25.6 // indirect
+	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.12.0 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/stoewer/go-strcase v1.3.1 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0 // indirect
+	go.opentelemetry.io/otel v1.37.0 // indirect
+	go.opentelemetry.io/otel/metric v1.37.0 // indirect
+	go.opentelemetry.io/otel/trace v1.37.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b // indirect
+	golang.org/x/image v0.30.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250826171959-ef028d996bc1 // indirect
+	modernc.org/libc v1.66.8 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
+)
+
+require (
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.1 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.9 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.9 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.9 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.3 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.4.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.8.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.9 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.19.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.29.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.35.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.38.6 // indirect
+	github.com/aws/smithy-go v1.23.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/disintegration/imaging v1.6.2
+	github.com/golang-jwt/jwt/v5 v5.3.0
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/text v0.33.0
+	golang.org/x/time v0.14.0 // indirect
+	google.golang.org/protobuf v1.36.9
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,358 @@
+cel.dev/expr v0.24.0 h1:56OvJKSH3hDGL0ml5uSxZmz3/3Pq4tJ+fb1unVLAFcY=
+cel.dev/expr v0.24.0/go.mod h1:hLPLo1W4QUmuYdA72RBX06QTs6MXw941piREPl3Yfiw=
+connectrpc.com/connect v1.19.1 h1:R5M57z05+90EfEvCY1b7hBxDVOUl45PrtXtAV2fOC14=
+connectrpc.com/connect v1.19.1/go.mod h1:tN20fjdGlewnSFeZxLKb0xwIZ6ozc3OQs2hTXy4du9w=
+dario.cat/mergo v1.0.2 h1:85+piFYR1tMbRrLcDwR18y4UKJ3aH1Tbzi24VRW1TK8=
+dario.cat/mergo v1.0.2/go.mod h1:E/hbnu0NxMFBjpMIE34DRGLWqDy0g5FuKDhCb31ngxA=
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6 h1:He8afgbRMd7mFxO99hRNu+6tazq8nFF9lIwo9JFroBk=
+github.com/AdaLogics/go-fuzz-headers v0.0.0-20240806141605-e8a1dd7889d6/go.mod h1:8o94RPi1/7XTJvwPpRSzSUedZrtlirdB3r9Z20bi2f8=
+github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
+github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/antlr4-go/antlr/v4 v4.13.1 h1:SqQKkuVZ+zWkMMNkjy5FZe5mr5WURWnlpmOuzYWrPrQ=
+github.com/antlr4-go/antlr/v4 v4.13.1/go.mod h1:GKmUxMtwp6ZgGwZSva4eWPC5mS6vUAmOABFgjdkM7Nw=
+github.com/aws/aws-sdk-go-v2 v1.39.2 h1:EJLg8IdbzgeD7xgvZ+I8M1e0fL0ptn/M47lianzth0I=
+github.com/aws/aws-sdk-go-v2 v1.39.2/go.mod h1:sDioUELIUO9Znk23YVmIk86/9DOpkbyyVb1i/gUNFXY=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.1 h1:i8p8P4diljCr60PpJp6qZXNlgX4m2yQFpYk+9ZT+J4E=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.1/go.mod h1:ddqbooRZYNoJ2dsTwOty16rM+/Aqmk/GOXrK8cg7V00=
+github.com/aws/aws-sdk-go-v2/config v1.31.12 h1:pYM1Qgy0dKZLHX2cXslNacbcEFMkDMl+Bcj5ROuS6p8=
+github.com/aws/aws-sdk-go-v2/config v1.31.12/go.mod h1:/MM0dyD7KSDPR+39p9ZNVKaHDLb9qnfDurvVS2KAhN8=
+github.com/aws/aws-sdk-go-v2/credentials v1.18.16 h1:4JHirI4zp958zC026Sm+V4pSDwW4pwLefKrc0bF2lwI=
+github.com/aws/aws-sdk-go-v2/credentials v1.18.16/go.mod h1:qQMtGx9OSw7ty1yLclzLxXCRbrkjWAM7JnObZjmCB7I=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.9 h1:Mv4Bc0mWmv6oDuSWTKnk+wgeqPL5DRFu5bQL9BGPQ8Y=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.9/go.mod h1:IKlKfRppK2a1y0gy1yH6zD+yX5uplJ6UuPlgd48dJiQ=
+github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.19.4 h1:BTl+TXrpnrpPWb/J3527GsJ/lMkn7z3GO12j6OlsbRg=
+github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.19.4/go.mod h1:cG2tenc/fscpChiZE29a2crG9uo2t6nQGflFllFL8M8=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.9 h1:se2vOWGD3dWQUtfn4wEjRQJb1HK1XsNIt825gskZ970=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.9/go.mod h1:hijCGH2VfbZQxqCDN7bwz/4dzxV+hkyhjawAtdPWKZA=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.9 h1:6RBnKZLkJM4hQ+kN6E7yWFveOTg8NLPHAkqrs4ZPlTU=
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info.txt

@@ -0,0 +1,379 @@
+# MEMOS - PROJECT INFO (Bahasa Indonesia)
+
+## 📋 STRUKTUR PROYEK
+
+### Arsitektur Utama
+Proyek Memos adalah aplikasi catatan pribadi berbasis web yang dibangun dengan:
+- **Backend**: Go (Golang) versi 1.25
+- **Frontend**: React 18.3 + TypeScript
+- **Protokol API**: gRPC + Connect RPC
+- **Database**: SQLite (default), MySQL, PostgreSQL
+
+### Struktur Direktori Utama
+
+```
+memos/
+├── cmd/memos/              # Entry point aplikasi
+│   └── main.go             # File utama untuk menjalankan server
+├── server/                 # Server HTTP dan routing
+│   ├── server.go           # Konfigurasi Echo server
+│   ├── router/             # Routing API dan frontend
+│   │   ├── api/v1/         # Implementasi service gRPC
+│   │   ├── frontend/       # Serving file statis React
+│   │   └── fileserver/     # Serving file media
+│   └── auth/               # Autentikasi (JWT, PAT)
+├── store/                  # Layer data dan database
+│   ├── db/                 # Driver database (sqlite/mysql/postgres)
+│   ├── migration/          # File migrasi database
+│   └── *.go                # Model dan operasi data
+├── proto/                  # Definisi Protocol Buffer
+│   ├── api/v1/             # Service dan message definitions
+│   └── gen/                # Kode yang di-generate
+├── web/                    # Aplikasi frontend React
+│   ├── src/                # Source code TypeScript
+│   ├── package.json        # Dependencies frontend
+│   └── vite.config.mts     # Konfigurasi Vite
+└── plugin/                 # Plugin tambahan
+    ├── markdown/           # Parsing markdown
+    ├── email/              # Pengiriman email
+    ├── scheduler/          # Cron jobs
+    └── webhook/            # Webhook integration
+```
+
+## 🔧 CARA PEMBUATAN API
+
+### 1. Definisi Protokol Buffer (.proto)
+
+API didefinisikan dalam file `.proto` di direktori `proto/api/v1/`:
+
+Contoh: `memo_service.proto`
+```protobuf
+syntax = "proto3";
+
+package memos.api.v1;
+
+service MemoService {
+  rpc CreateMemo(CreateMemoRequest) returns (Memo) {
+    option (google.api.http) = {
+      post: "/api/v1/memos"
+      body: "memo"
+    };
+  }
+  
+  rpc ListMemos(ListMemosRequest) returns (ListMemosResponse) {
+    option (google.api.http) = {get: "/api/v1/memos"};
+  }
+}
+
+message Memo {
+  string name = 1;
+  string content = 7 [(google.api.field_behavior) = REQUIRED];
+  Visibility visibility = 9 [(google.api.field_behavior) = REQUIRED];
+}
+```
+
+### 2. Generate Kode dari Proto
+
+Jalankan perintah:
+```bash
+cd proto && buf generate
+```
+
+Ini akan menghasilkan:
+- Kode Go di `proto/gen/api/v1/` (untuk backend)
+- Kode TypeScript di `web/src/types/proto/api/v1/` (untuk frontend)
+
+### 3. Implementasi Service Backend
+
+File: `server/router/api/v1/memo_service.go`
+
+```go
+func (s *APIV1Service) CreateMemo(ctx context.Context, request *v1pb.CreateMemoRequest) (*v1pb.Memo, error) {
+    // 1. Validasi user
+    user, err := s.fetchCurrentUser(ctx)
+    if err != nil {
+        return nil, status.Errorf(codes.Unauthenticated, "user not authenticated")
+    }
+    
+    // 2. Mapping ke model store
+    create := &store.Memo{
+        UID:        shortuuid.New(),
+        CreatorID:  user.ID,
+        Content:    request.Memo.Content,
+        Visibility: convertVisibilityToStore(request.Memo.Visibility),
+    }
+    
+    // 3. Simpan ke database
+    memo, err := s.Store.CreateMemo(ctx, create)
+    if err != nil {
+        return nil, err
+    }
+    
+    // 4. Convert ke response proto
+    return s.convertMemoFromStore(ctx, memo, nil, nil)
+}
+```
+
+### 4. Registrasi Service
+
+File: `server/router/api/v1/v1.go`
+
+```go
+// Register gRPC gateway
+if err := apiV1Service.RegisterGateway(ctx, echoServer); err != nil {
+    return nil, errors.Wrap(err, "failed to register gRPC gateway")
+}
+
+// Register Connect handlers
+connectHandlers := v1pbconnect.NewMemoServiceHandler(apiV1Service)
+echoServer.POST("/memos.api.v1.MemoService/CreateMemo", 
+    connect.NewHandler(connectHandlers.CreateMemo))
+```
+
+### 5. Middleware dan Interceptor
+
+Autentikasi dilakukan melalui interceptor:
+- **Connect Interceptor**: `connect_interceptors.go`
+- **gRPC Gateway Interceptor**: Middleware Echo
+
+## 🖥️ FRONTEND MENGGUNAKAN TEKNOLOGI
+
+### Framework dan Library Utama
+
+1. **React 18.3** - Library UI utama
+2. **TypeScript** - Typing untuk JavaScript
+3. **Vite 7** - Build tool dan development server
+4. **Tailwind CSS 4** - Styling utility-first
+5. **React Query (TanStack Query) v5** - State management server
+6. **Connect RPC** - Komunikasi dengan backend
+
+### State Management
+
+#### 1. Server State (React Query)
+```typescript
+// hooks/useMemoQueries.ts
+export const useMemos = (filters: MemoFilters) => {
+  return useQuery({
+    queryKey: memoKeys.list(filters),
+    queryFn: () => memoServiceClient.listMemos({ filter: filters.query }),
+  });
+};
+
+export const useCreateMemo = () => {
+  const queryClient = useQueryClient();
+  return useMutation({
+    mutationFn: (memo: CreateMemoRequest) => 
+      memoServiceClient.createMemo(memo),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: memoKeys.all });
+    },
+  });
+};
+```
+
+#### 2. Client State (React Context)
+```typescript
+// contexts/AuthContext.tsx
+const AuthContext = createContext<AuthContextValue | null>(null);
+
+export function AuthProvider({ children }: { children: ReactNode }) {
+  const [currentUser, setCurrentUser] = useState<User | undefined>();
+  
+  const logout = useCallback(async () => {
+    await authServiceClient.signOut({});
+    setCurrentUser(undefined);
+  }, []);
+  
+  return (
+    <AuthContext.Provider value={{ currentUser, logout }}>
+      {children}
+    </AuthContext.Provider>
+  );
+}
+```
+
+### Komunikasi API
+
+File: `web/src/connect.ts`
+
+```typescript
+// Transport dengan autentikasi
+const transport = createConnectTransport({
+  baseUrl: window.location.origin,
+  useBinaryFormat: true,
+  interceptors: [authInterceptor], // Menangani JWT token
+});
+
+// Client service
+export const memoServiceClient = createClient(MemoService, transport);
+export const userServiceClient = createClient(UserService, transport);
+```
+
+### Routing
+
+Menggunakan React Router DOM v7:
+```typescript
+// router/index.tsx
+const router = createBrowserRouter([
+  {
+    path: "/",
+    element: <App />,
+    children: [
+      { index: true, element: <Home /> },
+      { path: "/m/:memoId", element: <MemoDetail /> },
+      { path: "/auth", element: <AuthLayout /> },
+    ],
+  },
+]);
+```
+
+### Styling
+
+Menggunakan Tailwind CSS dengan komponen UI:
+```tsx
+// components/ui/button.tsx
+import { cva, type VariantProps } from "class-variance-authority";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground hover:bg-primary/90",
+        destructive: "bg-destructive text-destructive-foreground",
+        outline: "border border-input bg-background hover:bg-accent",
+      },
+      size: {
+        default: "h-10 px-4 py-2",
+        sm: "h-9 rounded-md px-3",
+        lg: "h-11 rounded-md px-8",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+);
+```
+
+## ⚙️ ARSITEKTUR API DUAL PROTOCOL
+
+### 1. Connect RPC (Untuk Browser)
+- Path: `/memos.api.v1.MemoService/*`
+- Format: Binary protocol buffers
+- Digunakan oleh frontend React
+
+### 2. gRPC-Gateway (REST API)
+- Path: `/api/v1/memos`
+- Format: JSON over HTTP
+- Berguna untuk integrasi eksternal
+
+Keduanya menggunakan implementasi service yang sama, sehingga konsisten.
+
+## 🔐 AUTENTIKASI
+
+### Metode Token
+1. **JWT Access Token V2** - Stateless, 15 menit expiry
+2. **Personal Access Token (PAT)** - Stateful, long-lived
+
+### Flow Autentikasi
+```typescript
+// Frontend interceptor
+const authInterceptor: Interceptor = (next) => async (req) => {
+  const token = getAccessToken();
+  if (token) {
+    req.header.set("Authorization", `Bearer ${token}`);
+  }
+  
+  try {
+    return await next(req);
+  } catch (error) {
+    if (error.code === Code.Unauthenticated) {
+      // Refresh token otomatis
+      await refreshAccessToken();
+      // Retry request
+      return await next(req);
+    }
+    throw error;
+  }
+};
+```
+
+## 🗃️ DATABASE
+
+### Layer Abstraksi
+```go
+type Driver interface {
+    CreateMemo(ctx context.Context, create *Memo) (*Memo, error)
+    ListMemos(ctx context.Context, find *FindMemo) ([]*Memo, error)
+    UpdateMemo(ctx context.Context, update *UpdateMemo) error
+    DeleteMemo(ctx context.Context, delete *DeleteMemo) error
+}
+```
+
+### Implementasi:
+- SQLite: `store/db/sqlite/`
+- MySQL: `store/db/mysql/`
+- PostgreSQL: `store/db/postgres/`
+
+### Caching:
+Menggunakan in-memory cache untuk:
+- Pengaturan instance
+- Data user
+- Pengaturan user
+
+## 🚀 DEVELOPMENT WORKFLOW
+
+### Backend Development
+```bash
+# Jalankan server development
+go run ./cmd/memos --port 8081
+
+# Testing
+go test ./...
+
+# Linting
+golangci-lint run
+```
+
+### Frontend Development
+```bash
+cd web
+pnpm install
+pnpm dev  # Server jalan di port 3001, proxy ke 8081
+```
+
+### Generate Proto
+```bash
+cd proto
+buf generate
+```
+
+## 📦 DEPLOYMENT
+
+### Opsi Deployment:
+1. **Docker** (Direkomendasikan)
+2. **Binary langsung**
+3. **Docker Compose**
+4. **Kubernetes**
+
+### Contoh Docker:
+```bash
+docker run -d \
+  --name memos \
+  -p 5230:5230 \
+  -v ~/.memos:/var/opt/memos \
+  neosmemo/memos:stable
+```
+
+---
+
+**Ringkasan Teknologi Utama:**
+- **Bahasa**: Go + TypeScript
+- **Framework**: React 18 + Echo (Go)
+- **API**: gRPC + Connect RPC + REST
+- **Database**: SQLite/MySQL/PostgreSQL
+- **Build Tool**: Vite + buf (proto)
+- **State Management**: React Query + Context
+- **Styling**: Tailwind CSS

internal/base/resource_name.go

@@ -0,0 +1,7 @@
+package base
+
+import "regexp"
+
+var (
+	UIDMatcher = regexp.MustCompile("^[a-zA-Z0-9]([a-zA-Z0-9-]{0,30}[a-zA-Z0-9])?$")
+)

internal/base/resource_name_test.go

@@ -0,0 +1,35 @@
+package base
+
+import (
+	"testing"
+)
+
+func TestUIDMatcher(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected bool
+	}{
+		{"", false},
+		{"-abc123", false},
+		{"012345678901234567890123456789", true},
+		{"1abc-123", true},
+		{"A123B456C789", true},
+		{"a", true},
+		{"ab", true},
+		{"a*b&c", false},
+		{"a--b", true},
+		{"a-1b-2c", true},
+		{"a1234567890123456789012345678901", true},
+		{"abc123", true},
+		{"abc123-", false},
+	}
+
+	for _, test := range tests {
+		t.Run(test.input, func(*testing.T) {
+			result := UIDMatcher.MatchString(test.input)
+			if result != test.expected {
+				t.Errorf("For input '%s', expected %v but got %v", test.input, test.expected, result)
+			}
+		})
+	}
+}

internal/profile/profile.go

@@ -0,0 +1,109 @@
+package profile
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// Profile is the configuration to start main server.
+type Profile struct {
+	// Demo indicates if the server is in demo mode
+	Demo bool
+	// Addr is the binding address for server
+	Addr string
+	// Port is the binding port for server
+	Port int
+	// UNIXSock is the IPC binding path. Overrides Addr and Port
+	UNIXSock string
+	// Data is the data directory
+	Data string
+	// DSN points to where memos stores its own data
+	DSN string
+	// Driver is the database driver
+	// sqlite, mysql
+	Driver string
+	// Version is the current version of server
+	Version string
+	// InstanceURL is the url of your memos instance.
+	InstanceURL string
+	// LowCPU enables low CPU usage mode
+	LowCPU bool
+}
+
+func checkDataDir(dataDir string) (string, error) {
+	// Convert to absolute path if relative path is supplied.
+	if !filepath.IsAbs(dataDir) {
+		// Use current working directory, not the binary's directory
+		// This ensures we use the actual working directory where the process runs
+		absDir, err := filepath.Abs(dataDir)
+		if err != nil {
+			return "", err
+		}
+		dataDir = absDir
+	}
+
+	// Trim trailing \ or / in case user supplies
+	dataDir = strings.TrimRight(dataDir, "\\/")
+	if _, err := os.Stat(dataDir); err != nil {
+		return "", errors.Wrapf(err, "unable to access data folder %s", dataDir)
+	}
+	return dataDir, nil
+}
+
+func (p *Profile) Validate() error {
+	// Set default data directory if not specified
+	if p.Data == "" {
+		if runtime.GOOS == "windows" {
+			p.Data = filepath.Join(os.Getenv("ProgramData"), "memos")
+		} else {
+			// On Linux/macOS, check if /var/opt/memos exists and is writable (Docker scenario)
+			if info, err := os.Stat("/var/opt/memos"); err == nil && info.IsDir() {
+				// Check if we can write to this directory
+				testFile := filepath.Join("/var/opt/memos", ".write-test")
+				if err := os.WriteFile(testFile, []byte("test"), 0600); err == nil {
+					os.Remove(testFile)
+					p.Data = "/var/opt/memos"
+				} else {
+					// /var/opt/memos exists but is not writable, use current directory
+					slog.Warn("/var/opt/memos is not writable, using current directory")
+					p.Data = "."
+				}
+			} else {
+				// /var/opt/memos doesn't exist, use current directory (local development)
+				p.Data = "."
+			}
+		}
+	}
+
+	// Create data directory if it doesn't exist
+	if _, err := os.Stat(p.Data); os.IsNotExist(err) {
+		if err := os.MkdirAll(p.Data, 0770); err != nil {
+			slog.Error("failed to create data directory", slog.String("data", p.Data), slog.String("error", err.Error()))
+			return err
+		}
+	}
+
+	dataDir, err := checkDataDir(p.Data)
+	if err != nil {
+		slog.Error("failed to check dsn", slog.String("data", dataDir), slog.String("error", err.Error()))
+		return err
+	}
+
+	p.Data = dataDir
+	if p.Driver == "sqlite" && p.DSN == "" {
+		mode := "prod"
+		if p.Demo {
+			mode = "demo"
+		}
+		dbFile := fmt.Sprintf("memos_%s.db", mode)
+		p.DSN = filepath.Join(dataDir, dbFile)
+	}
+
+	return nil
+}

internal/util/util.go

@@ -0,0 +1,73 @@
+package util //nolint:revive // util namespace is intentional for shared helpers
+
+import (
+	"crypto/rand"
+	"math/big"
+	"net/mail"
+	"strconv"
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+// ConvertStringToInt32 converts a string to int32.
+func ConvertStringToInt32(src string) (int32, error) {
+	parsed, err := strconv.ParseInt(src, 10, 32)
+	if err != nil {
+		return 0, err
+	}
+	return int32(parsed), nil
+}
+
+// HasPrefixes returns true if the string s has any of the given prefixes.
+func HasPrefixes(src string, prefixes ...string) bool {
+	for _, prefix := range prefixes {
+		if strings.HasPrefix(src, prefix) {
+			return true
+		}
+	}
+	return false
+}
+
+// ValidateEmail validates the email.
+func ValidateEmail(email string) bool {
+	if _, err := mail.ParseAddress(email); err != nil {
+		return false
+	}
+	return true
+}
+
+func GenUUID() string {
+	return uuid.New().String()
+}
+
+var letters = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+// RandomString returns a random string with length n.
+func RandomString(n int) (string, error) {
+	var sb strings.Builder
+	sb.Grow(n)
+	for i := 0; i < n; i++ {
+		// The reason for using crypto/rand instead of math/rand is that
+		// the former relies on hardware to generate random numbers and
+		// thus has a stronger source of random numbers.
+		randNum, err := rand.Int(rand.Reader, big.NewInt(int64(len(letters))))
+		if err != nil {
+			return "", err
+		}
+		if _, err := sb.WriteRune(letters[randNum.Uint64()]); err != nil {
+			return "", err
+		}
+	}
+	return sb.String(), nil
+}
+
+// ReplaceString replaces all occurrences of old in slice with new.
+func ReplaceString(slice []string, old, new string) []string {
+	for i, s := range slice {
+		if s == old {
+			slice[i] = new
+		}
+	}
+	return slice
+}

internal/util/util_test.go

@@ -0,0 +1,31 @@
+package util //nolint:revive // util is an appropriate package name for utility functions
+
+import (
+	"testing"
+)
+
+func TestValidateEmail(t *testing.T) {
+	tests := []struct {
+		email string
+		want  bool
+	}{
+		{
+			email: "t@gmail.com",
+			want:  true,
+		},
+		{
+			email: "@usememos.com",
+			want:  false,
+		},
+		{
+			email: "1@gmail",
+			want:  true,
+		},
+	}
+	for _, test := range tests {
+		result := ValidateEmail(test.email)
+		if result != test.want {
+			t.Errorf("Validate Email %s: got result %v, want %v.", test.email, result, test.want)
+		}
+	}
+}

internal/version/version.go

@@ -0,0 +1,54 @@
+package version
+
+import (
+	"fmt"
+	"strings"
+
+	"golang.org/x/mod/semver"
+)
+
+// Version is the service current released version.
+// Semantic versioning: https://semver.org/
+var Version = "0.26.2"
+
+func GetCurrentVersion() string {
+	return Version
+}
+
+// GetMinorVersion extracts the minor version (e.g., "0.25") from a full version string (e.g., "0.25.1").
+// Returns the minor version string or empty string if the version format is invalid.
+// Version format should be "major.minor.patch" (e.g., "0.25.1").
+func GetMinorVersion(version string) string {
+	versionList := strings.Split(version, ".")
+	if len(versionList) < 2 {
+		return ""
+	}
+	// Return major.minor only (first two components)
+	return versionList[0] + "." + versionList[1]
+}
+
+// IsVersionGreaterOrEqualThan returns true if version is greater than or equal to target.
+func IsVersionGreaterOrEqualThan(version, target string) bool {
+	return semver.Compare(fmt.Sprintf("v%s", version), fmt.Sprintf("v%s", target)) > -1
+}
+
+// IsVersionGreaterThan returns true if version is greater than target.
+func IsVersionGreaterThan(version, target string) bool {
+	return semver.Compare(fmt.Sprintf("v%s", version), fmt.Sprintf("v%s", target)) > 0
+}
+
+type SortVersion []string
+
+func (s SortVersion) Len() int {
+	return len(s)
+}
+
+func (s SortVersion) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s SortVersion) Less(i, j int) bool {
+	v1 := fmt.Sprintf("v%s", s[i])
+	v2 := fmt.Sprintf("v%s", s[j])
+	return semver.Compare(v1, v2) == -1
+}

internal/version/version_test.go

@@ -0,0 +1,103 @@
+package version
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsVersionGreaterOrEqualThan(t *testing.T) {
+	tests := []struct {
+		version string
+		target  string
+		want    bool
+	}{
+		{
+			version: "0.9.1",
+			target:  "0.9.1",
+			want:    true,
+		},
+		{
+			version: "0.10.0",
+			target:  "0.9.1",
+			want:    true,
+		},
+		{
+			version: "0.9.0",
+			target:  "0.9.1",
+			want:    false,
+		},
+	}
+	for _, test := range tests {
+		result := IsVersionGreaterOrEqualThan(test.version, test.target)
+		if result != test.want {
+			t.Errorf("got result %v, want %v.", result, test.want)
+		}
+	}
+}
+
+func TestIsVersionGreaterThan(t *testing.T) {
+	tests := []struct {
+		version string
+		target  string
+		want    bool
+	}{
+		{
+			version: "0.9.1",
+			target:  "0.9.1",
+			want:    false,
+		},
+		{
+			version: "0.10.0",
+			target:  "0.8.0",
+			want:    true,
+		},
+		{
+			version: "0.23",
+			target:  "0.22",
+			want:    true,
+		},
+		{
+			version: "0.8.0",
+			target:  "0.10.0",
+			want:    false,
+		},
+		{
+			version: "0.9.0",
+			target:  "0.9.1",
+			want:    false,
+		},
+		{
+			version: "0.22",
+			target:  "0.22",
+			want:    false,
+		},
+	}
+	for _, test := range tests {
+		result := IsVersionGreaterThan(test.version, test.target)
+		if result != test.want {
+			t.Errorf("got result %v, want %v.", result, test.want)
+		}
+	}
+}
+
+func TestSortVersion(t *testing.T) {
+	tests := []struct {
+		versionList []string
+		want        []string
+	}{
+		{
+			versionList: []string{"0.9.1", "0.10.0", "0.8.0"},
+			want:        []string{"0.8.0", "0.9.1", "0.10.0"},
+		},
+		{
+			versionList: []string{"1.9.1", "0.9.1", "0.10.0", "0.8.0"},
+			want:        []string{"0.8.0", "0.9.1", "0.10.0", "1.9.1"},
+		},
+	}
+	for _, test := range tests {
+		sort.Sort(SortVersion(test.versionList))
+		assert.Equal(t, test.versionList, test.want)
+	}
+}

plugin/ai/groq/groq.go

@@ -0,0 +1,110 @@
+package ai
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/sashabaranov/go-openai"
+)
+
+type GroqClient struct {
+	client *openai.Client
+	config GroqConfig
+}
+
+type GroqConfig struct {
+	APIKey      string
+	BaseURL     string
+	DefaultModel string
+}
+
+type CompletionRequest struct {
+	Model       string
+	Prompt      string
+	Temperature float32
+	MaxTokens   int
+}
+
+type CompletionResponse struct {
+	Text          string
+	Model         string
+	PromptTokens  int
+	CompletionTokens int
+	TotalTokens   int
+}
+
+func NewGroqClient(config GroqConfig) *GroqClient {
+	if config.BaseURL == "" {
+		config.BaseURL = "https://api.groq.com/openai/v1"
+	}
+	
+	clientConfig := openai.DefaultConfig(config.APIKey)
+	clientConfig.BaseURL = config.BaseURL
+	
+	return &GroqClient{
+		client: openai.NewClientWithConfig(clientConfig),
+		config: config,
+	}
+}
+
+func (g *GroqClient) TestConnection(ctx context.Context) error {
+	// Test by listing available models
+	_, err := g.client.ListModels(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to connect to Groq API: %w", err)
+	}
+	return nil
+}
+
+func (g *GroqClient) GenerateCompletion(ctx context.Context, req CompletionRequest) (*CompletionResponse, error) {
+	model := req.Model
+	if model == "" {
+		model = g.config.DefaultModel
+	}
+	if model == "" {
+		model = "llama-3.1-8b-instant"
+	}
+
+	chatReq := openai.ChatCompletionRequest{
+		Model: model,
+		Messages: []openai.ChatCompletionMessage{
+			{
+				Role:    openai.ChatMessageRoleUser,
+				Content: req.Prompt,
+			},
+		},
+		Temperature: req.Temperature,
+		MaxTokens:   req.MaxTokens,
+	}
+
+	resp, err := g.client.CreateChatCompletion(ctx, chatReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate completion: %w", err)
+	}
+
+	if len(resp.Choices) == 0 {
+		return nil, fmt.Errorf("no completion choices returned")
+	}
+
+	return &CompletionResponse{
+		Text:             resp.Choices[0].Message.Content,
+		Model:            resp.Model,
+		PromptTokens:     resp.Usage.PromptTokens,
+		CompletionTokens: resp.Usage.CompletionTokens,
+		TotalTokens:      resp.Usage.TotalTokens,
+	}, nil
+}
+
+func (g *GroqClient) ListModels(ctx context.Context) ([]string, error) {
+	models, err := g.client.ListModels(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list models: %w", err)
+	}
+
+	var modelNames []string
+	for _, model := range models.Models {
+		modelNames = append(modelNames, model.ID)
+	}
+	
+	return modelNames, nil
+}

plugin/ai/ollama/ollama.go

@@ -0,0 +1,199 @@
+package ai
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+type OllamaClient struct {
+	httpClient *http.Client
+	config     OllamaConfig
+}
+
+type OllamaConfig struct {
+	Host         string
+	DefaultModel string
+	Timeout      time.Duration
+}
+
+// CompletionRequest is the input for generating completions.
+type CompletionRequest struct {
+	Model       string
+	Prompt      string
+	Temperature float32
+	MaxTokens   int
+}
+
+// CompletionResponse is the output from generating completions.
+type CompletionResponse struct {
+	Text             string
+	Model            string
+	PromptTokens     int
+	CompletionTokens int
+	TotalTokens      int
+}
+
+type OllamaGenerateRequest struct {
+	Model   string `json:"model"`
+	Prompt  string `json:"prompt"`
+	Stream  bool   `json:"stream"`
+	Options map[string]interface{} `json:"options,omitempty"`
+}
+
+type OllamaGenerateResponse struct {
+	Model     string `json:"model"`
+	Response  string `json:"response"`
+	Done      bool   `json:"done"`
+	Context   []int  `json:"context,omitempty"`
+	TotalDuration int64 `json:"total_duration,omitempty"`
+	LoadDuration  int64 `json:"load_duration,omitempty"`
+	PromptEvalCount int `json:"prompt_eval_count,omitempty"`
+	PromptEvalDuration int64 `json:"prompt_eval_duration,omitempty"`
+	EvalCount int `json:"eval_count,omitempty"`
+	EvalDuration int64 `json:"eval_duration,omitempty"`
+}
+
+type OllamaTagsResponse struct {
+	Models []struct {
+		Name    string `json:"name"`
+		Model   string `json:"model"`
+		Size    int64  `json:"size"`
+		Digest  string `json:"digest"`
+	} `json:"models"`
+}
+
+func NewOllamaClient(config OllamaConfig) *OllamaClient {
+	if config.Timeout == 0 {
+		config.Timeout = 120 * time.Second // Increase to 2 minutes for generation
+	}
+	
+	return &OllamaClient{
+		httpClient: &http.Client{
+			Timeout: config.Timeout,
+		},
+		config: config,
+	}
+}
+
+func (o *OllamaClient) TestConnection(ctx context.Context) error {
+	url := fmt.Sprintf("%s/api/tags", o.config.Host)
+	
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return fmt.Errorf("failed to create request: %w", err)
+	}
+	
+	resp, err := o.httpClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("failed to connect to Ollama: %w", err)
+	}
+	defer resp.Body.Close()
+	
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("Ollama returned status %d: %s", resp.StatusCode, string(body))
+	}
+	
+	return nil
+}
+
+func (o *OllamaClient) GenerateCompletion(ctx context.Context, req CompletionRequest) (*CompletionResponse, error) {
+	model := req.Model
+	if model == "" {
+		model = o.config.DefaultModel
+	}
+	if model == "" {
+		model = "llama3"
+	}
+
+	ollamaReq := OllamaGenerateRequest{
+		Model:  model,
+		Prompt: req.Prompt,
+		Stream: false,
+		Options: map[string]interface{}{
+			"temperature": req.Temperature,
+		},
+	}
+
+	if req.MaxTokens > 0 {
+		ollamaReq.Options["num_predict"] = req.MaxTokens
+	}
+
+	jsonData, err := json.Marshal(ollamaReq)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	url := fmt.Sprintf("%s/api/generate", o.config.Host)
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	resp, err := o.httpClient.Do(httpReq)
+	if err != nil {
+		// Check if it's a timeout error
+		if ctx.Err() == context.DeadlineExceeded {
+			return nil, fmt.Errorf("Ollama request timed out after %.0f seconds. Try reducing the max tokens or using a smaller model", o.config.Timeout.Seconds())
+		}
+		return nil, fmt.Errorf("failed to call Ollama API: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("Ollama returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	var ollamaResp OllamaGenerateResponse
+	if err := json.NewDecoder(resp.Body).Decode(&ollamaResp); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	return &CompletionResponse{
+		Text:          ollamaResp.Response,
+		Model:         ollamaResp.Model,
+		PromptTokens:  ollamaResp.PromptEvalCount,
+		CompletionTokens: ollamaResp.EvalCount,
+		TotalTokens:   ollamaResp.PromptEvalCount + ollamaResp.EvalCount,
+	}, nil
+}
+
+func (o *OllamaClient) ListModels(ctx context.Context) ([]string, error) {
+	url := fmt.Sprintf("%s/api/tags", o.config.Host)
+	
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	
+	resp, err := o.httpClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get models: %w", err)
+	}
+	defer resp.Body.Close()
+	
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("Ollama returned status %d: %s", resp.StatusCode, string(body))
+	}
+	
+	var tagsResp OllamaTagsResponse
+	if err := json.NewDecoder(resp.Body).Decode(&tagsResp); err != nil {
+		return nil, fmt.Errorf("failed to decode models response: %w", err)
+	}
+
+	var modelNames []string
+	for _, model := range tagsResp.Models {
+		modelNames = append(modelNames, model.Name)
+	}
+	
+	return modelNames, nil
+}

plugin/cron/README.md

@@ -0,0 +1 @@
+Fork from https://github.com/robfig/cron

plugin/cron/chain.go

@@ -0,0 +1,96 @@
+package cron
+
+import (
+	"errors"
+	"fmt"
+	"runtime"
+	"sync"
+	"time"
+)
+
+// JobWrapper decorates the given Job with some behavior.
+type JobWrapper func(Job) Job
+
+// Chain is a sequence of JobWrappers that decorates submitted jobs with
+// cross-cutting behaviors like logging or synchronization.
+type Chain struct {
+	wrappers []JobWrapper
+}
+
+// NewChain returns a Chain consisting of the given JobWrappers.
+func NewChain(c ...JobWrapper) Chain {
+	return Chain{c}
+}
+
+// Then decorates the given job with all JobWrappers in the chain.
+//
+// This:
+//
+//	NewChain(m1, m2, m3).Then(job)
+//
+// is equivalent to:
+//
+//	m1(m2(m3(job)))
+func (c Chain) Then(j Job) Job {
+	for i := range c.wrappers {
+		j = c.wrappers[len(c.wrappers)-i-1](j)
+	}
+	return j
+}
+
+// Recover panics in wrapped jobs and log them with the provided logger.
+func Recover(logger Logger) JobWrapper {
+	return func(j Job) Job {
+		return FuncJob(func() {
+			defer func() {
+				if r := recover(); r != nil {
+					const size = 64 << 10
+					buf := make([]byte, size)
+					buf = buf[:runtime.Stack(buf, false)]
+					err, ok := r.(error)
+					if !ok {
+						err = errors.New("panic: " + fmt.Sprint(r))
+					}
+					logger.Error(err, "panic", "stack", "...\n"+string(buf))
+				}
+			}()
+			j.Run()
+		})
+	}
+}
+
+// DelayIfStillRunning serializes jobs, delaying subsequent runs until the
+// previous one is complete. Jobs running after a delay of more than a minute
+// have the delay logged at Info.
+func DelayIfStillRunning(logger Logger) JobWrapper {
+	return func(j Job) Job {
+		var mu sync.Mutex
+		return FuncJob(func() {
+			start := time.Now()
+			mu.Lock()
+			defer mu.Unlock()
+			if dur := time.Since(start); dur > time.Minute {
+				logger.Info("delay", "duration", dur)
+			}
+			j.Run()
+		})
+	}
+}
+
+// SkipIfStillRunning skips an invocation of the Job if a previous invocation is
+// still running. It logs skips to the given logger at Info level.
+func SkipIfStillRunning(logger Logger) JobWrapper {
+	return func(j Job) Job {
+		var ch = make(chan struct{}, 1)
+		ch <- struct{}{}
+		return FuncJob(func() {
+			select {
+			case v := <-ch:
+				defer func() { ch <- v }()
+				j.Run()
+			default:
+				logger.Info("skip")
+			}
+		})
+	}
+}

plugin/cron/chain_test.go

@@ -0,0 +1,239 @@
+//nolint:all
+package cron
+
+import (
+	"io"
+	"log"
+	"reflect"
+	"sync"
+	"testing"
+	"time"
+)
+
+func appendingJob(slice *[]int, value int) Job {
+	var m sync.Mutex
+	return FuncJob(func() {
+		m.Lock()
+		*slice = append(*slice, value)
+		m.Unlock()
+	})
+}
+
+func appendingWrapper(slice *[]int, value int) JobWrapper {
+	return func(j Job) Job {
+		return FuncJob(func() {
+			appendingJob(slice, value).Run()
+			j.Run()
+		})
+	}
+}
+
+func TestChain(t *testing.T) {
+	var nums []int
+	var (
+		append1 = appendingWrapper(&nums, 1)
+		append2 = appendingWrapper(&nums, 2)
+		append3 = appendingWrapper(&nums, 3)
+		append4 = appendingJob(&nums, 4)
+	)
+	NewChain(append1, append2, append3).Then(append4).Run()
+	if !reflect.DeepEqual(nums, []int{1, 2, 3, 4}) {
+		t.Error("unexpected order of calls:", nums)
+	}
+}
+
+func TestChainRecover(t *testing.T) {
+	panickingJob := FuncJob(func() {
+		panic("panickingJob panics")
+	})
+
+	t.Run("panic exits job by default", func(*testing.T) {
+		defer func() {
+			if err := recover(); err == nil {
+				t.Errorf("panic expected, but none received")
+			}
+		}()
+		NewChain().Then(panickingJob).
+			Run()
+	})
+
+	t.Run("Recovering JobWrapper recovers", func(*testing.T) {
+		NewChain(Recover(PrintfLogger(log.New(io.Discard, "", 0)))).
+			Then(panickingJob).
+			Run()
+	})
+
+	t.Run("composed with the *IfStillRunning wrappers", func(*testing.T) {
+		NewChain(Recover(PrintfLogger(log.New(io.Discard, "", 0)))).
+			Then(panickingJob).
+			Run()
+	})
+}
+
+type countJob struct {
+	m       sync.Mutex
+	started int
+	done    int
+	delay   time.Duration
+}
+
+func (j *countJob) Run() {
+	j.m.Lock()
+	j.started++
+	j.m.Unlock()
+	time.Sleep(j.delay)
+	j.m.Lock()
+	j.done++
+	j.m.Unlock()
+}
+
+func (j *countJob) Started() int {
+	defer j.m.Unlock()
+	j.m.Lock()
+	return j.started
+}
+
+func (j *countJob) Done() int {
+	defer j.m.Unlock()
+	j.m.Lock()
+	return j.done
+}
+
+func TestChainDelayIfStillRunning(t *testing.T) {
+	t.Run("runs immediately", func(*testing.T) {
+		var j countJob
+		wrappedJob := NewChain(DelayIfStillRunning(DiscardLogger)).Then(&j)
+		go wrappedJob.Run()
+		time.Sleep(2 * time.Millisecond) // Give the job 2ms to complete.
+		if c := j.Done(); c != 1 {
+			t.Errorf("expected job run once, immediately, got %d", c)
+		}
+	})
+
+	t.Run("second run immediate if first done", func(*testing.T) {
+		var j countJob
+		wrappedJob := NewChain(DelayIfStillRunning(DiscardLogger)).Then(&j)
+		go func() {
+			go wrappedJob.Run()
+			time.Sleep(time.Millisecond)
+			go wrappedJob.Run()
+		}()
+		time.Sleep(3 * time.Millisecond) // Give both jobs 3ms to complete.
+		if c := j.Done(); c != 2 {
+			t.Errorf("expected job run twice, immediately, got %d", c)
+		}
+	})
+
+	t.Run("second run delayed if first not done", func(*testing.T) {
+		var j countJob
+		j.delay = 10 * time.Millisecond
+		wrappedJob := NewChain(DelayIfStillRunning(DiscardLogger)).Then(&j)
+		go func() {
+			go wrappedJob.Run()
+			time.Sleep(time.Millisecond)
+			go wrappedJob.Run()
+		}()
+
+		// After 5ms, the first job is still in progress, and the second job was
+		// run but should be waiting for it to finish.
+		time.Sleep(5 * time.Millisecond)
+		started, done := j.Started(), j.Done()
+		if started != 1 || done != 0 {
+			t.Error("expected first job started, but not finished, got", started, done)
+		}
+
+		// Verify that the second job completes.
+		time.Sleep(25 * time.Millisecond)
+		started, done = j.Started(), j.Done()
+		if started != 2 || done != 2 {
+			t.Error("expected both jobs done, got", started, done)
+		}
+	})
+}
+
+func TestChainSkipIfStillRunning(t *testing.T) {
+	t.Run("runs immediately", func(*testing.T) {
+		var j countJob
+		wrappedJob := NewChain(SkipIfStillRunning(DiscardLogger)).Then(&j)
+		go wrappedJob.Run()
+		time.Sleep(2 * time.Millisecond) // Give the job 2ms to complete.
+		if c := j.Done(); c != 1 {
+			t.Errorf("expected job run once, immediately, got %d", c)
+		}
+	})
+
+	t.Run("second run immediate if first done", func(*testing.T) {
+		var j countJob
+		wrappedJob := NewChain(SkipIfStillRunning(DiscardLogger)).Then(&j)
+		go func() {
+			go wrappedJob.Run()
+			time.Sleep(time.Millisecond)
+			go wrappedJob.Run()
+		}()
+		time.Sleep(3 * time.Millisecond) // Give both jobs 3ms to complete.
+		if c := j.Done(); c != 2 {
+			t.Errorf("expected job run twice, immediately, got %d", c)
+		}
+	})
+
+	t.Run("second run skipped if first not done", func(*testing.T) {
+		var j countJob
+		j.delay = 10 * time.Millisecond
+		wrappedJob := NewChain(SkipIfStillRunning(DiscardLogger)).Then(&j)
+		go func() {
+			go wrappedJob.Run()
+			time.Sleep(time.Millisecond)
+			go wrappedJob.Run()
+		}()
+
+		// After 5ms, the first job is still in progress, and the second job was
+		// already skipped.
+		time.Sleep(5 * time.Millisecond)
+		started, done := j.Started(), j.Done()
+		if started != 1 || done != 0 {
+			t.Error("expected first job started, but not finished, got", started, done)
+		}
+
+		// Verify that the first job completes and second does not run.
+		time.Sleep(25 * time.Millisecond)
+		started, done = j.Started(), j.Done()
+		if started != 1 || done != 1 {
+			t.Error("expected second job skipped, got", started, done)
+		}
+	})
+
+	t.Run("skip 10 jobs on rapid fire", func(*testing.T) {
+		var j countJob
+		j.delay = 10 * time.Millisecond
+		wrappedJob := NewChain(SkipIfStillRunning(DiscardLogger)).Then(&j)
+		for i := 0; i < 11; i++ {
+			go wrappedJob.Run()
+		}
+		time.Sleep(200 * time.Millisecond)
+		done := j.Done()
+		if done != 1 {
+			t.Error("expected 1 jobs executed, 10 jobs dropped, got", done)
+		}
+	})
+
+	t.Run("different jobs independent", func(*testing.T) {
+		var j1, j2 countJob
+		j1.delay = 10 * time.Millisecond
+		j2.delay = 10 * time.Millisecond
+		chain := NewChain(SkipIfStillRunning(DiscardLogger))
+		wrappedJob1 := chain.Then(&j1)
+		wrappedJob2 := chain.Then(&j2)
+		for i := 0; i < 11; i++ {
+			go wrappedJob1.Run()
+			go wrappedJob2.Run()
+		}
+		time.Sleep(100 * time.Millisecond)
+		var (
+			done1 = j1.Done()
+			done2 = j2.Done()
+		)
+		if done1 != 1 || done2 != 1 {
+			t.Error("expected both jobs executed once, got", done1, "and", done2)
+		}
+	})
+}

plugin/cron/constantdelay.go

@@ -0,0 +1,27 @@
+package cron
+
+import "time"
+
+// ConstantDelaySchedule represents a simple recurring duty cycle, e.g. "Every 5 minutes".
+// It does not support jobs more frequent than once a second.
+type ConstantDelaySchedule struct {
+	Delay time.Duration
+}
+
+// Every returns a crontab Schedule that activates once every duration.
+// Delays of less than a second are not supported (will round up to 1 second).
+// Any fields less than a Second are truncated.
+func Every(duration time.Duration) ConstantDelaySchedule {
+	if duration < time.Second {
+		duration = time.Second
+	}
+	return ConstantDelaySchedule{
+		Delay: duration - time.Duration(duration.Nanoseconds())%time.Second,
+	}
+}
+
+// Next returns the next time this should be run.
+// This rounds so that the next activation time will be on the second.
+func (schedule ConstantDelaySchedule) Next(t time.Time) time.Time {
+	return t.Add(schedule.Delay - time.Duration(t.Nanosecond())*time.Nanosecond)
+}

plugin/cron/constantdelay_test.go

@@ -0,0 +1,55 @@
+//nolint:all
+package cron
+
+import (
+	"testing"
+	"time"
+)
+
+func TestConstantDelayNext(t *testing.T) {
+	tests := []struct {
+		time     string
+		delay    time.Duration
+		expected string
+	}{
+		// Simple cases
+		{"Mon Jul 9 14:45 2012", 15*time.Minute + 50*time.Nanosecond, "Mon Jul 9 15:00 2012"},
+		{"Mon Jul 9 14:59 2012", 15 * time.Minute, "Mon Jul 9 15:14 2012"},
+		{"Mon Jul 9 14:59:59 2012", 15 * time.Minute, "Mon Jul 9 15:14:59 2012"},
+
+		// Wrap around hours
+		{"Mon Jul 9 15:45 2012", 35 * time.Minute, "Mon Jul 9 16:20 2012"},
+
+		// Wrap around days
+		{"Mon Jul 9 23:46 2012", 14 * time.Minute, "Tue Jul 10 00:00 2012"},
+		{"Mon Jul 9 23:45 2012", 35 * time.Minute, "Tue Jul 10 00:20 2012"},
+		{"Mon Jul 9 23:35:51 2012", 44*time.Minute + 24*time.Second, "Tue Jul 10 00:20:15 2012"},
+		{"Mon Jul 9 23:35:51 2012", 25*time.Hour + 44*time.Minute + 24*time.Second, "Thu Jul 11 01:20:15 2012"},
+
+		// Wrap around months
+		{"Mon Jul 9 23:35 2012", 91*24*time.Hour + 25*time.Minute, "Thu Oct 9 00:00 2012"},
+
+		// Wrap around minute, hour, day, month, and year
+		{"Mon Dec 31 23:59:45 2012", 15 * time.Second, "Tue Jan 1 00:00:00 2013"},
+
+		// Round to nearest second on the delay
+		{"Mon Jul 9 14:45 2012", 15*time.Minute + 50*time.Nanosecond, "Mon Jul 9 15:00 2012"},
+
+		// Round up to 1 second if the duration is less.
+		{"Mon Jul 9 14:45:00 2012", 15 * time.Millisecond, "Mon Jul 9 14:45:01 2012"},
+
+		// Round to nearest second when calculating the next time.
+		{"Mon Jul 9 14:45:00.005 2012", 15 * time.Minute, "Mon Jul 9 15:00 2012"},
+
+		// Round to nearest second for both.
+		{"Mon Jul 9 14:45:00.005 2012", 15*time.Minute + 50*time.Nanosecond, "Mon Jul 9 15:00 2012"},
+	}
+
+	for _, c := range tests {
+		actual := Every(c.delay).Next(getTime(c.time))
+		expected := getTime(c.expected)
+		if actual != expected {
+			t.Errorf("%s, \"%s\": (expected) %v != %v (actual)", c.time, c.delay, expected, actual)
+		}
+	}
+}

plugin/cron/cron.go

@@ -0,0 +1,353 @@
+package cron
+
+import (
+	"context"
+	"sort"
+	"sync"
+	"time"
+)
+
+// Cron keeps track of any number of entries, invoking the associated func as
+// specified by the schedule. It may be started, stopped, and the entries may
+// be inspected while running.
+type Cron struct {
+	entries   []*Entry
+	chain     Chain
+	stop      chan struct{}
+	add       chan *Entry
+	remove    chan EntryID
+	snapshot  chan chan []Entry
+	running   bool
+	logger    Logger
+	runningMu sync.Mutex
+	location  *time.Location
+	parser    ScheduleParser
+	nextID    EntryID
+	jobWaiter sync.WaitGroup
+}
+
+// ScheduleParser is an interface for schedule spec parsers that return a Schedule.
+type ScheduleParser interface {
+	Parse(spec string) (Schedule, error)
+}
+
+// Job is an interface for submitted cron jobs.
+type Job interface {
+	Run()
+}
+
+// Schedule describes a job's duty cycle.
+type Schedule interface {
+	// Next returns the next activation time, later than the given time.
+	// Next is invoked initially, and then each time the job is run.
+	Next(time.Time) time.Time
+}
+
+// EntryID identifies an entry within a Cron instance.
+type EntryID int
+
+// Entry consists of a schedule and the func to execute on that schedule.
+type Entry struct {
+	// ID is the cron-assigned ID of this entry, which may be used to look up a
+	// snapshot or remove it.
+	ID EntryID
+
+	// Schedule on which this job should be run.
+	Schedule Schedule
+
+	// Next time the job will run, or the zero time if Cron has not been
+	// started or this entry's schedule is unsatisfiable
+	Next time.Time
+
+	// Prev is the last time this job was run, or the zero time if never.
+	Prev time.Time
+
+	// WrappedJob is the thing to run when the Schedule is activated.
+	WrappedJob Job
+
+	// Job is the thing that was submitted to cron.
+	// It is kept around so that user code that needs to get at the job later,
+	// e.g. via Entries() can do so.
+	Job Job
+}
+
+// Valid returns true if this is not the zero entry.
+func (e Entry) Valid() bool { return e.ID != 0 }
+
+// byTime is a wrapper for sorting the entry array by time
+// (with zero time at the end).
+type byTime []*Entry
+
+func (s byTime) Len() int      { return len(s) }
+func (s byTime) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+func (s byTime) Less(i, j int) bool {
+	// Two zero times should return false.
+	// Otherwise, zero is "greater" than any other time.
+	// (To sort it at the end of the list.)
+	if s[i].Next.IsZero() {
+		return false
+	}
+	if s[j].Next.IsZero() {
+		return true
+	}
+	return s[i].Next.Before(s[j].Next)
+}
+
+// New returns a new Cron job runner, modified by the given options.
+//
+// Available Settings
+//
+//	Time Zone
+//	  Description: The time zone in which schedules are interpreted
+//	  Default:     time.Local
+//
+//	Parser
+//	  Description: Parser converts cron spec strings into cron.Schedules.
+//	  Default:     Accepts this spec: https://en.wikipedia.org/wiki/Cron
+//
+//	Chain
+//	  Description: Wrap submitted jobs to customize behavior.
+//	  Default:     A chain that recovers panics and logs them to stderr.
+//
+// See "cron.With*" to modify the default behavior.
+func New(opts ...Option) *Cron {
+	c := &Cron{
+		entries:   nil,
+		chain:     NewChain(),
+		add:       make(chan *Entry),
+		stop:      make(chan struct{}),
+		snapshot:  make(chan chan []Entry),
+		remove:    make(chan EntryID),
+		running:   false,
+		runningMu: sync.Mutex{},
+		logger:    DefaultLogger,
+		location:  time.Local,
+		parser:    standardParser,
+	}
+	for _, opt := range opts {
+		opt(c)
+	}
+	return c
+}
+
+// FuncJob is a wrapper that turns a func() into a cron.Job.
+type FuncJob func()
+
+func (f FuncJob) Run() { f() }
+
+// AddFunc adds a func to the Cron to be run on the given schedule.
+// The spec is parsed using the time zone of this Cron instance as the default.
+// An opaque ID is returned that can be used to later remove it.
+func (c *Cron) AddFunc(spec string, cmd func()) (EntryID, error) {
+	return c.AddJob(spec, FuncJob(cmd))
+}
+
+// AddJob adds a Job to the Cron to be run on the given schedule.
+// The spec is parsed using the time zone of this Cron instance as the default.
+// An opaque ID is returned that can be used to later remove it.
+func (c *Cron) AddJob(spec string, cmd Job) (EntryID, error) {
+	schedule, err := c.parser.Parse(spec)
+	if err != nil {
+		return 0, err
+	}
+	return c.Schedule(schedule, cmd), nil
+}
+
+// Schedule adds a Job to the Cron to be run on the given schedule.
+// The job is wrapped with the configured Chain.
+func (c *Cron) Schedule(schedule Schedule, cmd Job) EntryID {
+	c.runningMu.Lock()
+	defer c.runningMu.Unlock()
+	c.nextID++
+	entry := &Entry{
+		ID:         c.nextID,
+		Schedule:   schedule,
+		WrappedJob: c.chain.Then(cmd),
+		Job:        cmd,
+	}
+	if !c.running {
+		c.entries = append(c.entries, entry)
+	} else {
+		c.add <- entry
+	}
+	return entry.ID
+}
+
+// Entries returns a snapshot of the cron entries.
+func (c *Cron) Entries() []Entry {
+	c.runningMu.Lock()
+	defer c.runningMu.Unlock()
+	if c.running {
+		replyChan := make(chan []Entry, 1)
+		c.snapshot <- replyChan
+		return <-replyChan
+	}
+	return c.entrySnapshot()
+}
+
+// Location gets the time zone location.
+func (c *Cron) Location() *time.Location {
+	return c.location
+}
+
+// Entry returns a snapshot of the given entry, or nil if it couldn't be found.
+func (c *Cron) Entry(id EntryID) Entry {
+	for _, entry := range c.Entries() {
+		if id == entry.ID {
+			return entry
+		}
+	}
+	return Entry{}
+}
+
+// Remove an entry from being run in the future.
+func (c *Cron) Remove(id EntryID) {
+	c.runningMu.Lock()
+	defer c.runningMu.Unlock()
+	if c.running {
+		c.remove <- id
+	} else {
+		c.removeEntry(id)
+	}
+}
+
+// Start the cron scheduler in its own goroutine, or no-op if already started.
+func (c *Cron) Start() {
+	c.runningMu.Lock()
+	defer c.runningMu.Unlock()
+	if c.running {
+		return
+	}
+	c.running = true
+	go c.runScheduler()
+}
+
+// Run the cron scheduler, or no-op if already running.
+func (c *Cron) Run() {
+	c.runningMu.Lock()
+	if c.running {
+		c.runningMu.Unlock()
+		return
+	}
+	c.running = true
+	c.runningMu.Unlock()
+	c.runScheduler()
+}
+
+// runScheduler runs the scheduler.. this is private just due to the need to synchronize
+// access to the 'running' state variable.
+func (c *Cron) runScheduler() {
+	c.logger.Info("start")
+
+	// Figure out the next activation times for each entry.
+	now := c.now()
+	for _, entry := range c.entries {
+		entry.Next = entry.Schedule.Next(now)
+		c.logger.Info("schedule", "now", now, "entry", entry.ID, "next", entry.Next)
+	}
+
+	for {
+		// Determine the next entry to run.
+		sort.Sort(byTime(c.entries))
+
+		var timer *time.Timer
+		if len(c.entries) == 0 || c.entries[0].Next.IsZero() {
+			// If there are no entries yet, just sleep - it still handles new entries
+			// and stop requests.
+			timer = time.NewTimer(100000 * time.Hour)
+		} else {
+			timer = time.NewTimer(c.entries[0].Next.Sub(now))
+		}
+
+		for {
+			select {
+			case now = <-timer.C:
+				now = now.In(c.location)
+				c.logger.Info("wake", "now", now)
+
+				// Run every entry whose next time was less than now
+				for _, e := range c.entries {
+					if e.Next.After(now) || e.Next.IsZero() {
+						break
+					}
+					c.startJob(e.WrappedJob)
+					e.Prev = e.Next
+					e.Next = e.Schedule.Next(now)
+					c.logger.Info("run", "now", now, "entry", e.ID, "next", e.Next)
+				}
+
+			case newEntry := <-c.add:
+				timer.Stop()
+				now = c.now()
+				newEntry.Next = newEntry.Schedule.Next(now)
+				c.entries = append(c.entries, newEntry)
+				c.logger.Info("added", "now", now, "entry", newEntry.ID, "next", newEntry.Next)
+
+			case replyChan := <-c.snapshot:
+				replyChan <- c.entrySnapshot()
+				continue
+
+			case <-c.stop:
+				timer.Stop()
+				c.logger.Info("stop")
+				return
+
+			case id := <-c.remove:
+				timer.Stop()
+				now = c.now()
+				c.removeEntry(id)
+				c.logger.Info("removed", "entry", id)
+			}
+
+			break
+		}
+	}
+}
+
+// startJob runs the given job in a new goroutine.
+func (c *Cron) startJob(j Job) {
+	c.jobWaiter.Go(func() {
+		j.Run()
+	})
+}
+
+// now returns current time in c location.
+func (c *Cron) now() time.Time {
+	return time.Now().In(c.location)
+}
+
+// Stop stops the cron scheduler if it is running; otherwise it does nothing.
+// A context is returned so the caller can wait for running jobs to complete.
+func (c *Cron) Stop() context.Context {
+	c.runningMu.Lock()
+	defer c.runningMu.Unlock()
+	if c.running {
+		c.stop <- struct{}{}
+		c.running = false
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		c.jobWaiter.Wait()
+		cancel()
+	}()
+	return ctx
+}
+
+// entrySnapshot returns a copy of the current cron entry list.
+func (c *Cron) entrySnapshot() []Entry {
+	var entries = make([]Entry, len(c.entries))
+	for i, e := range c.entries {
+		entries[i] = *e
+	}
+	return entries
+}
+
+func (c *Cron) removeEntry(id EntryID) {
+	var entries []*Entry
+	for _, e := range c.entries {
+		if e.ID != id {
+			entries = append(entries, e)
+		}
+	}
+	c.entries = entries
+}

plugin/cron/cron_test.go

@@ -0,0 +1,702 @@
+//nolint:all
+package cron
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+// Many tests schedule a job for every second, and then wait at most a second
+// for it to run.  This amount is just slightly larger than 1 second to
+// compensate for a few milliseconds of runtime.
+const OneSecond = 1*time.Second + 50*time.Millisecond
+
+type syncWriter struct {
+	wr bytes.Buffer
+	m  sync.Mutex
+}
+
+func (sw *syncWriter) Write(data []byte) (n int, err error) {
+	sw.m.Lock()
+	n, err = sw.wr.Write(data)
+	sw.m.Unlock()
+	return
+}
+
+func (sw *syncWriter) String() string {
+	sw.m.Lock()
+	defer sw.m.Unlock()
+	return sw.wr.String()
+}
+
+func newBufLogger(sw *syncWriter) Logger {
+	return PrintfLogger(log.New(sw, "", log.LstdFlags))
+}
+
+func TestFuncPanicRecovery(t *testing.T) {
+	var buf syncWriter
+	cron := New(WithParser(secondParser),
+		WithChain(Recover(newBufLogger(&buf))))
+	cron.Start()
+	defer cron.Stop()
+	cron.AddFunc("* * * * * ?", func() {
+		panic("YOLO")
+	})
+
+	select {
+	case <-time.After(OneSecond):
+		if !strings.Contains(buf.String(), "YOLO") {
+			t.Error("expected a panic to be logged, got none")
+		}
+		return
+	}
+}
+
+type DummyJob struct{}
+
+func (DummyJob) Run() {
+	panic("YOLO")
+}
+
+func TestJobPanicRecovery(t *testing.T) {
+	var job DummyJob
+
+	var buf syncWriter
+	cron := New(WithParser(secondParser),
+		WithChain(Recover(newBufLogger(&buf))))
+	cron.Start()
+	defer cron.Stop()
+	cron.AddJob("* * * * * ?", job)
+
+	select {
+	case <-time.After(OneSecond):
+		if !strings.Contains(buf.String(), "YOLO") {
+			t.Error("expected a panic to be logged, got none")
+		}
+		return
+	}
+}
+
+// Start and stop cron with no entries.
+func TestNoEntries(t *testing.T) {
+	cron := newWithSeconds()
+	cron.Start()
+
+	select {
+	case <-time.After(OneSecond):
+		t.Fatal("expected cron will be stopped immediately")
+	case <-stop(cron):
+	}
+}
+
+// Start, stop, then add an entry. Verify entry doesn't run.
+func TestStopCausesJobsToNotRun(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	cron.Start()
+	cron.Stop()
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+
+	select {
+	case <-time.After(OneSecond):
+		// No job ran!
+	case <-wait(wg):
+		t.Fatal("expected stopped cron does not run any job")
+	}
+}
+
+// Add a job, start cron, expect it runs.
+func TestAddBeforeRunning(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+	cron.Start()
+	defer cron.Stop()
+
+	// Give cron 2 seconds to run our job (which is always activated).
+	select {
+	case <-time.After(OneSecond):
+		t.Fatal("expected job runs")
+	case <-wait(wg):
+	}
+}
+
+// Start cron, add a job, expect it runs.
+func TestAddWhileRunning(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	cron.Start()
+	defer cron.Stop()
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+
+	select {
+	case <-time.After(OneSecond):
+		t.Fatal("expected job runs")
+	case <-wait(wg):
+	}
+}
+
+// Test for #34. Adding a job after calling start results in multiple job invocations
+func TestAddWhileRunningWithDelay(t *testing.T) {
+	cron := newWithSeconds()
+	cron.Start()
+	defer cron.Stop()
+	time.Sleep(5 * time.Second)
+	var calls int64
+	cron.AddFunc("* * * * * *", func() { atomic.AddInt64(&calls, 1) })
+
+	<-time.After(OneSecond)
+	if atomic.LoadInt64(&calls) != 1 {
+		t.Errorf("called %d times, expected 1\n", calls)
+	}
+}
+
+// Add a job, remove a job, start cron, expect nothing runs.
+func TestRemoveBeforeRunning(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	id, _ := cron.AddFunc("* * * * * ?", func() { wg.Done() })
+	cron.Remove(id)
+	cron.Start()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(OneSecond):
+		// Success, shouldn't run
+	case <-wait(wg):
+		t.FailNow()
+	}
+}
+
+// Start cron, add a job, remove it, expect it doesn't run.
+func TestRemoveWhileRunning(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	cron.Start()
+	defer cron.Stop()
+	id, _ := cron.AddFunc("* * * * * ?", func() { wg.Done() })
+	cron.Remove(id)
+
+	select {
+	case <-time.After(OneSecond):
+	case <-wait(wg):
+		t.FailNow()
+	}
+}
+
+// Test timing with Entries.
+func TestSnapshotEntries(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := New()
+	cron.AddFunc("@every 2s", func() { wg.Done() })
+	cron.Start()
+	defer cron.Stop()
+
+	// Cron should fire in 2 seconds. After 1 second, call Entries.
+	select {
+	case <-time.After(OneSecond):
+		cron.Entries()
+	}
+
+	// Even though Entries was called, the cron should fire at the 2 second mark.
+	select {
+	case <-time.After(OneSecond):
+		t.Error("expected job runs at 2 second mark")
+	case <-wait(wg):
+	}
+}
+
+// Test that the entries are correctly sorted.
+// Add a bunch of long-in-the-future entries, and an immediate entry, and ensure
+// that the immediate entry runs immediately.
+// Also: Test that multiple jobs run in the same instant.
+func TestMultipleEntries(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	cron := newWithSeconds()
+	cron.AddFunc("0 0 0 1 1 ?", func() {})
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+	id1, _ := cron.AddFunc("* * * * * ?", func() { t.Fatal() })
+	id2, _ := cron.AddFunc("* * * * * ?", func() { t.Fatal() })
+	cron.AddFunc("0 0 0 31 12 ?", func() {})
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+
+	cron.Remove(id1)
+	cron.Start()
+	cron.Remove(id2)
+	defer cron.Stop()
+
+	select {
+	case <-time.After(OneSecond):
+		t.Error("expected job run in proper order")
+	case <-wait(wg):
+	}
+}
+
+// Test running the same job twice.
+func TestRunningJobTwice(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	cron := newWithSeconds()
+	cron.AddFunc("0 0 0 1 1 ?", func() {})
+	cron.AddFunc("0 0 0 31 12 ?", func() {})
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+
+	cron.Start()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(2 * OneSecond):
+		t.Error("expected job fires 2 times")
+	case <-wait(wg):
+	}
+}
+
+func TestRunningMultipleSchedules(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	cron := newWithSeconds()
+	cron.AddFunc("0 0 0 1 1 ?", func() {})
+	cron.AddFunc("0 0 0 31 12 ?", func() {})
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+	cron.Schedule(Every(time.Minute), FuncJob(func() {}))
+	cron.Schedule(Every(time.Second), FuncJob(func() { wg.Done() }))
+	cron.Schedule(Every(time.Hour), FuncJob(func() {}))
+
+	cron.Start()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(2 * OneSecond):
+		t.Error("expected job fires 2 times")
+	case <-wait(wg):
+	}
+}
+
+// Test that the cron is run in the local time zone (as opposed to UTC).
+func TestLocalTimezone(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	now := time.Now()
+	// FIX: Issue #205
+	// This calculation doesn't work in seconds 58 or 59.
+	// Take the easy way out and sleep.
+	if now.Second() >= 58 {
+		time.Sleep(2 * time.Second)
+		now = time.Now()
+	}
+	spec := fmt.Sprintf("%d,%d %d %d %d %d ?",
+		now.Second()+1, now.Second()+2, now.Minute(), now.Hour(), now.Day(), now.Month())
+
+	cron := newWithSeconds()
+	cron.AddFunc(spec, func() { wg.Done() })
+	cron.Start()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(OneSecond * 2):
+		t.Error("expected job fires 2 times")
+	case <-wait(wg):
+	}
+}
+
+// Test that the cron is run in the given time zone (as opposed to local).
+func TestNonLocalTimezone(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	loc, err := time.LoadLocation("Atlantic/Cape_Verde")
+	if err != nil {
+		fmt.Printf("Failed to load time zone Atlantic/Cape_Verde: %+v", err)
+		t.Fail()
+	}
+
+	now := time.Now().In(loc)
+	// FIX: Issue #205
+	// This calculation doesn't work in seconds 58 or 59.
+	// Take the easy way out and sleep.
+	if now.Second() >= 58 {
+		time.Sleep(2 * time.Second)
+		now = time.Now().In(loc)
+	}
+	spec := fmt.Sprintf("%d,%d %d %d %d %d ?",
+		now.Second()+1, now.Second()+2, now.Minute(), now.Hour(), now.Day(), now.Month())
+
+	cron := New(WithLocation(loc), WithParser(secondParser))
+	cron.AddFunc(spec, func() { wg.Done() })
+	cron.Start()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(OneSecond * 2):
+		t.Error("expected job fires 2 times")
+	case <-wait(wg):
+	}
+}
+
+// Test that calling stop before start silently returns without
+// blocking the stop channel.
+func TestStopWithoutStart(t *testing.T) {
+	cron := New()
+	cron.Stop()
+}
+
+type testJob struct {
+	wg   *sync.WaitGroup
+	name string
+}
+
+func (t testJob) Run() {
+	t.wg.Done()
+}
+
+// Test that adding an invalid job spec returns an error
+func TestInvalidJobSpec(t *testing.T) {
+	cron := New()
+	_, err := cron.AddJob("this will not parse", nil)
+	if err == nil {
+		t.Errorf("expected an error with invalid spec, got nil")
+	}
+}
+
+// Test blocking run method behaves as Start()
+func TestBlockingRun(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	cron.AddFunc("* * * * * ?", func() { wg.Done() })
+
+	var unblockChan = make(chan struct{})
+
+	go func() {
+		cron.Run()
+		close(unblockChan)
+	}()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(OneSecond):
+		t.Error("expected job fires")
+	case <-unblockChan:
+		t.Error("expected that Run() blocks")
+	case <-wait(wg):
+	}
+}
+
+// Test that double-running is a no-op
+func TestStartNoop(t *testing.T) {
+	var tickChan = make(chan struct{}, 2)
+
+	cron := newWithSeconds()
+	cron.AddFunc("* * * * * ?", func() {
+		tickChan <- struct{}{}
+	})
+
+	cron.Start()
+	defer cron.Stop()
+
+	// Wait for the first firing to ensure the runner is going
+	<-tickChan
+
+	cron.Start()
+
+	<-tickChan
+
+	// Fail if this job fires again in a short period, indicating a double-run
+	select {
+	case <-time.After(time.Millisecond):
+	case <-tickChan:
+		t.Error("expected job fires exactly twice")
+	}
+}
+
+// Simple test using Runnables.
+func TestJob(t *testing.T) {
+	wg := &sync.WaitGroup{}
+	wg.Add(1)
+
+	cron := newWithSeconds()
+	cron.AddJob("0 0 0 30 Feb ?", testJob{wg, "job0"})
+	cron.AddJob("0 0 0 1 1 ?", testJob{wg, "job1"})
+	job2, _ := cron.AddJob("* * * * * ?", testJob{wg, "job2"})
+	cron.AddJob("1 0 0 1 1 ?", testJob{wg, "job3"})
+	cron.Schedule(Every(5*time.Second+5*time.Nanosecond), testJob{wg, "job4"})
+	job5 := cron.Schedule(Every(5*time.Minute), testJob{wg, "job5"})
+
+	// Test getting an Entry pre-Start.
+	if actualName := cron.Entry(job2).Job.(testJob).name; actualName != "job2" {
+		t.Error("wrong job retrieved:", actualName)
+	}
+	if actualName := cron.Entry(job5).Job.(testJob).name; actualName != "job5" {
+		t.Error("wrong job retrieved:", actualName)
+	}
+
+	cron.Start()
+	defer cron.Stop()
+
+	select {
+	case <-time.After(OneSecond):
+		t.FailNow()
+	case <-wait(wg):
+	}
+
+	// Ensure the entries are in the right order.
+	expecteds := []string{"job2", "job4", "job5", "job1", "job3", "job0"}
+
+	var actuals []string
+	for _, entry := range cron.Entries() {
+		actuals = append(actuals, entry.Job.(testJob).name)
+	}
+
+	for i, expected := range expecteds {
+		if actuals[i] != expected {
+			t.Fatalf("Jobs not in the right order.  (expected) %s != %s (actual)", expecteds, actuals)
+		}
+	}
+
+	// Test getting Entries.
+	if actualName := cron.Entry(job2).Job.(testJob).name; actualName != "job2" {
+		t.Error("wrong job retrieved:", actualName)
+	}
+	if actualName := cron.Entry(job5).Job.(testJob).name; actualName != "job5" {
+		t.Error("wrong job retrieved:", actualName)
+	}
+}
+
+// Issue #206
+// Ensure that the next run of a job after removing an entry is accurate.
+func TestScheduleAfterRemoval(t *testing.T) {
+	var wg1 sync.WaitGroup
+	var wg2 sync.WaitGroup
+	wg1.Add(1)
+	wg2.Add(1)
+
+	// The first time this job is run, set a timer and remove the other job
+	// 750ms later. Correct behavior would be to still run the job again in
+	// 250ms, but the bug would cause it to run instead 1s later.
+
+	var calls int
+	var mu sync.Mutex
+
+	cron := newWithSeconds()
+	hourJob := cron.Schedule(Every(time.Hour), FuncJob(func() {}))
+	cron.Schedule(Every(time.Second), FuncJob(func() {
+		mu.Lock()
+		defer mu.Unlock()
+		switch calls {
+		case 0:
+			wg1.Done()
+			calls++
+		case 1:
+			time.Sleep(750 * time.Millisecond)
+			cron.Remove(hourJob)
+			calls++
+		case 2:
+			calls++
+			wg2.Done()
+		case 3:
+			panic("unexpected 3rd call")
+		}
+	}))
+
+	cron.Start()
+	defer cron.Stop()
+
+	// the first run might be any length of time 0 - 1s, since the schedule
+	// rounds to the second. wait for the first run to true up.
+	wg1.Wait()
+
+	select {
+	case <-time.After(2 * OneSecond):
+		t.Error("expected job fires 2 times")
+	case <-wait(&wg2):
+	}
+}
+
+type ZeroSchedule struct{}
+
+func (*ZeroSchedule) Next(time.Time) time.Time {
+	return time.Time{}
+}
+
+// Tests that job without time does not run
+func TestJobWithZeroTimeDoesNotRun(t *testing.T) {
+	cron := newWithSeconds()
+	var calls int64
+	cron.AddFunc("* * * * * *", func() { atomic.AddInt64(&calls, 1) })
+	cron.Schedule(new(ZeroSchedule), FuncJob(func() { t.Error("expected zero task will not run") }))
+	cron.Start()
+	defer cron.Stop()
+	<-time.After(OneSecond)
+	if atomic.LoadInt64(&calls) != 1 {
+		t.Errorf("called %d times, expected 1\n", calls)
+	}
+}
+
+func TestStopAndWait(t *testing.T) {
+	t.Run("nothing running, returns immediately", func(*testing.T) {
+		cron := newWithSeconds()
+		cron.Start()
+		ctx := cron.Stop()
+		select {
+		case <-ctx.Done():
+		case <-time.After(time.Millisecond):
+			t.Error("context was not done immediately")
+		}
+	})
+
+	t.Run("repeated calls to Stop", func(*testing.T) {
+		cron := newWithSeconds()
+		cron.Start()
+		_ = cron.Stop()
+		time.Sleep(time.Millisecond)
+		ctx := cron.Stop()
+		select {
+		case <-ctx.Done():
+		case <-time.After(time.Millisecond):
+			t.Error("context was not done immediately")
+		}
+	})
+
+	t.Run("a couple fast jobs added, still returns immediately", func(*testing.T) {
+		cron := newWithSeconds()
+		cron.AddFunc("* * * * * *", func() {})
+		cron.Start()
+		cron.AddFunc("* * * * * *", func() {})
+		cron.AddFunc("* * * * * *", func() {})
+		cron.AddFunc("* * * * * *", func() {})
+		time.Sleep(time.Second)
+		ctx := cron.Stop()
+		select {
+		case <-ctx.Done():
+		case <-time.After(time.Millisecond):
+			t.Error("context was not done immediately")
+		}
+	})
+
+	t.Run("a couple fast jobs and a slow job added, waits for slow job", func(*testing.T) {
+		cron := newWithSeconds()
+		cron.AddFunc("* * * * * *", func() {})
+		cron.Start()
+		cron.AddFunc("* * * * * *", func() { time.Sleep(2 * time.Second) })
+		cron.AddFunc("* * * * * *", func() {})
+		time.Sleep(time.Second)
+
+		ctx := cron.Stop()
+
+		// Verify that it is not done for at least 750ms
+		select {
+		case <-ctx.Done():
+			t.Error("context was done too quickly immediately")
+		case <-time.After(750 * time.Millisecond):
+			// expected, because the job sleeping for 1 second is still running
+		}
+
+		// Verify that it IS done in the next 500ms (giving 250ms buffer)
+		select {
+		case <-ctx.Done():
+			// expected
+		case <-time.After(1500 * time.Millisecond):
+			t.Error("context not done after job should have completed")
+		}
+	})
+
+	t.Run("repeated calls to stop, waiting for completion and after", func(*testing.T) {
+		cron := newWithSeconds()
+		cron.AddFunc("* * * * * *", func() {})
+		cron.AddFunc("* * * * * *", func() { time.Sleep(2 * time.Second) })
+		cron.Start()
+		cron.AddFunc("* * * * * *", func() {})
+		time.Sleep(time.Second)
+		ctx := cron.Stop()
+		ctx2 := cron.Stop()
+
+		// Verify that it is not done for at least 1500ms
+		select {
+		case <-ctx.Done():
+			t.Error("context was done too quickly immediately")
+		case <-ctx2.Done():
+			t.Error("context2 was done too quickly immediately")
+		case <-time.After(1500 * time.Millisecond):
+			// expected, because the job sleeping for 2 seconds is still running
+		}
+
+		// Verify that it IS done in the next 1s (giving 500ms buffer)
+		select {
+		case <-ctx.Done():
+			// expected
+		case <-time.After(time.Second):
+			t.Error("context not done after job should have completed")
+		}
+
+		// Verify that ctx2 is also done.
+		select {
+		case <-ctx2.Done():
+			// expected
+		case <-time.After(time.Millisecond):
+			t.Error("context2 not done even though context1 is")
+		}
+
+		// Verify that a new context retrieved from stop is immediately done.
+		ctx3 := cron.Stop()
+		select {
+		case <-ctx3.Done():
+			// expected
+		case <-time.After(time.Millisecond):
+			t.Error("context not done even when cron Stop is completed")
+		}
+	})
+}
+
+func TestMultiThreadedStartAndStop(t *testing.T) {
+	cron := New()
+	go cron.Run()
+	time.Sleep(2 * time.Millisecond)
+	cron.Stop()
+}
+
+func wait(wg *sync.WaitGroup) chan bool {
+	ch := make(chan bool)
+	go func() {
+		wg.Wait()
+		ch <- true
+	}()
+	return ch
+}
+
+func stop(cron *Cron) chan bool {
+	ch := make(chan bool)
+	go func() {
+		cron.Stop()
+		ch <- true
+	}()
+	return ch
+}
+
+// newWithSeconds returns a Cron with the seconds field enabled.
+func newWithSeconds() *Cron {
+	return New(WithParser(secondParser), WithChain())
+}

plugin/cron/logger.go

@@ -0,0 +1,86 @@
+package cron
+
+import (
+	"io"
+	"log"
+	"os"
+	"strings"
+	"time"
+)
+
+// DefaultLogger is used by Cron if none is specified.
+var DefaultLogger = PrintfLogger(log.New(os.Stdout, "cron: ", log.LstdFlags))
+
+// DiscardLogger can be used by callers to discard all log messages.
+var DiscardLogger = PrintfLogger(log.New(io.Discard, "", 0))
+
+// Logger is the interface used in this package for logging, so that any backend
+// can be plugged in. It is a subset of the github.com/go-logr/logr interface.
+type Logger interface {
+	// Info logs routine messages about cron's operation.
+	Info(msg string, keysAndValues ...interface{})
+	// Error logs an error condition.
+	Error(err error, msg string, keysAndValues ...interface{})
+}
+
+// PrintfLogger wraps a Printf-based logger (such as the standard library "log")
+// into an implementation of the Logger interface which logs errors only.
+func PrintfLogger(l interface{ Printf(string, ...interface{}) }) Logger {
+	return printfLogger{l, false}
+}
+
+// VerbosePrintfLogger wraps a Printf-based logger (such as the standard library
+// "log") into an implementation of the Logger interface which logs everything.
+func VerbosePrintfLogger(l interface{ Printf(string, ...interface{}) }) Logger {
+	return printfLogger{l, true}
+}
+
+type printfLogger struct {
+	logger  interface{ Printf(string, ...interface{}) }
+	logInfo bool
+}
+
+func (pl printfLogger) Info(msg string, keysAndValues ...interface{}) {
+	if pl.logInfo {
+		keysAndValues = formatTimes(keysAndValues)
+		pl.logger.Printf(
+			formatString(len(keysAndValues)),
+			append([]interface{}{msg}, keysAndValues...)...)
+	}
+}
+
+func (pl printfLogger) Error(err error, msg string, keysAndValues ...interface{}) {
+	keysAndValues = formatTimes(keysAndValues)
+	pl.logger.Printf(
+		formatString(len(keysAndValues)+2),
+		append([]interface{}{msg, "error", err}, keysAndValues...)...)
+}
+
+// formatString returns a logfmt-like format string for the number of
+// key/values.
+func formatString(numKeysAndValues int) string {
+	var sb strings.Builder
+	sb.WriteString("%s")
+	if numKeysAndValues > 0 {
+		sb.WriteString(", ")
+	}
+	for i := 0; i < numKeysAndValues/2; i++ {
+		if i > 0 {
+			sb.WriteString(", ")
+		}
+		sb.WriteString("%v=%v")
+	}
+	return sb.String()
+}
+
+// formatTimes formats any time.Time values as RFC3339.
+func formatTimes(keysAndValues []interface{}) []interface{} {
+	var formattedArgs []interface{}
+	for _, arg := range keysAndValues {
+		if t, ok := arg.(time.Time); ok {
+			arg = t.Format(time.RFC3339)
+		}
+		formattedArgs = append(formattedArgs, arg)
+	}
+	return formattedArgs
+}

plugin/cron/option.go

@@ -0,0 +1,45 @@
+package cron
+
+import (
+	"time"
+)
+
+// Option represents a modification to the default behavior of a Cron.
+type Option func(*Cron)
+
+// WithLocation overrides the timezone of the cron instance.
+func WithLocation(loc *time.Location) Option {
+	return func(c *Cron) {
+		c.location = loc
+	}
+}
+
+// WithSeconds overrides the parser used for interpreting job schedules to
+// include a seconds field as the first one.
+func WithSeconds() Option {
+	return WithParser(NewParser(
+		Second | Minute | Hour | Dom | Month | Dow | Descriptor,
+	))
+}
+
+// WithParser overrides the parser used for interpreting job schedules.
+func WithParser(p ScheduleParser) Option {
+	return func(c *Cron) {
+		c.parser = p
+	}
+}
+
+// WithChain specifies Job wrappers to apply to all jobs added to this cron.
+// Refer to the Chain* functions in this package for provided wrappers.
+func WithChain(wrappers ...JobWrapper) Option {
+	return func(c *Cron) {
+		c.chain = NewChain(wrappers...)
+	}
+}
+
+// WithLogger uses the provided logger.
+func WithLogger(logger Logger) Option {
+	return func(c *Cron) {
+		c.logger = logger
+	}
+}

plugin/cron/option_test.go

@@ -0,0 +1,43 @@
+//nolint:all
+package cron
+
+import (
+	"log"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestWithLocation(t *testing.T) {
+	c := New(WithLocation(time.UTC))
+	if c.location != time.UTC {
+		t.Errorf("expected UTC, got %v", c.location)
+	}
+}
+
+func TestWithParser(t *testing.T) {
+	var parser = NewParser(Dow)
+	c := New(WithParser(parser))
+	if c.parser != parser {
+		t.Error("expected provided parser")
+	}
+}
+
+func TestWithVerboseLogger(t *testing.T) {
+	var buf syncWriter
+	var logger = log.New(&buf, "", log.LstdFlags)
+	c := New(WithLogger(VerbosePrintfLogger(logger)))
+	if c.logger.(printfLogger).logger != logger {
+		t.Error("expected provided logger")
+	}
+
+	c.AddFunc("@every 1s", func() {})
+	c.Start()
+	time.Sleep(OneSecond)
+	c.Stop()
+	out := buf.String()
+	if !strings.Contains(out, "schedule,") ||
+		!strings.Contains(out, "run,") {
+		t.Error("expected to see some actions, got:", out)
+	}
+}

plugin/cron/parser.go

@@ -0,0 +1,437 @@
+package cron
+
+import (
+	"math"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+// Configuration options for creating a parser. Most options specify which
+// fields should be included, while others enable features. If a field is not
+// included the parser will assume a default value. These options do not change
+// the order fields are parse in.
+type ParseOption int
+
+const (
+	Second         ParseOption = 1 << iota // Seconds field, default 0
+	SecondOptional                         // Optional seconds field, default 0
+	Minute                                 // Minutes field, default 0
+	Hour                                   // Hours field, default 0
+	Dom                                    // Day of month field, default *
+	Month                                  // Month field, default *
+	Dow                                    // Day of week field, default *
+	DowOptional                            // Optional day of week field, default *
+	Descriptor                             // Allow descriptors such as @monthly, @weekly, etc.
+)
+
+var places = []ParseOption{
+	Second,
+	Minute,
+	Hour,
+	Dom,
+	Month,
+	Dow,
+}
+
+var defaults = []string{
+	"0",
+	"0",
+	"0",
+	"*",
+	"*",
+	"*",
+}
+
+// A custom Parser that can be configured.
+type Parser struct {
+	options ParseOption
+}
+
+// NewParser creates a Parser with custom options.
+//
+// It panics if more than one Optional is given, since it would be impossible to
+// correctly infer which optional is provided or missing in general.
+//
+// Examples
+//
+//	// Standard parser without descriptors
+//	specParser := NewParser(Minute | Hour | Dom | Month | Dow)
+//	sched, err := specParser.Parse("0 0 15 */3 *")
+//
+//	// Same as above, just excludes time fields
+//	specParser := NewParser(Dom | Month | Dow)
+//	sched, err := specParser.Parse("15 */3 *")
+//
+//	// Same as above, just makes Dow optional
+//	specParser := NewParser(Dom | Month | DowOptional)
+//	sched, err := specParser.Parse("15 */3")
+func NewParser(options ParseOption) Parser {
+	optionals := 0
+	if options&DowOptional > 0 {
+		optionals++
+	}
+	if options&SecondOptional > 0 {
+		optionals++
+	}
+	if optionals > 1 {
+		panic("multiple optionals may not be configured")
+	}
+	return Parser{options}
+}
+
+// Parse returns a new crontab schedule representing the given spec.
+// It returns a descriptive error if the spec is not valid.
+// It accepts crontab specs and features configured by NewParser.
+func (p Parser) Parse(spec string) (Schedule, error) {
+	if len(spec) == 0 {
+		return nil, errors.New("empty spec string")
+	}
+
+	// Extract timezone if present
+	var loc = time.Local
+	if strings.HasPrefix(spec, "TZ=") || strings.HasPrefix(spec, "CRON_TZ=") {
+		var err error
+		i := strings.Index(spec, " ")
+		eq := strings.Index(spec, "=")
+		if loc, err = time.LoadLocation(spec[eq+1 : i]); err != nil {
+			return nil, errors.Wrap(err, "provided bad location")
+		}
+		spec = strings.TrimSpace(spec[i:])
+	}
+
+	// Handle named schedules (descriptors), if configured
+	if strings.HasPrefix(spec, "@") {
+		if p.options&Descriptor == 0 {
+			return nil, errors.New("descriptors not enabled")
+		}
+		return parseDescriptor(spec, loc)
+	}
+
+	// Split on whitespace.
+	fields := strings.Fields(spec)
+
+	// Validate & fill in any omitted or optional fields
+	var err error
+	fields, err = normalizeFields(fields, p.options)
+	if err != nil {
+		return nil, err
+	}
+
+	field := func(field string, r bounds) uint64 {
+		if err != nil {
+			return 0
+		}
+		var bits uint64
+		bits, err = getField(field, r)
+		return bits
+	}
+
+	var (
+		second     = field(fields[0], seconds)
+		minute     = field(fields[1], minutes)
+		hour       = field(fields[2], hours)
+		dayofmonth = field(fields[3], dom)
+		month      = field(fields[4], months)
+		dayofweek  = field(fields[5], dow)
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &SpecSchedule{
+		Second:   second,
+		Minute:   minute,
+		Hour:     hour,
+		Dom:      dayofmonth,
+		Month:    month,
+		Dow:      dayofweek,
+		Location: loc,
+	}, nil
+}
+
+// normalizeFields takes a subset set of the time fields and returns the full set
+// with defaults (zeroes) populated for unset fields.
+//
+// As part of performing this function, it also validates that the provided
+// fields are compatible with the configured options.
+func normalizeFields(fields []string, options ParseOption) ([]string, error) {
+	// Validate optionals & add their field to options
+	optionals := 0
+	if options&SecondOptional > 0 {
+		options |= Second
+		optionals++
+	}
+	if options&DowOptional > 0 {
+		options |= Dow
+		optionals++
+	}
+	if optionals > 1 {
+		return nil, errors.New("multiple optionals may not be configured")
+	}
+
+	// Figure out how many fields we need
+	max := 0
+	for _, place := range places {
+		if options&place > 0 {
+			max++
+		}
+	}
+	min := max - optionals
+
+	// Validate number of fields
+	if count := len(fields); count < min || count > max {
+		if min == max {
+			return nil, errors.New("incorrect number of fields")
+		}
+		return nil, errors.New("incorrect number of fields, expected " + strconv.Itoa(min) + "-" + strconv.Itoa(max))
+	}
+
+	// Populate the optional field if not provided
+	if min < max && len(fields) == min {
+		switch {
+		case options&DowOptional > 0:
+			fields = append(fields, defaults[5]) // TODO: improve access to default
+		case options&SecondOptional > 0:
+			fields = append([]string{defaults[0]}, fields...)
+		default:
+			return nil, errors.New("unexpected optional field")
+		}
+	}
+
+	// Populate all fields not part of options with their defaults
+	n := 0
+	expandedFields := make([]string, len(places))
+	copy(expandedFields, defaults)
+	for i, place := range places {
+		if options&place > 0 {
+			expandedFields[i] = fields[n]
+			n++
+		}
+	}
+	return expandedFields, nil
+}
+
+var standardParser = NewParser(
+	Minute | Hour | Dom | Month | Dow | Descriptor,
+)
+
+// ParseStandard returns a new crontab schedule representing the given
+// standardSpec (https://en.wikipedia.org/wiki/Cron). It requires 5 entries
+// representing: minute, hour, day of month, month and day of week, in that
+// order. It returns a descriptive error if the spec is not valid.
+//
+// It accepts
+//   - Standard crontab specs, e.g. "* * * * ?"
+//   - Descriptors, e.g. "@midnight", "@every 1h30m"
+func ParseStandard(standardSpec string) (Schedule, error) {
+	return standardParser.Parse(standardSpec)
+}
+
+// getField returns an Int with the bits set representing all of the times that
+// the field represents or error parsing field value.  A "field" is a comma-separated
+// list of "ranges".
+func getField(field string, r bounds) (uint64, error) {
+	var bits uint64
+	ranges := strings.FieldsFunc(field, func(r rune) bool { return r == ',' })
+	for _, expr := range ranges {
+		bit, err := getRange(expr, r)
+		if err != nil {
+			return bits, err
+		}
+		bits |= bit
+	}
+	return bits, nil
+}
+
+// getRange returns the bits indicated by the given expression:
+//
+//	number | number "-" number [ "/" number ]
+//
+// or error parsing range.
+func getRange(expr string, r bounds) (uint64, error) {
+	var (
+		start, end, step uint
+		rangeAndStep     = strings.Split(expr, "/")
+		lowAndHigh       = strings.Split(rangeAndStep[0], "-")
+		singleDigit      = len(lowAndHigh) == 1
+		err              error
+	)
+
+	var extra uint64
+	if lowAndHigh[0] == "*" || lowAndHigh[0] == "?" {
+		start = r.min
+		end = r.max
+		extra = starBit
+	} else {
+		start, err = parseIntOrName(lowAndHigh[0], r.names)
+		if err != nil {
+			return 0, err
+		}
+		switch len(lowAndHigh) {
+		case 1:
+			end = start
+		case 2:
+			end, err = parseIntOrName(lowAndHigh[1], r.names)
+			if err != nil {
+				return 0, err
+			}
+		default:
+			return 0, errors.New("too many hyphens: " + expr)
+		}
+	}
+
+	switch len(rangeAndStep) {
+	case 1:
+		step = 1
+	case 2:
+		step, err = mustParseInt(rangeAndStep[1])
+		if err != nil {
+			return 0, err
+		}
+
+		// Special handling: "N/step" means "N-max/step".
+		if singleDigit {
+			end = r.max
+		}
+		if step > 1 {
+			extra = 0
+		}
+	default:
+		return 0, errors.New("too many slashes: " + expr)
+	}
+
+	if start < r.min {
+		return 0, errors.New("beginning of range below minimum: " + expr)
+	}
+	if end > r.max {
+		return 0, errors.New("end of range above maximum: " + expr)
+	}
+	if start > end {
+		return 0, errors.New("beginning of range after end: " + expr)
+	}
+	if step == 0 {
+		return 0, errors.New("step cannot be zero: " + expr)
+	}
+
+	return getBits(start, end, step) | extra, nil
+}
+
+// parseIntOrName returns the (possibly-named) integer contained in expr.
+func parseIntOrName(expr string, names map[string]uint) (uint, error) {
+	if names != nil {
+		if namedInt, ok := names[strings.ToLower(expr)]; ok {
+			return namedInt, nil
+		}
+	}
+	return mustParseInt(expr)
+}
+
+// mustParseInt parses the given expression as an int or returns an error.
+func mustParseInt(expr string) (uint, error) {
+	num, err := strconv.Atoi(expr)
+	if err != nil {
+		return 0, errors.Wrap(err, "failed to parse number")
+	}
+	if num < 0 {
+		return 0, errors.New("number must be positive")
+	}
+
+	return uint(num), nil
+}
+
+// getBits sets all bits in the range [min, max], modulo the given step size.
+func getBits(min, max, step uint) uint64 {
+	var bits uint64
+
+	// If step is 1, use shifts.
+	if step == 1 {
+		return ^(math.MaxUint64 << (max + 1)) & (math.MaxUint64 << min)
+	}
+
+	// Else, use a simple loop.
+	for i := min; i <= max; i += step {
+		bits |= 1 << i
+	}
+	return bits
+}
+
+// all returns all bits within the given bounds.
+func all(r bounds) uint64 {
+	return getBits(r.min, r.max, 1) | starBit
+}
+
+// parseDescriptor returns a predefined schedule for the expression, or error if none matches.
+func parseDescriptor(descriptor string, loc *time.Location) (Schedule, error) {
+	switch descriptor {
+	case "@yearly", "@annually":
+		return &SpecSchedule{
+			Second:   1 << seconds.min,
+			Minute:   1 << minutes.min,
+			Hour:     1 << hours.min,
+			Dom:      1 << dom.min,
+			Month:    1 << months.min,
+			Dow:      all(dow),
+			Location: loc,
+		}, nil
+
+	case "@monthly":
+		return &SpecSchedule{
+			Second:   1 << seconds.min,
+			Minute:   1 << minutes.min,
+			Hour:     1 << hours.min,
+			Dom:      1 << dom.min,
+			Month:    all(months),
+			Dow:      all(dow),
+			Location: loc,
+		}, nil
+
+	case "@weekly":
+		return &SpecSchedule{
+			Second:   1 << seconds.min,
+			Minute:   1 << minutes.min,
+			Hour:     1 << hours.min,
+			Dom:      all(dom),
+			Month:    all(months),
+			Dow:      1 << dow.min,
+			Location: loc,
+		}, nil
+
+	case "@daily", "@midnight":
+		return &SpecSchedule{
+			Second:   1 << seconds.min,
+			Minute:   1 << minutes.min,
+			Hour:     1 << hours.min,
+			Dom:      all(dom),
+			Month:    all(months),
+			Dow:      all(dow),
+			Location: loc,
+		}, nil
+
+	case "@hourly":
+		return &SpecSchedule{
+			Second:   1 << seconds.min,
+			Minute:   1 << minutes.min,
+			Hour:     all(hours),
+			Dom:      all(dom),
+			Month:    all(months),
+			Dow:      all(dow),
+			Location: loc,
+		}, nil
+	default:
+		// Continue to check @every prefix below
+	}
+
+	const every = "@every "
+	if strings.HasPrefix(descriptor, every) {
+		duration, err := time.ParseDuration(descriptor[len(every):])
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to parse duration")
+		}
+		return Every(duration), nil
+	}
+
+	return nil, errors.New("unrecognized descriptor: " + descriptor)
+}

plugin/cron/parser_test.go

@@ -0,0 +1,384 @@
+//nolint:all
+package cron
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+)
+
+var secondParser = NewParser(Second | Minute | Hour | Dom | Month | DowOptional | Descriptor)
+
+func TestRange(t *testing.T) {
+	zero := uint64(0)
+	ranges := []struct {
+		expr     string
+		min, max uint
+		expected uint64
+		err      string
+	}{
+		{"5", 0, 7, 1 << 5, ""},
+		{"0", 0, 7, 1 << 0, ""},
+		{"7", 0, 7, 1 << 7, ""},
+
+		{"5-5", 0, 7, 1 << 5, ""},
+		{"5-6", 0, 7, 1<<5 | 1<<6, ""},
+		{"5-7", 0, 7, 1<<5 | 1<<6 | 1<<7, ""},
+
+		{"5-6/2", 0, 7, 1 << 5, ""},
+		{"5-7/2", 0, 7, 1<<5 | 1<<7, ""},
+		{"5-7/1", 0, 7, 1<<5 | 1<<6 | 1<<7, ""},
+
+		{"*", 1, 3, 1<<1 | 1<<2 | 1<<3 | starBit, ""},
+		{"*/2", 1, 3, 1<<1 | 1<<3, ""},
+
+		{"5--5", 0, 0, zero, "too many hyphens"},
+		{"jan-x", 0, 0, zero, `failed to parse number: strconv.Atoi: parsing "jan": invalid syntax`},
+		{"2-x", 1, 5, zero, `failed to parse number: strconv.Atoi: parsing "x": invalid syntax`},
+		{"*/-12", 0, 0, zero, "number must be positive"},
+		{"*//2", 0, 0, zero, "too many slashes"},
+		{"1", 3, 5, zero, "below minimum"},
+		{"6", 3, 5, zero, "above maximum"},
+		{"5-3", 3, 5, zero, "beginning of range after end: 5-3"},
+		{"*/0", 0, 0, zero, "step cannot be zero: */0"},
+	}
+
+	for _, c := range ranges {
+		actual, err := getRange(c.expr, bounds{c.min, c.max, nil})
+		if len(c.err) != 0 && (err == nil || !strings.Contains(err.Error(), c.err)) {
+			t.Errorf("%s => expected %v, got %v", c.expr, c.err, err)
+		}
+		if len(c.err) == 0 && err != nil {
+			t.Errorf("%s => unexpected error %v", c.expr, err)
+		}
+		if actual != c.expected {
+			t.Errorf("%s => expected %d, got %d", c.expr, c.expected, actual)
+		}
+	}
+}
+
+func TestField(t *testing.T) {
+	fields := []struct {
+		expr     string
+		min, max uint
+		expected uint64
+	}{
+		{"5", 1, 7, 1 << 5},
+		{"5,6", 1, 7, 1<<5 | 1<<6},
+		{"5,6,7", 1, 7, 1<<5 | 1<<6 | 1<<7},
+		{"1,5-7/2,3", 1, 7, 1<<1 | 1<<5 | 1<<7 | 1<<3},
+	}
+
+	for _, c := range fields {
+		actual, _ := getField(c.expr, bounds{c.min, c.max, nil})
+		if actual != c.expected {
+			t.Errorf("%s => expected %d, got %d", c.expr, c.expected, actual)
+		}
+	}
+}
+
+func TestAll(t *testing.T) {
+	allBits := []struct {
+		r        bounds
+		expected uint64
+	}{
+		{minutes, 0xfffffffffffffff}, // 0-59: 60 ones
+		{hours, 0xffffff},            // 0-23: 24 ones
+		{dom, 0xfffffffe},            // 1-31: 31 ones, 1 zero
+		{months, 0x1ffe},             // 1-12: 12 ones, 1 zero
+		{dow, 0x7f},                  // 0-6: 7 ones
+	}
+
+	for _, c := range allBits {
+		actual := all(c.r) // all() adds the starBit, so compensate for that..
+		if c.expected|starBit != actual {
+			t.Errorf("%d-%d/%d => expected %b, got %b",
+				c.r.min, c.r.max, 1, c.expected|starBit, actual)
+		}
+	}
+}
+
+func TestBits(t *testing.T) {
+	bits := []struct {
+		min, max, step uint
+		expected       uint64
+	}{
+		{0, 0, 1, 0x1},
+		{1, 1, 1, 0x2},
+		{1, 5, 2, 0x2a}, // 101010
+		{1, 4, 2, 0xa},  // 1010
+	}
+
+	for _, c := range bits {
+		actual := getBits(c.min, c.max, c.step)
+		if c.expected != actual {
+			t.Errorf("%d-%d/%d => expected %b, got %b",
+				c.min, c.max, c.step, c.expected, actual)
+		}
+	}
+}
+
+func TestParseScheduleErrors(t *testing.T) {
+	var tests = []struct{ expr, err string }{
+		{"* 5 j * * *", `failed to parse number: strconv.Atoi: parsing "j": invalid syntax`},
+		{"@every Xm", "failed to parse duration"},
+		{"@unrecognized", "unrecognized descriptor"},
+		{"* * * *", "incorrect number of fields, expected 5-6"},
+		{"", "empty spec string"},
+	}
+	for _, c := range tests {
+		actual, err := secondParser.Parse(c.expr)
+		if err == nil || !strings.Contains(err.Error(), c.err) {
+			t.Errorf("%s => expected %v, got %v", c.expr, c.err, err)
+		}
+		if actual != nil {
+			t.Errorf("expected nil schedule on error, got %v", actual)
+		}
+	}
+}
+
+func TestParseSchedule(t *testing.T) {
+	tokyo, _ := time.LoadLocation("Asia/Tokyo")
+	entries := []struct {
+		parser   Parser
+		expr     string
+		expected Schedule
+	}{
+		{secondParser, "0 5 * * * *", every5min(time.Local)},
+		{standardParser, "5 * * * *", every5min(time.Local)},
+		{secondParser, "CRON_TZ=UTC  0 5 * * * *", every5min(time.UTC)},
+		{standardParser, "CRON_TZ=UTC  5 * * * *", every5min(time.UTC)},
+		{secondParser, "CRON_TZ=Asia/Tokyo 0 5 * * * *", every5min(tokyo)},
+		{secondParser, "@every 5m", ConstantDelaySchedule{5 * time.Minute}},
+		{secondParser, "@midnight", midnight(time.Local)},
+		{secondParser, "TZ=UTC  @midnight", midnight(time.UTC)},
+		{secondParser, "TZ=Asia/Tokyo @midnight", midnight(tokyo)},
+		{secondParser, "@yearly", annual(time.Local)},
+		{secondParser, "@annually", annual(time.Local)},
+		{
+			parser: secondParser,
+			expr:   "* 5 * * * *",
+			expected: &SpecSchedule{
+				Second:   all(seconds),
+				Minute:   1 << 5,
+				Hour:     all(hours),
+				Dom:      all(dom),
+				Month:    all(months),
+				Dow:      all(dow),
+				Location: time.Local,
+			},
+		},
+	}
+
+	for _, c := range entries {
+		actual, err := c.parser.Parse(c.expr)
+		if err != nil {
+			t.Errorf("%s => unexpected error %v", c.expr, err)
+		}
+		if !reflect.DeepEqual(actual, c.expected) {
+			t.Errorf("%s => expected %b, got %b", c.expr, c.expected, actual)
+		}
+	}
+}
+
+func TestOptionalSecondSchedule(t *testing.T) {
+	parser := NewParser(SecondOptional | Minute | Hour | Dom | Month | Dow | Descriptor)
+	entries := []struct {
+		expr     string
+		expected Schedule
+	}{
+		{"0 5 * * * *", every5min(time.Local)},
+		{"5 5 * * * *", every5min5s(time.Local)},
+		{"5 * * * *", every5min(time.Local)},
+	}
+
+	for _, c := range entries {
+		actual, err := parser.Parse(c.expr)
+		if err != nil {
+			t.Errorf("%s => unexpected error %v", c.expr, err)
+		}
+		if !reflect.DeepEqual(actual, c.expected) {
+			t.Errorf("%s => expected %b, got %b", c.expr, c.expected, actual)
+		}
+	}
+}
+
+func TestNormalizeFields(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    []string
+		options  ParseOption
+		expected []string
+	}{
+		{
+			"AllFields_NoOptional",
+			[]string{"0", "5", "*", "*", "*", "*"},
+			Second | Minute | Hour | Dom | Month | Dow | Descriptor,
+			[]string{"0", "5", "*", "*", "*", "*"},
+		},
+		{
+			"AllFields_SecondOptional_Provided",
+			[]string{"0", "5", "*", "*", "*", "*"},
+			SecondOptional | Minute | Hour | Dom | Month | Dow | Descriptor,
+			[]string{"0", "5", "*", "*", "*", "*"},
+		},
+		{
+			"AllFields_SecondOptional_NotProvided",
+			[]string{"5", "*", "*", "*", "*"},
+			SecondOptional | Minute | Hour | Dom | Month | Dow | Descriptor,
+			[]string{"0", "5", "*", "*", "*", "*"},
+		},
+		{
+			"SubsetFields_NoOptional",
+			[]string{"5", "15", "*"},
+			Hour | Dom | Month,
+			[]string{"0", "0", "5", "15", "*", "*"},
+		},
+		{
+			"SubsetFields_DowOptional_Provided",
+			[]string{"5", "15", "*", "4"},
+			Hour | Dom | Month | DowOptional,
+			[]string{"0", "0", "5", "15", "*", "4"},
+		},
+		{
+			"SubsetFields_DowOptional_NotProvided",
+			[]string{"5", "15", "*"},
+			Hour | Dom | Month | DowOptional,
+			[]string{"0", "0", "5", "15", "*", "*"},
+		},
+		{
+			"SubsetFields_SecondOptional_NotProvided",
+			[]string{"5", "15", "*"},
+			SecondOptional | Hour | Dom | Month,
+			[]string{"0", "0", "5", "15", "*", "*"},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(*testing.T) {
+			actual, err := normalizeFields(test.input, test.options)
+			if err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+			if !reflect.DeepEqual(actual, test.expected) {
+				t.Errorf("expected %v, got %v", test.expected, actual)
+			}
+		})
+	}
+}
+
+func TestNormalizeFields_Errors(t *testing.T) {
+	tests := []struct {
+		name    string
+		input   []string
+		options ParseOption
+		err     string
+	}{
+		{
+			"TwoOptionals",
+			[]string{"0", "5", "*", "*", "*", "*"},
+			SecondOptional | Minute | Hour | Dom | Month | DowOptional,
+			"",
+		},
+		{
+			"TooManyFields",
+			[]string{"0", "5", "*", "*"},
+			SecondOptional | Minute | Hour,
+			"",
+		},
+		{
+			"NoFields",
+			[]string{},
+			SecondOptional | Minute | Hour,
+			"",
+		},
+		{
+			"TooFewFields",
+			[]string{"*"},
+			SecondOptional | Minute | Hour,
+			"",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(*testing.T) {
+			actual, err := normalizeFields(test.input, test.options)
+			if err == nil {
+				t.Errorf("expected an error, got none. results: %v", actual)
+			}
+			if !strings.Contains(err.Error(), test.err) {
+				t.Errorf("expected error %q, got %q", test.err, err.Error())
+			}
+		})
+	}
+}
+
+func TestStandardSpecSchedule(t *testing.T) {
+	entries := []struct {
+		expr     string
+		expected Schedule
+		err      string
+	}{
+		{
+			expr:     "5 * * * *",
+			expected: &SpecSchedule{1 << seconds.min, 1 << 5, all(hours), all(dom), all(months), all(dow), time.Local},
+		},
+		{
+			expr:     "@every 5m",
+			expected: ConstantDelaySchedule{time.Duration(5) * time.Minute},
+		},
+		{
+			expr: "5 j * * *",
+			err:  `failed to parse number: strconv.Atoi: parsing "j": invalid syntax`,
+		},
+		{
+			expr: "* * * *",
+			err:  "incorrect number of fields",
+		},
+	}
+
+	for _, c := range entries {
+		actual, err := ParseStandard(c.expr)
+		if len(c.err) != 0 && (err == nil || !strings.Contains(err.Error(), c.err)) {
+			t.Errorf("%s => expected %v, got %v", c.expr, c.err, err)
+		}
+		if len(c.err) == 0 && err != nil {
+			t.Errorf("%s => unexpected error %v", c.expr, err)
+		}
+		if !reflect.DeepEqual(actual, c.expected) {
+			t.Errorf("%s => expected %b, got %b", c.expr, c.expected, actual)
+		}
+	}
+}
+
+func TestNoDescriptorParser(t *testing.T) {
+	parser := NewParser(Minute | Hour)
+	_, err := parser.Parse("@every 1m")
+	if err == nil {
+		t.Error("expected an error, got none")
+	}
+}
+
+func every5min(loc *time.Location) *SpecSchedule {
+	return &SpecSchedule{1 << 0, 1 << 5, all(hours), all(dom), all(months), all(dow), loc}
+}
+
+func every5min5s(loc *time.Location) *SpecSchedule {
+	return &SpecSchedule{1 << 5, 1 << 5, all(hours), all(dom), all(months), all(dow), loc}
+}
+
+func midnight(loc *time.Location) *SpecSchedule {
+	return &SpecSchedule{1, 1, 1, all(dom), all(months), all(dow), loc}
+}
+
+func annual(loc *time.Location) *SpecSchedule {
+	return &SpecSchedule{
+		Second:   1 << seconds.min,
+		Minute:   1 << minutes.min,
+		Hour:     1 << hours.min,
+		Dom:      1 << dom.min,
+		Month:    1 << months.min,
+		Dow:      all(dow),
+		Location: loc,
+	}
+}

plugin/cron/spec.go

@@ -0,0 +1,188 @@
+package cron
+
+import "time"
+
+// SpecSchedule specifies a duty cycle (to the second granularity), based on a
+// traditional crontab specification. It is computed initially and stored as bit sets.
+type SpecSchedule struct {
+	Second, Minute, Hour, Dom, Month, Dow uint64
+
+	// Override location for this schedule.
+	Location *time.Location
+}
+
+// bounds provides a range of acceptable values (plus a map of name to value).
+type bounds struct {
+	min, max uint
+	names    map[string]uint
+}
+
+// The bounds for each field.
+var (
+	seconds = bounds{0, 59, nil}
+	minutes = bounds{0, 59, nil}
+	hours   = bounds{0, 23, nil}
+	dom     = bounds{1, 31, nil}
+	months  = bounds{1, 12, map[string]uint{
+		"jan": 1,
+		"feb": 2,
+		"mar": 3,
+		"apr": 4,
+		"may": 5,
+		"jun": 6,
+		"jul": 7,
+		"aug": 8,
+		"sep": 9,
+		"oct": 10,
+		"nov": 11,
+		"dec": 12,
+	}}
+	dow = bounds{0, 6, map[string]uint{
+		"sun": 0,
+		"mon": 1,
+		"tue": 2,
+		"wed": 3,
+		"thu": 4,
+		"fri": 5,
+		"sat": 6,
+	}}
+)
+
+const (
+	// Set the top bit if a star was included in the expression.
+	starBit = 1 << 63
+)
+
+// Next returns the next time this schedule is activated, greater than the given
+// time.  If no time can be found to satisfy the schedule, return the zero time.
+func (s *SpecSchedule) Next(t time.Time) time.Time {
+	// General approach
+	//
+	// For Month, Day, Hour, Minute, Second:
+	// Check if the time value matches.  If yes, continue to the next field.
+	// If the field doesn't match the schedule, then increment the field until it matches.
+	// While incrementing the field, a wrap-around brings it back to the beginning
+	// of the field list (since it is necessary to re-verify previous field
+	// values)
+
+	// Convert the given time into the schedule's timezone, if one is specified.
+	// Save the original timezone so we can convert back after we find a time.
+	// Note that schedules without a time zone specified (time.Local) are treated
+	// as local to the time provided.
+	origLocation := t.Location()
+	loc := s.Location
+	if loc == time.Local {
+		loc = t.Location()
+	}
+	if s.Location != time.Local {
+		t = t.In(s.Location)
+	}
+
+	// Start at the earliest possible time (the upcoming second).
+	t = t.Add(1*time.Second - time.Duration(t.Nanosecond())*time.Nanosecond)
+
+	// This flag indicates whether a field has been incremented.
+	added := false
+
+	// If no time is found within five years, return zero.
+	yearLimit := t.Year() + 5
+
+WRAP:
+	if t.Year() > yearLimit {
+		return time.Time{}
+	}
+
+	// Find the first applicable month.
+	// If it's this month, then do nothing.
+	for 1<<uint(t.Month())&s.Month == 0 {
+		// If we have to add a month, reset the other parts to 0.
+		if !added {
+			added = true
+			// Otherwise, set the date at the beginning (since the current time is irrelevant).
+			t = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, loc)
+		}
+		t = t.AddDate(0, 1, 0)
+
+		// Wrapped around.
+		if t.Month() == time.January {
+			goto WRAP
+		}
+	}
+
+	// Now get a day in that month.
+	//
+	// NOTE: This causes issues for daylight savings regimes where midnight does
+	// not exist.  For example: Sao Paulo has DST that transforms midnight on
+	// 11/3 into 1am. Handle that by noticing when the Hour ends up != 0.
+	for !dayMatches(s, t) {
+		if !added {
+			added = true
+			t = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, loc)
+		}
+		t = t.AddDate(0, 0, 1)
+		// Notice if the hour is no longer midnight due to DST.
+		// Add an hour if it's 23, subtract an hour if it's 1.
+		if t.Hour() != 0 {
+			if t.Hour() > 12 {
+				t = t.Add(time.Duration(24-t.Hour()) * time.Hour)
+			} else {
+				t = t.Add(time.Duration(-t.Hour()) * time.Hour)
+			}
+		}
+
+		if t.Day() == 1 {
+			goto WRAP
+		}
+	}
+
+	for 1<<uint(t.Hour())&s.Hour == 0 {
+		if !added {
+			added = true
+			t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), 0, 0, 0, loc)
+		}
+		t = t.Add(1 * time.Hour)
+
+		if t.Hour() == 0 {
+			goto WRAP
+		}
+	}
+
+	for 1<<uint(t.Minute())&s.Minute == 0 {
+		if !added {
+			added = true
+			t = t.Truncate(time.Minute)
+		}
+		t = t.Add(1 * time.Minute)
+
+		if t.Minute() == 0 {
+			goto WRAP
+		}
+	}
+
+	for 1<<uint(t.Second())&s.Second == 0 {
+		if !added {
+			added = true
+			t = t.Truncate(time.Second)
+		}
+		t = t.Add(1 * time.Second)
+
+		if t.Second() == 0 {
+			goto WRAP
+		}
+	}
+
+	return t.In(origLocation)
+}
+
+// dayMatches returns true if the schedule's day-of-week and day-of-month
+// restrictions are satisfied by the given time.
+func dayMatches(s *SpecSchedule, t time.Time) bool {
+	var (
+		domMatch = 1<<uint(t.Day())&s.Dom > 0
+		dowMatch = 1<<uint(t.Weekday())&s.Dow > 0
+	)
+	if s.Dom&starBit > 0 || s.Dow&starBit > 0 {
+		return domMatch && dowMatch
+	}
+	return domMatch || dowMatch
+}

plugin/cron/spec_test.go

@@ -0,0 +1,301 @@
+//nolint:all
+package cron
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestActivation(t *testing.T) {
+	tests := []struct {
+		time, spec string
+		expected   bool
+	}{
+		// Every fifteen minutes.
+		{"Mon Jul 9 15:00 2012", "0/15 * * * *", true},
+		{"Mon Jul 9 15:45 2012", "0/15 * * * *", true},
+		{"Mon Jul 9 15:40 2012", "0/15 * * * *", false},
+
+		// Every fifteen minutes, starting at 5 minutes.
+		{"Mon Jul 9 15:05 2012", "5/15 * * * *", true},
+		{"Mon Jul 9 15:20 2012", "5/15 * * * *", true},
+		{"Mon Jul 9 15:50 2012", "5/15 * * * *", true},
+
+		// Named months
+		{"Sun Jul 15 15:00 2012", "0/15 * * Jul *", true},
+		{"Sun Jul 15 15:00 2012", "0/15 * * Jun *", false},
+
+		// Everything set.
+		{"Sun Jul 15 08:30 2012", "30 08 ? Jul Sun", true},
+		{"Sun Jul 15 08:30 2012", "30 08 15 Jul ?", true},
+		{"Mon Jul 16 08:30 2012", "30 08 ? Jul Sun", false},
+		{"Mon Jul 16 08:30 2012", "30 08 15 Jul ?", false},
+
+		// Predefined schedules
+		{"Mon Jul 9 15:00 2012", "@hourly", true},
+		{"Mon Jul 9 15:04 2012", "@hourly", false},
+		{"Mon Jul 9 15:00 2012", "@daily", false},
+		{"Mon Jul 9 00:00 2012", "@daily", true},
+		{"Mon Jul 9 00:00 2012", "@weekly", false},
+		{"Sun Jul 8 00:00 2012", "@weekly", true},
+		{"Sun Jul 8 01:00 2012", "@weekly", false},
+		{"Sun Jul 8 00:00 2012", "@monthly", false},
+		{"Sun Jul 1 00:00 2012", "@monthly", true},
+
+		// Test interaction of DOW and DOM.
+		// If both are restricted, then only one needs to match.
+		{"Sun Jul 15 00:00 2012", "* * 1,15 * Sun", true},
+		{"Fri Jun 15 00:00 2012", "* * 1,15 * Sun", true},
+		{"Wed Aug 1 00:00 2012", "* * 1,15 * Sun", true},
+		{"Sun Jul 15 00:00 2012", "* * */10 * Sun", true}, // verifies #70
+
+		// However, if one has a star, then both need to match.
+		{"Sun Jul 15 00:00 2012", "* * * * Mon", false},
+		{"Mon Jul 9 00:00 2012", "* * 1,15 * *", false},
+		{"Sun Jul 15 00:00 2012", "* * 1,15 * *", true},
+		{"Sun Jul 15 00:00 2012", "* * */2 * Sun", true},
+	}
+
+	for _, test := range tests {
+		sched, err := ParseStandard(test.spec)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		actual := sched.Next(getTime(test.time).Add(-1 * time.Second))
+		expected := getTime(test.time)
+		if test.expected && expected != actual || !test.expected && expected == actual {
+			t.Errorf("Fail evaluating %s on %s: (expected) %s != %s (actual)",
+				test.spec, test.time, expected, actual)
+		}
+	}
+}
+
+func TestNext(t *testing.T) {
+	runs := []struct {
+		time, spec string
+		expected   string
+	}{
+		// Simple cases
+		{"Mon Jul 9 14:45 2012", "0 0/15 * * * *", "Mon Jul 9 15:00 2012"},
+		{"Mon Jul 9 14:59 2012", "0 0/15 * * * *", "Mon Jul 9 15:00 2012"},
+		{"Mon Jul 9 14:59:59 2012", "0 0/15 * * * *", "Mon Jul 9 15:00 2012"},
+
+		// Wrap around hours
+		{"Mon Jul 9 15:45 2012", "0 20-35/15 * * * *", "Mon Jul 9 16:20 2012"},
+
+		// Wrap around days
+		{"Mon Jul 9 23:46 2012", "0 */15 * * * *", "Tue Jul 10 00:00 2012"},
+		{"Mon Jul 9 23:45 2012", "0 20-35/15 * * * *", "Tue Jul 10 00:20 2012"},
+		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 * * * *", "Tue Jul 10 00:20:15 2012"},
+		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 1/2 * * *", "Tue Jul 10 01:20:15 2012"},
+		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 10-12 * * *", "Tue Jul 10 10:20:15 2012"},
+
+		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 1/2 */2 * *", "Thu Jul 11 01:20:15 2012"},
+		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 * 9-20 * *", "Wed Jul 10 00:20:15 2012"},
+		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 * 9-20 Jul *", "Wed Jul 10 00:20:15 2012"},
+
+		// Wrap around months
+		{"Mon Jul 9 23:35 2012", "0 0 0 9 Apr-Oct ?", "Thu Aug 9 00:00 2012"},
+		{"Mon Jul 9 23:35 2012", "0 0 0 */5 Apr,Aug,Oct Mon", "Tue Aug 1 00:00 2012"},
+		{"Mon Jul 9 23:35 2012", "0 0 0 */5 Oct Mon", "Mon Oct 1 00:00 2012"},
+
+		// Wrap around years
+		{"Mon Jul 9 23:35 2012", "0 0 0 * Feb Mon", "Mon Feb 4 00:00 2013"},
+		{"Mon Jul 9 23:35 2012", "0 0 0 * Feb Mon/2", "Fri Feb 1 00:00 2013"},
+
+		// Wrap around minute, hour, day, month, and year
+		{"Mon Dec 31 23:59:45 2012", "0 * * * * *", "Tue Jan 1 00:00:00 2013"},
+
+		// Leap year
+		{"Mon Jul 9 23:35 2012", "0 0 0 29 Feb ?", "Mon Feb 29 00:00 2016"},
+
+		// Daylight savings time 2am EST (-5) -> 3am EDT (-4)
+		{"2012-03-11T00:00:00-0500", "TZ=America/New_York 0 30 2 11 Mar ?", "2013-03-11T02:30:00-0400"},
+
+		// hourly job
+		{"2012-03-11T00:00:00-0500", "TZ=America/New_York 0 0 * * * ?", "2012-03-11T01:00:00-0500"},
+		{"2012-03-11T01:00:00-0500", "TZ=America/New_York 0 0 * * * ?", "2012-03-11T03:00:00-0400"},
+		{"2012-03-11T03:00:00-0400", "TZ=America/New_York 0 0 * * * ?", "2012-03-11T04:00:00-0400"},
+		{"2012-03-11T04:00:00-0400", "TZ=America/New_York 0 0 * * * ?", "2012-03-11T05:00:00-0400"},
+
+		// hourly job using CRON_TZ
+		{"2012-03-11T00:00:00-0500", "CRON_TZ=America/New_York 0 0 * * * ?", "2012-03-11T01:00:00-0500"},
+		{"2012-03-11T01:00:00-0500", "CRON_TZ=America/New_York 0 0 * * * ?", "2012-03-11T03:00:00-0400"},
+		{"2012-03-11T03:00:00-0400", "CRON_TZ=America/New_York 0 0 * * * ?", "2012-03-11T04:00:00-0400"},
+		{"2012-03-11T04:00:00-0400", "CRON_TZ=America/New_York 0 0 * * * ?", "2012-03-11T05:00:00-0400"},
+
+		// 1am nightly job
+		{"2012-03-11T00:00:00-0500", "TZ=America/New_York 0 0 1 * * ?", "2012-03-11T01:00:00-0500"},
+		{"2012-03-11T01:00:00-0500", "TZ=America/New_York 0 0 1 * * ?", "2012-03-12T01:00:00-0400"},
+
+		// 2am nightly job (skipped)
+		{"2012-03-11T00:00:00-0500", "TZ=America/New_York 0 0 2 * * ?", "2012-03-12T02:00:00-0400"},
+
+		// Daylight savings time 2am EDT (-4) => 1am EST (-5)
+		{"2012-11-04T00:00:00-0400", "TZ=America/New_York 0 30 2 04 Nov ?", "2012-11-04T02:30:00-0500"},
+		{"2012-11-04T01:45:00-0400", "TZ=America/New_York 0 30 1 04 Nov ?", "2012-11-04T01:30:00-0500"},
+
+		// hourly job
+		{"2012-11-04T00:00:00-0400", "TZ=America/New_York 0 0 * * * ?", "2012-11-04T01:00:00-0400"},
+		{"2012-11-04T01:00:00-0400", "TZ=America/New_York 0 0 * * * ?", "2012-11-04T01:00:00-0500"},
+		{"2012-11-04T01:00:00-0500", "TZ=America/New_York 0 0 * * * ?", "2012-11-04T02:00:00-0500"},
+
+		// 1am nightly job (runs twice)
+		{"2012-11-04T00:00:00-0400", "TZ=America/New_York 0 0 1 * * ?", "2012-11-04T01:00:00-0400"},
+		{"2012-11-04T01:00:00-0400", "TZ=America/New_York 0 0 1 * * ?", "2012-11-04T01:00:00-0500"},
+		{"2012-11-04T01:00:00-0500", "TZ=America/New_York 0 0 1 * * ?", "2012-11-05T01:00:00-0500"},
+
+		// 2am nightly job
+		{"2012-11-04T00:00:00-0400", "TZ=America/New_York 0 0 2 * * ?", "2012-11-04T02:00:00-0500"},
+		{"2012-11-04T02:00:00-0500", "TZ=America/New_York 0 0 2 * * ?", "2012-11-05T02:00:00-0500"},
+
+		// 3am nightly job
+		{"2012-11-04T00:00:00-0400", "TZ=America/New_York 0 0 3 * * ?", "2012-11-04T03:00:00-0500"},
+		{"2012-11-04T03:00:00-0500", "TZ=America/New_York 0 0 3 * * ?", "2012-11-05T03:00:00-0500"},
+
+		// hourly job
+		{"TZ=America/New_York 2012-11-04T00:00:00-0400", "0 0 * * * ?", "2012-11-04T01:00:00-0400"},
+		{"TZ=America/New_York 2012-11-04T01:00:00-0400", "0 0 * * * ?", "2012-11-04T01:00:00-0500"},
+		{"TZ=America/New_York 2012-11-04T01:00:00-0500", "0 0 * * * ?", "2012-11-04T02:00:00-0500"},
+
+		// 1am nightly job (runs twice)
+		{"TZ=America/New_York 2012-11-04T00:00:00-0400", "0 0 1 * * ?", "2012-11-04T01:00:00-0400"},
+		{"TZ=America/New_York 2012-11-04T01:00:00-0400", "0 0 1 * * ?", "2012-11-04T01:00:00-0500"},
+		{"TZ=America/New_York 2012-11-04T01:00:00-0500", "0 0 1 * * ?", "2012-11-05T01:00:00-0500"},
+
+		// 2am nightly job
+		{"TZ=America/New_York 2012-11-04T00:00:00-0400", "0 0 2 * * ?", "2012-11-04T02:00:00-0500"},
+		{"TZ=America/New_York 2012-11-04T02:00:00-0500", "0 0 2 * * ?", "2012-11-05T02:00:00-0500"},
+
+		// 3am nightly job
+		{"TZ=America/New_York 2012-11-04T00:00:00-0400", "0 0 3 * * ?", "2012-11-04T03:00:00-0500"},
+		{"TZ=America/New_York 2012-11-04T03:00:00-0500", "0 0 3 * * ?", "2012-11-05T03:00:00-0500"},
+
+		// Unsatisfiable
+		{"Mon Jul 9 23:35 2012", "0 0 0 30 Feb ?", ""},
+		{"Mon Jul 9 23:35 2012", "0 0 0 31 Apr ?", ""},
+
+		// Monthly job
+		{"TZ=America/New_York 2012-11-04T00:00:00-0400", "0 0 3 3 * ?", "2012-12-03T03:00:00-0500"},
+
+		// Test the scenario of DST resulting in midnight not being a valid time.
+		// https://github.com/robfig/cron/issues/157
+		{"2018-10-17T05:00:00-0400", "TZ=America/Sao_Paulo 0 0 9 10 * ?", "2018-11-10T06:00:00-0500"},
+		{"2018-02-14T05:00:00-0500", "TZ=America/Sao_Paulo 0 0 9 22 * ?", "2018-02-22T07:00:00-0500"},
+	}
+
+	for _, c := range runs {
+		sched, err := secondParser.Parse(c.spec)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		actual := sched.Next(getTime(c.time))
+		expected := getTime(c.expected)
+		if !actual.Equal(expected) {
+			t.Errorf("%s, \"%s\": (expected) %v != %v (actual)", c.time, c.spec, expected, actual)
+		}
+	}
+}
+
+func TestErrors(t *testing.T) {
+	invalidSpecs := []string{
+		"xyz",
+		"60 0 * * *",
+		"0 60 * * *",
+		"0 0 * * XYZ",
+	}
+	for _, spec := range invalidSpecs {
+		_, err := ParseStandard(spec)
+		if err == nil {
+			t.Error("expected an error parsing: ", spec)
+		}
+	}
+}
+
+func getTime(value string) time.Time {
+	if value == "" {
+		return time.Time{}
+	}
+
+	var location = time.Local
+	if strings.HasPrefix(value, "TZ=") {
+		parts := strings.Fields(value)
+		loc, err := time.LoadLocation(parts[0][len("TZ="):])
+		if err != nil {
+			panic("could not parse location:" + err.Error())
+		}
+		location = loc
+		value = parts[1]
+	}
+
+	var layouts = []string{
+		"Mon Jan 2 15:04 2006",
+		"Mon Jan 2 15:04:05 2006",
+	}
+	for _, layout := range layouts {
+		if t, err := time.ParseInLocation(layout, value, location); err == nil {
+			return t
+		}
+	}
+	if t, err := time.ParseInLocation("2006-01-02T15:04:05-0700", value, location); err == nil {
+		return t
+	}
+	panic("could not parse time value " + value)
+}
+
+func TestNextWithTz(t *testing.T) {
+	runs := []struct {
+		time, spec string
+		expected   string
+	}{
+		// Failing tests
+		{"2016-01-03T13:09:03+0530", "14 14 * * *", "2016-01-03T14:14:00+0530"},
+		{"2016-01-03T04:09:03+0530", "14 14 * * ?", "2016-01-03T14:14:00+0530"},
+
+		// Passing tests
+		{"2016-01-03T14:09:03+0530", "14 14 * * *", "2016-01-03T14:14:00+0530"},
+		{"2016-01-03T14:00:00+0530", "14 14 * * ?", "2016-01-03T14:14:00+0530"},
+	}
+	for _, c := range runs {
+		sched, err := ParseStandard(c.spec)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		actual := sched.Next(getTimeTZ(c.time))
+		expected := getTimeTZ(c.expected)
+		if !actual.Equal(expected) {
+			t.Errorf("%s, \"%s\": (expected) %v != %v (actual)", c.time, c.spec, expected, actual)
+		}
+	}
+}
+
+func getTimeTZ(value string) time.Time {
+	if value == "" {
+		return time.Time{}
+	}
+	t, err := time.Parse("Mon Jan 2 15:04 2006", value)
+	if err != nil {
+		t, err = time.Parse("Mon Jan 2 15:04:05 2006", value)
+		if err != nil {
+			t, err = time.Parse("2006-01-02T15:04:05-0700", value)
+			if err != nil {
+				panic(err)
+			}
+		}
+	}
+
+	return t
+}
+
+// https://github.com/robfig/cron/issues/144
+func TestSlash0NoHang(t *testing.T) {
+	schedule := "TZ=America/New_York 15/0 * * * *"
+	_, err := ParseStandard(schedule)
+	if err == nil {
+		t.Error("expected an error on 0 increment")
+	}
+}

plugin/email/README.md

@@ -0,0 +1,507 @@
+# Email Plugin
+
+SMTP email sending functionality for self-hosted Memos instances.
+
+## Overview
+
+This plugin provides a simple, reliable email sending interface following industry-standard SMTP protocols. It's designed for self-hosted environments where instance administrators configure their own email service, similar to platforms like GitHub, GitLab, and Discourse.
+
+## Features
+
+- Standard SMTP protocol support
+- TLS/STARTTLS and SSL/TLS encryption
+- HTML and plain text emails
+- Multiple recipients (To, Cc, Bcc)
+- Synchronous and asynchronous sending
+- Detailed error reporting with context
+- Works with all major email providers
+- Reply-To header support
+- RFC 5322 compliant message formatting
+
+## Quick Start
+
+### 1. Configure SMTP Settings
+
+```go
+import "github.com/usememos/memos/plugin/email"
+
+config := &email.Config{
+    SMTPHost:     "smtp.gmail.com",
+    SMTPPort:     587,
+    SMTPUsername: "your-email@gmail.com",
+    SMTPPassword: "your-app-password",
+    FromEmail:    "noreply@yourdomain.com",
+    FromName:     "Memos",
+    UseTLS:       true,
+}
+```
+
+### 2. Create and Send Email
+
+```go
+message := &email.Message{
+    To:      []string{"user@example.com"},
+    Subject: "Welcome to Memos!",
+    Body:    "Thanks for signing up.",
+    IsHTML:  false,
+}
+
+// Synchronous send (waits for result)
+err := email.Send(config, message)
+if err != nil {
+    log.Printf("Failed to send email: %v", err)
+}
+
+// Asynchronous send (returns immediately)
+email.SendAsync(config, message)
+```
+
+## Provider Configuration
+
+### Gmail
+
+Requires an [App Password](https://support.google.com/accounts/answer/185833) (2FA must be enabled):
+
+```go
+config := &email.Config{
+    SMTPHost:     "smtp.gmail.com",
+    SMTPPort:     587,
+    SMTPUsername: "your-email@gmail.com",
+    SMTPPassword: "your-16-char-app-password",
+    FromEmail:    "your-email@gmail.com",
+    FromName:     "Memos",
+    UseTLS:       true,
+}
+```
+
+**Alternative (SSL):**
+```go
+config := &email.Config{
+    SMTPHost:     "smtp.gmail.com",
+    SMTPPort:     465,
+    SMTPUsername: "your-email@gmail.com",
+    SMTPPassword: "your-16-char-app-password",
+    FromEmail:    "your-email@gmail.com",
+    FromName:     "Memos",
+    UseSSL:       true,
+}
+```
+
+### SendGrid
+
+```go
+config := &email.Config{
+    SMTPHost:     "smtp.sendgrid.net",
+    SMTPPort:     587,
+    SMTPUsername: "apikey",
+    SMTPPassword: "your-sendgrid-api-key",
+    FromEmail:    "noreply@yourdomain.com",
+    FromName:     "Memos",
+    UseTLS:       true,
+}
+```
+
+### AWS SES
+
+```go
+config := &email.Config{
+    SMTPHost:     "email-smtp.us-east-1.amazonaws.com",
+    SMTPPort:     587,
+    SMTPUsername: "your-smtp-username",
+    SMTPPassword: "your-smtp-password",
+    FromEmail:    "verified@yourdomain.com",
+    FromName:     "Memos",
+    UseTLS:       true,
+}
+```
+
+**Note:** Replace `us-east-1` with your AWS region. Email must be verified in SES.
+
+### Mailgun
+
+```go
+config := &email.Config{
+    SMTPHost:     "smtp.mailgun.org",
+    SMTPPort:     587,
+    SMTPUsername: "postmaster@yourdomain.com",
+    SMTPPassword: "your-mailgun-smtp-password",
+    FromEmail:    "noreply@yourdomain.com",
+    FromName:     "Memos",
+    UseTLS:       true,
+}
+```
+
+### Self-Hosted SMTP (Postfix, Exim, etc.)
+
+```go
+config := &email.Config{
+    SMTPHost:     "mail.yourdomain.com",
+    SMTPPort:     587,
+    SMTPUsername: "username",
+    SMTPPassword: "password",
+    FromEmail:    "noreply@yourdomain.com",
+    FromName:     "Memos",
+    UseTLS:       true,
+}
+```
+
+## HTML Emails
+
+```go
+message := &email.Message{
+    To:      []string{"user@example.com"},
+    Subject: "Welcome to Memos!",
+    Body: `
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="UTF-8">
+</head>
+<body style="font-family: Arial, sans-serif;">
+    <h1 style="color: #333;">Welcome to Memos!</h1>
+    <p>We're excited to have you on board.</p>
+    <a href="https://yourdomain.com" style="background-color: #4CAF50; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px;">Get Started</a>
+</body>
+</html>
+    `,
+    IsHTML: true,
+}
+
+email.Send(config, message)
+```
+
+## Multiple Recipients
+
+```go
+message := &email.Message{
+    To:      []string{"user1@example.com", "user2@example.com"},
+    Cc:      []string{"manager@example.com"},
+    Bcc:     []string{"admin@example.com"},
+    Subject: "Team Update",
+    Body:    "Important team announcement...",
+    ReplyTo: "support@yourdomain.com",
+}
+
+email.Send(config, message)
+```
+
+## Testing
+
+### Run Tests
+
+```bash
+# All tests
+go test ./plugin/email/... -v
+
+# With coverage
+go test ./plugin/email/... -v -cover
+
+# With race detector
+go test ./plugin/email/... -race
+```
+
+### Manual Testing
+
+Create a simple test program:
+
+```go
+package main
+
+import (
+    "log"
+    "github.com/usememos/memos/plugin/email"
+)
+
+func main() {
+    config := &email.Config{
+        SMTPHost:     "smtp.gmail.com",
+        SMTPPort:     587,
+        SMTPUsername: "your-email@gmail.com",
+        SMTPPassword: "your-app-password",
+        FromEmail:    "your-email@gmail.com",
+        FromName:     "Test",
+        UseTLS:       true,
+    }
+
+    message := &email.Message{
+        To:      []string{"recipient@example.com"},
+        Subject: "Test Email",
+        Body:    "This is a test email from Memos email plugin.",
+    }
+
+    if err := email.Send(config, message); err != nil {
+        log.Fatalf("Failed to send email: %v", err)
+    }
+
+    log.Println("Email sent successfully!")
+}
+```
+
+## Security Best Practices
+
+### 1. Use TLS/SSL Encryption
+
+Always enable encryption in production:
+
+```go
+// STARTTLS (port 587) - Recommended
+config.UseTLS = true
+
+// SSL/TLS (port 465)
+config.UseSSL = true
+```
+
+### 2. Secure Credential Storage
+
+Never hardcode credentials. Use environment variables:
+
+```go
+import "os"
+
+config := &email.Config{
+    SMTPHost:     os.Getenv("SMTP_HOST"),
+    SMTPPort:     587,
+    SMTPUsername: os.Getenv("SMTP_USERNAME"),
+    SMTPPassword: os.Getenv("SMTP_PASSWORD"),
+    FromEmail:    os.Getenv("SMTP_FROM_EMAIL"),
+    UseTLS:       true,
+}
+```
+
+### 3. Use App-Specific Passwords
+
+For Gmail and similar services, use app passwords instead of your main account password.
+
+### 4. Validate and Sanitize Input
+
+Always validate email addresses and sanitize content:
+
+```go
+// Validate before sending
+if err := message.Validate(); err != nil {
+    return err
+}
+```
+
+### 5. Implement Rate Limiting
+
+Prevent abuse by limiting email sending:
+
+```go
+// Example using golang.org/x/time/rate
+limiter := rate.NewLimiter(rate.Every(time.Second), 10) // 10 emails per second
+
+if !limiter.Allow() {
+    return errors.New("rate limit exceeded")
+}
+```
+
+### 6. Monitor and Log
+
+Log email sending activity for security monitoring:
+
+```go
+if err := email.Send(config, message); err != nil {
+    slog.Error("Email send failed",
+        slog.String("recipient", message.To[0]),
+        slog.Any("error", err))
+}
+```
+
+## Common Ports
+
+| Port | Protocol | Security | Use Case |
+|------|----------|----------|----------|
+| **587** | SMTP + STARTTLS | Encrypted | **Recommended** for most providers |
+| **465** | SMTP over SSL/TLS | Encrypted | Alternative secure option |
+| **25** | SMTP | Unencrypted | Legacy, often blocked by ISPs |
+| **2525** | SMTP + STARTTLS | Encrypted | Alternative when 587 is blocked |
+
+**Port 587 (STARTTLS)** is the recommended standard for modern SMTP:
+```go
+config := &email.Config{
+    SMTPPort: 587,
+    UseTLS:   true,
+}
+```
+
+**Port 465 (SSL/TLS)** is the alternative:
+```go
+config := &email.Config{
+    SMTPPort: 465,
+    UseSSL:   true,
+}
+```
+
+## Error Handling
+
+The package provides detailed, contextual errors:
+
+```go
+err := email.Send(config, message)
+if err != nil {
+    // Error messages include context:
+    switch {
+    case strings.Contains(err.Error(), "invalid email configuration"):
+        // Configuration error (missing host, invalid port, etc.)
+        log.Printf("Configuration error: %v", err)
+
+    case strings.Contains(err.Error(), "invalid email message"):
+        // Message validation error (missing recipients, subject, body)
+        log.Printf("Message error: %v", err)
+
+    case strings.Contains(err.Error(), "authentication failed"):
+        // SMTP authentication failed (wrong credentials)
+        log.Printf("Auth error: %v", err)
+
+    case strings.Contains(err.Error(), "failed to connect"):
+        // Network/connection error
+        log.Printf("Connection error: %v", err)
+
+    case strings.Contains(err.Error(), "recipient rejected"):
+        // SMTP server rejected recipient
+        log.Printf("Recipient error: %v", err)
+
+    default:
+        log.Printf("Unknown error: %v", err)
+    }
+}
+```
+
+### Common Error Messages
+
+```
+❌ "invalid email configuration: SMTP host is required"
+   → Fix: Set config.SMTPHost
+
+❌ "invalid email configuration: SMTP port must be between 1 and 65535"
+   → Fix: Set valid config.SMTPPort (usually 587 or 465)
+
+❌ "invalid email configuration: from email is required"
+   → Fix: Set config.FromEmail
+
+❌ "invalid email message: at least one recipient is required"
+   → Fix: Set message.To with at least one email address
+
+❌ "invalid email message: subject is required"
+   → Fix: Set message.Subject
+
+❌ "invalid email message: body is required"
+   → Fix: Set message.Body
+
+❌ "SMTP authentication failed"
+   → Fix: Check credentials (username/password)
+
+❌ "failed to connect to SMTP server"
+   → Fix: Verify host/port, check firewall, ensure TLS/SSL settings match server
+```
+
+### Async Error Handling
+
+For async sending, errors are logged automatically:
+
+```go
+email.SendAsync(config, message)
+// Errors logged as:
+// [WARN] Failed to send email asynchronously recipients=user@example.com error=...
+```
+
+## Dependencies
+
+### Required
+
+- **Go 1.25+**
+- Standard library: `net/smtp`, `crypto/tls`
+- `github.com/pkg/errors` - Error wrapping with context
+
+### No External SMTP Libraries
+
+This plugin uses Go's standard `net/smtp` library for maximum compatibility and minimal dependencies.
+
+## API Reference
+
+### Types
+
+#### `Config`
+```go
+type Config struct {
+    SMTPHost     string // SMTP server hostname
+    SMTPPort     int    // SMTP server port
+    SMTPUsername string // SMTP auth username
+    SMTPPassword string // SMTP auth password
+    FromEmail    string // From email address
+    FromName     string // From display name (optional)
+    UseTLS       bool   // Enable STARTTLS (port 587)
+    UseSSL       bool   // Enable SSL/TLS (port 465)
+}
+```
+
+#### `Message`
+```go
+type Message struct {
+    To      []string // Recipients
+    Cc      []string // CC recipients (optional)
+    Bcc     []string // BCC recipients (optional)
+    Subject string   // Email subject
+    Body    string   // Email body (plain text or HTML)
+    IsHTML  bool     // true for HTML, false for plain text
+    ReplyTo string   // Reply-To address (optional)
+}
+```
+
+### Functions
+
+#### `Send(config *Config, message *Message) error`
+Sends an email synchronously. Blocks until email is sent or error occurs.
+
+#### `SendAsync(config *Config, message *Message)`
+Sends an email asynchronously in a goroutine. Returns immediately. Errors are logged.
+
+#### `NewClient(config *Config) *Client`
+Creates a new SMTP client for advanced usage.
+
+#### `Client.Send(message *Message) error`
+Sends email using the client's configuration.
+
+## Architecture
+
+```
+plugin/email/
+├── config.go       # SMTP configuration types
+├── message.go      # Email message types and formatting
+├── client.go       # SMTP client implementation
+├── email.go        # High-level Send/SendAsync API
+├── doc.go          # Package documentation
+└── *_test.go       # Unit tests
+```
+
+## License
+
+Part of the Memos project. See main repository for license details.
+
+## Contributing
+
+This plugin follows the Memos contribution guidelines. Please ensure:
+
+1. All code is tested (TDD approach)
+2. Tests pass: `go test ./plugin/email/... -v`
+3. Code is formatted: `go fmt ./plugin/email/...`
+4. No linting errors: `golangci-lint run ./plugin/email/...`
+
+## Support
+
+For issues and questions:
+
+- Memos GitHub Issues: https://github.com/usememos/memos/issues
+- Memos Documentation: https://usememos.com/docs
+
+## Roadmap
+
+Future enhancements may include:
+
+- Email template system
+- Attachment support
+- Inline image embedding
+- Email queuing system
+- Delivery status tracking
+- Bounce handling

plugin/email/client.go

@@ -0,0 +1,143 @@
+package email
+
+import (
+	"crypto/tls"
+	"net/smtp"
+
+	"github.com/pkg/errors"
+)
+
+// Client represents an SMTP email client.
+type Client struct {
+	config *Config
+}
+
+// NewClient creates a new email client with the given configuration.
+func NewClient(config *Config) *Client {
+	return &Client{
+		config: config,
+	}
+}
+
+// validateConfig validates the client configuration.
+func (c *Client) validateConfig() error {
+	if c.config == nil {
+		return errors.New("email configuration is required")
+	}
+	return c.config.Validate()
+}
+
+// createAuth creates an SMTP auth mechanism if credentials are provided.
+func (c *Client) createAuth() smtp.Auth {
+	if c.config.SMTPUsername == "" && c.config.SMTPPassword == "" {
+		return nil
+	}
+	return smtp.PlainAuth("", c.config.SMTPUsername, c.config.SMTPPassword, c.config.SMTPHost)
+}
+
+// createTLSConfig creates a TLS configuration for secure connections.
+func (c *Client) createTLSConfig() *tls.Config {
+	return &tls.Config{
+		ServerName: c.config.SMTPHost,
+		MinVersion: tls.VersionTLS12,
+	}
+}
+
+// Send sends an email message via SMTP.
+func (c *Client) Send(message *Message) error {
+	// Validate configuration
+	if err := c.validateConfig(); err != nil {
+		return errors.Wrap(err, "invalid email configuration")
+	}
+
+	// Validate message
+	if message == nil {
+		return errors.New("message is required")
+	}
+	if err := message.Validate(); err != nil {
+		return errors.Wrap(err, "invalid email message")
+	}
+
+	// Format the message
+	body := message.Format(c.config.FromEmail, c.config.FromName)
+
+	// Get all recipients
+	recipients := message.GetAllRecipients()
+
+	// Create auth
+	auth := c.createAuth()
+
+	// Send based on encryption type
+	if c.config.UseSSL {
+		return c.sendWithSSL(auth, recipients, body)
+	}
+	return c.sendWithTLS(auth, recipients, body)
+}
+
+// sendWithTLS sends email using STARTTLS (port 587).
+func (c *Client) sendWithTLS(auth smtp.Auth, recipients []string, body string) error {
+	serverAddr := c.config.GetServerAddress()
+
+	if c.config.UseTLS {
+		// Use STARTTLS
+		return smtp.SendMail(serverAddr, auth, c.config.FromEmail, recipients, []byte(body))
+	}
+
+	// Send without encryption (not recommended)
+	return smtp.SendMail(serverAddr, auth, c.config.FromEmail, recipients, []byte(body))
+}
+
+// sendWithSSL sends email using SSL/TLS (port 465).
+func (c *Client) sendWithSSL(auth smtp.Auth, recipients []string, body string) error {
+	serverAddr := c.config.GetServerAddress()
+
+	// Create TLS connection
+	tlsConfig := c.createTLSConfig()
+	conn, err := tls.Dial("tcp", serverAddr, tlsConfig)
+	if err != nil {
+		return errors.Wrapf(err, "failed to connect to SMTP server with SSL: %s", serverAddr)
+	}
+	defer conn.Close()
+
+	// Create SMTP client
+	client, err := smtp.NewClient(conn, c.config.SMTPHost)
+	if err != nil {
+		return errors.Wrap(err, "failed to create SMTP client")
+	}
+	defer client.Quit()
+
+	// Authenticate
+	if auth != nil {
+		if err := client.Auth(auth); err != nil {
+			return errors.Wrap(err, "SMTP authentication failed")
+		}
+	}
+
+	// Set sender
+	if err := client.Mail(c.config.FromEmail); err != nil {
+		return errors.Wrap(err, "failed to set sender")
+	}
+
+	// Set recipients
+	for _, recipient := range recipients {
+		if err := client.Rcpt(recipient); err != nil {
+			return errors.Wrapf(err, "failed to set recipient: %s", recipient)
+		}
+	}
+
+	// Send message body
+	writer, err := client.Data()
+	if err != nil {
+		return errors.Wrap(err, "failed to send DATA command")
+	}
+
+	if _, err := writer.Write([]byte(body)); err != nil {
+		return errors.Wrap(err, "failed to write message body")
+	}
+
+	if err := writer.Close(); err != nil {
+		return errors.Wrap(err, "failed to close message writer")
+	}
+
+	return nil
+}

plugin/email/client_test.go

@@ -0,0 +1,121 @@
+package email
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewClient(t *testing.T) {
+	config := &Config{
+		SMTPHost:     "smtp.example.com",
+		SMTPPort:     587,
+		SMTPUsername: "user@example.com",
+		SMTPPassword: "password",
+		FromEmail:    "noreply@example.com",
+		FromName:     "Test App",
+		UseTLS:       true,
+	}
+
+	client := NewClient(config)
+
+	assert.NotNil(t, client)
+	assert.Equal(t, config, client.config)
+}
+
+func TestClientValidateConfig(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		wantErr bool
+	}{
+		{
+			name: "valid config",
+			config: &Config{
+				SMTPHost:  "smtp.example.com",
+				SMTPPort:  587,
+				FromEmail: "test@example.com",
+			},
+			wantErr: false,
+		},
+		{
+			name:    "nil config",
+			config:  nil,
+			wantErr: true,
+		},
+		{
+			name: "invalid config",
+			config: &Config{
+				SMTPHost: "",
+				SMTPPort: 587,
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			client := NewClient(tt.config)
+			err := client.validateConfig()
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestClientSendValidation(t *testing.T) {
+	config := &Config{
+		SMTPHost:  "smtp.example.com",
+		SMTPPort:  587,
+		FromEmail: "test@example.com",
+	}
+	client := NewClient(config)
+
+	tests := []struct {
+		name    string
+		message *Message
+		wantErr bool
+	}{
+		{
+			name: "valid message",
+			message: &Message{
+				To:      []string{"recipient@example.com"},
+				Subject: "Test",
+				Body:    "Test body",
+			},
+			wantErr: false, // Will fail on actual send, but passes validation
+		},
+		{
+			name:    "nil message",
+			message: nil,
+			wantErr: true,
+		},
+		{
+			name: "invalid message",
+			message: &Message{
+				To:      []string{},
+				Subject: "Test",
+				Body:    "Test",
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := client.Send(tt.message)
+			// We expect validation errors for invalid messages
+			// For valid messages, we'll get connection errors (which is expected in tests)
+			if tt.wantErr {
+				assert.Error(t, err)
+				// Should fail validation before attempting connection
+				assert.NotContains(t, err.Error(), "dial")
+			}
+			// Note: We don't assert NoError for valid messages because
+			// we don't have a real SMTP server in tests
+		})
+	}
+}

plugin/email/config.go

@@ -0,0 +1,47 @@
+package email
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+)
+
+// Config represents the SMTP configuration for email sending.
+// These settings should be provided by the self-hosted instance administrator.
+type Config struct {
+	// SMTPHost is the SMTP server hostname (e.g., "smtp.gmail.com")
+	SMTPHost string
+	// SMTPPort is the SMTP server port (common: 587 for TLS, 465 for SSL, 25 for unencrypted)
+	SMTPPort int
+	// SMTPUsername is the SMTP authentication username (usually the email address)
+	SMTPUsername string
+	// SMTPPassword is the SMTP authentication password or app-specific password
+	SMTPPassword string
+	// FromEmail is the email address that will appear in the "From" field
+	FromEmail string
+	// FromName is the display name that will appear in the "From" field
+	FromName string
+	// UseTLS enables STARTTLS encryption (recommended for port 587)
+	UseTLS bool
+	// UseSSL enables SSL/TLS encryption (for port 465)
+	UseSSL bool
+}
+
+// Validate checks if the configuration is valid.
+func (c *Config) Validate() error {
+	if c.SMTPHost == "" {
+		return errors.New("SMTP host is required")
+	}
+	if c.SMTPPort <= 0 || c.SMTPPort > 65535 {
+		return errors.New("SMTP port must be between 1 and 65535")
+	}
+	if c.FromEmail == "" {
+		return errors.New("from email is required")
+	}
+	return nil
+}
+
+// GetServerAddress returns the SMTP server address in the format "host:port".
+func (c *Config) GetServerAddress() string {
+	return fmt.Sprintf("%s:%d", c.SMTPHost, c.SMTPPort)
+}

plugin/email/config_test.go

@@ -0,0 +1,80 @@
+package email
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfigValidation(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		wantErr bool
+	}{
+		{
+			name: "valid config",
+			config: &Config{
+				SMTPHost:     "smtp.gmail.com",
+				SMTPPort:     587,
+				SMTPUsername: "user@example.com",
+				SMTPPassword: "password",
+				FromEmail:    "noreply@example.com",
+				FromName:     "Memos",
+			},
+			wantErr: false,
+		},
+		{
+			name: "missing host",
+			config: &Config{
+				SMTPPort:     587,
+				SMTPUsername: "user@example.com",
+				SMTPPassword: "password",
+				FromEmail:    "noreply@example.com",
+			},
+			wantErr: true,
+		},
+		{
+			name: "invalid port",
+			config: &Config{
+				SMTPHost:     "smtp.gmail.com",
+				SMTPPort:     0,
+				SMTPUsername: "user@example.com",
+				SMTPPassword: "password",
+				FromEmail:    "noreply@example.com",
+			},
+			wantErr: true,
+		},
+		{
+			name: "missing from email",
+			config: &Config{
+				SMTPHost:     "smtp.gmail.com",
+				SMTPPort:     587,
+				SMTPUsername: "user@example.com",
+				SMTPPassword: "password",
+			},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.config.Validate()
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestConfigGetServerAddress(t *testing.T) {
+	config := &Config{
+		SMTPHost: "smtp.gmail.com",
+		SMTPPort: 587,
+	}
+
+	expected := "smtp.gmail.com:587"
+	assert.Equal(t, expected, config.GetServerAddress())
+}

plugin/email/doc.go

@@ -0,0 +1,98 @@
+// Package email provides SMTP email sending functionality for self-hosted Memos instances.
+//
+// This package is designed for self-hosted environments where instance administrators
+// configure their own SMTP servers. It follows industry-standard patterns used by
+// platforms like GitHub, GitLab, and Discourse.
+//
+// # Configuration
+//
+// The package requires SMTP server configuration provided by the instance administrator:
+//
+//	config := &email.Config{
+//	    SMTPHost:     "smtp.gmail.com",
+//	    SMTPPort:     587,
+//	    SMTPUsername: "your-email@gmail.com",
+//	    SMTPPassword: "your-app-password",
+//	    FromEmail:    "noreply@yourdomain.com",
+//	    FromName:     "Memos Notifications",
+//	    UseTLS:       true,
+//	}
+//
+// # Common SMTP Settings
+//
+// Gmail (requires App Password):
+//   - Host: smtp.gmail.com
+//   - Port: 587 (TLS) or 465 (SSL)
+//   - Username: your-email@gmail.com
+//   - UseTLS: true (for port 587) or UseSSL: true (for port 465)
+//
+// SendGrid:
+//   - Host: smtp.sendgrid.net
+//   - Port: 587
+//   - Username: apikey
+//   - Password: your-sendgrid-api-key
+//   - UseTLS: true
+//
+// AWS SES:
+//   - Host: email-smtp.[region].amazonaws.com
+//   - Port: 587
+//   - Username: your-smtp-username
+//   - Password: your-smtp-password
+//   - UseTLS: true
+//
+// Mailgun:
+//   - Host: smtp.mailgun.org
+//   - Port: 587
+//   - Username: your-mailgun-smtp-username
+//   - Password: your-mailgun-smtp-password
+//   - UseTLS: true
+//
+// # Sending Email
+//
+// Synchronous (waits for completion):
+//
+//	message := &email.Message{
+//	    To:      []string{"user@example.com"},
+//	    Subject: "Welcome to Memos",
+//	    Body:    "Thank you for joining!",
+//	    IsHTML:  false,
+//	}
+//
+//	err := email.Send(config, message)
+//	if err != nil {
+//	    // Handle error
+//	}
+//
+// Asynchronous (returns immediately):
+//
+//	email.SendAsync(config, message)
+//	// Errors are logged but not returned
+//
+// # HTML Email
+//
+//	message := &email.Message{
+//	    To:      []string{"user@example.com"},
+//	    Subject: "Welcome!",
+//	    Body:    "<html><body><h1>Welcome to Memos!</h1></body></html>",
+//	    IsHTML:  true,
+//	}
+//
+// # Security Considerations
+//
+//   - Always use TLS (port 587) or SSL (port 465) for production
+//   - Store SMTP credentials securely (environment variables or secrets management)
+//   - Use app-specific passwords for services like Gmail
+//   - Validate and sanitize email content to prevent injection attacks
+//   - Rate limit email sending to prevent abuse
+//
+// # Error Handling
+//
+// The package returns descriptive errors for common issues:
+//   - Configuration validation errors (missing host, invalid port, etc.)
+//   - Message validation errors (missing recipients, subject, or body)
+//   - Connection errors (cannot reach SMTP server)
+//   - Authentication errors (invalid credentials)
+//   - SMTP protocol errors (recipient rejected, etc.)
+//
+// All errors are wrapped with context using github.com/pkg/errors for better debugging.
+package email

plugin/email/email.go

@@ -0,0 +1,43 @@
+package email
+
+import (
+	"log/slog"
+
+	"github.com/pkg/errors"
+)
+
+// Send sends an email synchronously.
+// Returns an error if the email fails to send.
+func Send(config *Config, message *Message) error {
+	if config == nil {
+		return errors.New("email configuration is required")
+	}
+	if message == nil {
+		return errors.New("email message is required")
+	}
+
+	client := NewClient(config)
+	return client.Send(message)
+}
+
+// SendAsync sends an email asynchronously.
+// It spawns a new goroutine to handle the sending and does not wait for the response.
+// Any errors are logged but not returned.
+func SendAsync(config *Config, message *Message) {
+	go func() {
+		if err := Send(config, message); err != nil {
+			// Since we're in a goroutine, we can only log the error
+			recipients := ""
+			if message != nil && len(message.To) > 0 {
+				recipients = message.To[0]
+				if len(message.To) > 1 {
+					recipients += " and others"
+				}
+			}
+
+			slog.Warn("Failed to send email asynchronously",
+				slog.String("recipients", recipients),
+				slog.Any("error", err))
+		}
+	}()
+}

plugin/email/email_test.go

@@ -0,0 +1,127 @@
+package email
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/sync/errgroup"
+)
+
+func TestSend(t *testing.T) {
+	config := &Config{
+		SMTPHost:  "smtp.example.com",
+		SMTPPort:  587,
+		FromEmail: "test@example.com",
+	}
+
+	message := &Message{
+		To:      []string{"recipient@example.com"},
+		Subject: "Test",
+		Body:    "Test body",
+	}
+
+	// This will fail to connect (no real server), but should validate inputs
+	err := Send(config, message)
+	// We expect an error because there's no real SMTP server
+	// But it should be a connection error, not a validation error
+	assert.Error(t, err)
+	assert.Contains(t, err.Error(), "dial")
+}
+
+func TestSendValidation(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		message *Message
+		wantErr bool
+		errMsg  string
+	}{
+		{
+			name:    "nil config",
+			config:  nil,
+			message: &Message{To: []string{"test@example.com"}, Subject: "Test", Body: "Test"},
+			wantErr: true,
+			errMsg:  "configuration is required",
+		},
+		{
+			name:    "nil message",
+			config:  &Config{SMTPHost: "smtp.example.com", SMTPPort: 587, FromEmail: "from@example.com"},
+			message: nil,
+			wantErr: true,
+			errMsg:  "message is required",
+		},
+		{
+			name: "invalid config",
+			config: &Config{
+				SMTPHost: "",
+				SMTPPort: 587,
+			},
+			message: &Message{To: []string{"test@example.com"}, Subject: "Test", Body: "Test"},
+			wantErr: true,
+			errMsg:  "invalid email configuration",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := Send(tt.config, tt.message)
+			if tt.wantErr {
+				assert.Error(t, err)
+				assert.Contains(t, err.Error(), tt.errMsg)
+			}
+		})
+	}
+}
+
+func TestSendAsync(t *testing.T) {
+	config := &Config{
+		SMTPHost:  "smtp.example.com",
+		SMTPPort:  587,
+		FromEmail: "test@example.com",
+	}
+
+	message := &Message{
+		To:      []string{"recipient@example.com"},
+		Subject: "Test Async",
+		Body:    "Test async body",
+	}
+
+	// SendAsync should not block
+	start := time.Now()
+	SendAsync(config, message)
+	duration := time.Since(start)
+
+	// Should return almost immediately (< 100ms)
+	assert.Less(t, duration, 100*time.Millisecond)
+
+	// Give goroutine time to start
+	time.Sleep(50 * time.Millisecond)
+}
+
+func TestSendAsyncConcurrent(t *testing.T) {
+	config := &Config{
+		SMTPHost:  "smtp.example.com",
+		SMTPPort:  587,
+		FromEmail: "test@example.com",
+	}
+
+	g := errgroup.Group{}
+	count := 5
+
+	for i := 0; i < count; i++ {
+		g.Go(func() error {
+			message := &Message{
+				To:      []string{"recipient@example.com"},
+				Subject: "Concurrent Test",
+				Body:    "Test body",
+			}
+			SendAsync(config, message)
+			return nil
+		})
+	}
+
+	if err := g.Wait(); err != nil {
+		t.Fatalf("SendAsync calls failed: %v", err)
+	}
+}

plugin/email/message.go

@@ -0,0 +1,91 @@
+package email
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+)
+
+// Message represents an email message to be sent.
+type Message struct {
+	To      []string // Required: recipient email addresses
+	Cc      []string // Optional: carbon copy recipients
+	Bcc     []string // Optional: blind carbon copy recipients
+	Subject string   // Required: email subject
+	Body    string   // Required: email body content
+	IsHTML  bool     // Whether the body is HTML (default: false for plain text)
+	ReplyTo string   // Optional: reply-to address
+}
+
+// Validate checks that the message has all required fields.
+func (m *Message) Validate() error {
+	if len(m.To) == 0 {
+		return errors.New("at least one recipient is required")
+	}
+	if m.Subject == "" {
+		return errors.New("subject is required")
+	}
+	if m.Body == "" {
+		return errors.New("body is required")
+	}
+	return nil
+}
+
+// Format creates an RFC 5322 formatted email message.
+func (m *Message) Format(fromEmail, fromName string) string {
+	var sb strings.Builder
+
+	// From header
+	if fromName != "" {
+		sb.WriteString(fmt.Sprintf("From: %s <%s>\r\n", fromName, fromEmail))
+	} else {
+		sb.WriteString(fmt.Sprintf("From: %s\r\n", fromEmail))
+	}
+
+	// To header
+	sb.WriteString(fmt.Sprintf("To: %s\r\n", strings.Join(m.To, ", ")))
+
+	// Cc header (optional)
+	if len(m.Cc) > 0 {
+		sb.WriteString(fmt.Sprintf("Cc: %s\r\n", strings.Join(m.Cc, ", ")))
+	}
+
+	// Reply-To header (optional)
+	if m.ReplyTo != "" {
+		sb.WriteString(fmt.Sprintf("Reply-To: %s\r\n", m.ReplyTo))
+	}
+
+	// Subject header
+	sb.WriteString(fmt.Sprintf("Subject: %s\r\n", m.Subject))
+
+	// Date header (RFC 5322 format)
+	sb.WriteString(fmt.Sprintf("Date: %s\r\n", time.Now().Format(time.RFC1123Z)))
+
+	// MIME headers
+	sb.WriteString("MIME-Version: 1.0\r\n")
+
+	// Content-Type header
+	if m.IsHTML {
+		sb.WriteString("Content-Type: text/html; charset=utf-8\r\n")
+	} else {
+		sb.WriteString("Content-Type: text/plain; charset=utf-8\r\n")
+	}
+
+	// Empty line separating headers from body
+	sb.WriteString("\r\n")
+
+	// Body
+	sb.WriteString(m.Body)
+
+	return sb.String()
+}
+
+// GetAllRecipients returns all recipients (To, Cc, Bcc) as a single slice.
+func (m *Message) GetAllRecipients() []string {
+	var recipients []string
+	recipients = append(recipients, m.To...)
+	recipients = append(recipients, m.Cc...)
+	recipients = append(recipients, m.Bcc...)
+	return recipients
+}

plugin/email/message_test.go

@@ -0,0 +1,181 @@
+package email
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestMessageValidation(t *testing.T) {
+	tests := []struct {
+		name    string
+		msg     Message
+		wantErr bool
+	}{
+		{
+			name: "valid message",
+			msg: Message{
+				To:      []string{"user@example.com"},
+				Subject: "Test Subject",
+				Body:    "Test Body",
+			},
+			wantErr: false,
+		},
+		{
+			name: "no recipients",
+			msg: Message{
+				To:      []string{},
+				Subject: "Test Subject",
+				Body:    "Test Body",
+			},
+			wantErr: true,
+		},
+		{
+			name: "no subject",
+			msg: Message{
+				To:      []string{"user@example.com"},
+				Subject: "",
+				Body:    "Test Body",
+			},
+			wantErr: true,
+		},
+		{
+			name: "no body",
+			msg: Message{
+				To:      []string{"user@example.com"},
+				Subject: "Test Subject",
+				Body:    "",
+			},
+			wantErr: true,
+		},
+		{
+			name: "multiple recipients",
+			msg: Message{
+				To:      []string{"user1@example.com", "user2@example.com"},
+				Cc:      []string{"cc@example.com"},
+				Subject: "Test Subject",
+				Body:    "Test Body",
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.msg.Validate()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Validate() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
+
+func TestMessageFormatPlainText(t *testing.T) {
+	msg := Message{
+		To:      []string{"user@example.com"},
+		Subject: "Test Subject",
+		Body:    "Test Body",
+		IsHTML:  false,
+	}
+
+	formatted := msg.Format("sender@example.com", "Sender Name")
+
+	// Check required headers
+	if !strings.Contains(formatted, "From: Sender Name <sender@example.com>") {
+		t.Error("Missing or incorrect From header")
+	}
+	if !strings.Contains(formatted, "To: user@example.com") {
+		t.Error("Missing or incorrect To header")
+	}
+	if !strings.Contains(formatted, "Subject: Test Subject") {
+		t.Error("Missing or incorrect Subject header")
+	}
+	if !strings.Contains(formatted, "Content-Type: text/plain; charset=utf-8") {
+		t.Error("Missing or incorrect Content-Type header for plain text")
+	}
+	if !strings.Contains(formatted, "Test Body") {
+		t.Error("Missing message body")
+	}
+}
+
+func TestMessageFormatHTML(t *testing.T) {
+	msg := Message{
+		To:      []string{"user@example.com"},
+		Subject: "Test Subject",
+		Body:    "<html><body>Test Body</body></html>",
+		IsHTML:  true,
+	}
+
+	formatted := msg.Format("sender@example.com", "Sender Name")
+
+	// Check HTML content-type
+	if !strings.Contains(formatted, "Content-Type: text/html; charset=utf-8") {
+		t.Error("Missing or incorrect Content-Type header for HTML")
+	}
+	if !strings.Contains(formatted, "<html><body>Test Body</body></html>") {
+		t.Error("Missing HTML body")
+	}
+}
+
+func TestMessageFormatMultipleRecipients(t *testing.T) {
+	msg := Message{
+		To:      []string{"user1@example.com", "user2@example.com"},
+		Cc:      []string{"cc1@example.com", "cc2@example.com"},
+		Bcc:     []string{"bcc@example.com"},
+		Subject: "Test Subject",
+		Body:    "Test Body",
+		ReplyTo: "reply@example.com",
+	}
+
+	formatted := msg.Format("sender@example.com", "Sender Name")
+
+	// Check To header formatting
+	if !strings.Contains(formatted, "To: user1@example.com, user2@example.com") {
+		t.Error("Missing or incorrect To header with multiple recipients")
+	}
+	// Check Cc header formatting
+	if !strings.Contains(formatted, "Cc: cc1@example.com, cc2@example.com") {
+		t.Error("Missing or incorrect Cc header")
+	}
+	// Bcc should NOT appear in the formatted message
+	if strings.Contains(formatted, "Bcc:") {
+		t.Error("Bcc header should not appear in formatted message")
+	}
+	// Check Reply-To header
+	if !strings.Contains(formatted, "Reply-To: reply@example.com") {
+		t.Error("Missing or incorrect Reply-To header")
+	}
+}
+
+func TestGetAllRecipients(t *testing.T) {
+	msg := Message{
+		To:  []string{"user1@example.com", "user2@example.com"},
+		Cc:  []string{"cc@example.com"},
+		Bcc: []string{"bcc@example.com"},
+	}
+
+	recipients := msg.GetAllRecipients()
+
+	// Should have all 4 recipients
+	if len(recipients) != 4 {
+		t.Errorf("GetAllRecipients() returned %d recipients, want 4", len(recipients))
+	}
+
+	// Check all recipients are present
+	expectedRecipients := map[string]bool{
+		"user1@example.com": true,
+		"user2@example.com": true,
+		"cc@example.com":    true,
+		"bcc@example.com":   true,
+	}
+
+	for _, recipient := range recipients {
+		if !expectedRecipients[recipient] {
+			t.Errorf("Unexpected recipient: %s", recipient)
+		}
+		delete(expectedRecipients, recipient)
+	}
+
+	if len(expectedRecipients) > 0 {
+		t.Error("Not all expected recipients were returned")
+	}
+}

plugin/filter/MAINTENANCE.md

@@ -0,0 +1,50 @@
+# Maintaining the Memo Filter Engine
+
+The engine is memo-specific; any future field or behavior changes must stay
+consistent with the memo schema and store implementations. Use this guide when
+extending or debugging the package.
+
+## Adding a New Memo Field
+
+1. **Update the schema**  
+   - Add the field entry in `schema.go`.  
+   - Define the backing column (`Column`), JSON path (if applicable), type, and
+     allowed operators.  
+   - Include the CEL variable in `EnvOptions`.
+2. **Adjust parser or renderer (if needed)**  
+   - For non-scalar fields (JSON booleans, lists), add handling in
+     `parser.go` or extend the renderer helpers.  
+   - Keep validation in the parser (e.g., reject unsupported operators).
+3. **Write a golden test**  
+   - Extend the dialect-specific memo filter tests under
+     `store/db/{sqlite,mysql,postgres}/memo_filter_test.go` with a case that
+     exercises the new field.
+4. **Run `go test ./...`** to ensure the SQL output matches expectations across
+   all dialects.
+
+## Supporting Dialect Nuances
+
+- Centralize differences inside `render.go`. If a new dialect-specific behavior
+  emerges (e.g., JSON operators), add the logic there rather than leaking it
+  into store code.
+- Use the renderer helpers (`jsonExtractExpr`, `jsonArrayExpr`, etc.) rather than
+  sprinkling ad-hoc SQL strings.
+- When placeholders change, adjust `addArg` so that argument numbering stays in
+  sync with store queries.
+
+## Debugging Tips
+
+- **Parser errors** – Most originate in `buildCondition` or schema validation.
+  Enable logging around `parser.go` when diagnosing unknown identifier/operator
+  messages.
+- **Renderer output** – Temporary printf/log statements in `renderCondition` help
+  identify which IR node produced unexpected SQL.
+- **Store integration** – Ensure drivers call `filter.DefaultEngine()` exactly once
+  per process; the singleton caches the parsed CEL environment.
+
+## Testing Checklist
+
+- `go test ./store/...` ensures all dialect tests consume the engine correctly.
+- Add targeted unit tests whenever new IR nodes or renderer paths are introduced.
+- When changing boolean or JSON handling, verify all three dialect test suites
+  (SQLite, MySQL, Postgres) to avoid regression.

plugin/filter/README.md

@@ -0,0 +1,63 @@
+# Memo Filter Engine
+
+This package houses the memo-only filter engine that turns CEL expressions into
+SQL fragments. The engine follows a three phase pipeline inspired by systems
+such as Calcite or Prisma:
+
+1. **Parsing** – CEL expressions are parsed with `cel-go` and validated against
+   the memo-specific environment declared in `schema.go`. Only fields that
+   exist in the schema can surface in the filter.
+2. **Normalization** – the raw CEL AST is converted into an intermediate
+   representation (IR) defined in `ir.go`. The IR is a dialect-agnostic tree of
+   conditions (logical operators, comparisons, list membership, etc.). This
+   step enforces schema rules (e.g. operator compatibility, type checks).
+3. **Rendering** – the renderer in `render.go` walks the IR and produces a SQL
+   fragment plus placeholder arguments tailored to a target dialect
+   (`sqlite`, `mysql`, or `postgres`). Dialect differences such as JSON access,
+   boolean semantics, placeholders, and `LIKE` vs `ILIKE` are encapsulated in
+   renderer helpers.
+
+The entry point is `filter.DefaultEngine()` from `engine.go`. It lazily constructs
+an `Engine` configured with the memo schema and exposes:
+
+```go
+engine, _ := filter.DefaultEngine()
+stmt, _ := engine.CompileToStatement(ctx, `has_task_list && visibility == "PUBLIC"`, filter.RenderOptions{
+	Dialect: filter.DialectPostgres,
+})
+// stmt.SQL  -> "((memo.payload->'property'->>'hasTaskList')::boolean IS TRUE AND memo.visibility = $1)"
+// stmt.Args -> ["PUBLIC"]
+```
+
+## Core Files
+
+| File          | Responsibility                                                                  |
+| ------------- | ------------------------------------------------------------------------------- |
+| `schema.go`   | Declares memo fields, their types, backing columns, CEL environment options     |
+| `ir.go`       | IR node definitions used across the pipeline                                    |
+| `parser.go`   | Converts CEL `Expr` into IR while applying schema validation                    |
+| `render.go`   | Translates IR into SQL, handling dialect-specific behavior                      |
+| `engine.go`   | Glue between the phases; exposes `Compile`, `CompileToStatement`, and `DefaultEngine` |
+| `helpers.go`  | Convenience helpers for store integration (appending conditions)                |
+
+## SQL Generation Notes
+
+- **Placeholders** — `?` is used for SQLite/MySQL, `$n` for Postgres. The renderer
+  tracks offsets to compose queries with pre-existing arguments.
+- **JSON Fields** — Memo metadata lives in `memo.payload`. The renderer handles
+  `JSON_EXTRACT`/`json_extract`/`->`/`->>` variations and boolean coercion.
+- **Tag Operations** — `tag in [...]` and `"tag" in tags` become JSON array
+  predicates. SQLite uses `LIKE` patterns, MySQL uses `JSON_CONTAINS`, and
+  Postgres uses `@>`.
+- **Boolean Flags** — Fields such as `has_task_list` render as `IS TRUE` equality
+  checks, or comparisons against `CAST('true' AS JSON)` depending on the dialect.
+
+## Typical Integration
+
+1. Fetch the engine with `filter.DefaultEngine()`.
+2. Call `CompileToStatement` using the appropriate dialect enum.
+3. Append the emitted SQL fragment/args to the existing `WHERE` clause.
+4. Execute the resulting query through the store driver.
+
+The `helpers.AppendConditions` helper encapsulates steps 2–3 when a driver needs
+to process an array of filters.

plugin/filter/engine.go

@@ -0,0 +1,191 @@
+package filter
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+
+	"github.com/google/cel-go/cel"
+	"github.com/pkg/errors"
+)
+
+// Engine parses CEL filters into a dialect-agnostic condition tree.
+type Engine struct {
+	schema Schema
+	env    *cel.Env
+}
+
+// NewEngine builds a new Engine for the provided schema.
+func NewEngine(schema Schema) (*Engine, error) {
+	env, err := cel.NewEnv(schema.EnvOptions...)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create CEL environment")
+	}
+	return &Engine{
+		schema: schema,
+		env:    env,
+	}, nil
+}
+
+// Program stores a compiled filter condition.
+type Program struct {
+	schema    Schema
+	condition Condition
+}
+
+// ConditionTree exposes the underlying condition tree.
+func (p *Program) ConditionTree() Condition {
+	return p.condition
+}
+
+// Compile parses the filter string into an executable program.
+func (e *Engine) Compile(_ context.Context, filter string) (*Program, error) {
+	if strings.TrimSpace(filter) == "" {
+		return nil, errors.New("filter expression is empty")
+	}
+
+	filter = normalizeLegacyFilter(filter)
+
+	ast, issues := e.env.Compile(filter)
+	if issues != nil && issues.Err() != nil {
+		return nil, errors.Wrap(issues.Err(), "failed to compile filter")
+	}
+	parsed, err := cel.AstToParsedExpr(ast)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to convert AST")
+	}
+
+	cond, err := buildCondition(parsed.GetExpr(), e.schema)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Program{
+		schema:    e.schema,
+		condition: cond,
+	}, nil
+}
+
+// CompileToStatement compiles and renders the filter in a single step.
+func (e *Engine) CompileToStatement(ctx context.Context, filter string, opts RenderOptions) (Statement, error) {
+	program, err := e.Compile(ctx, filter)
+	if err != nil {
+		return Statement{}, err
+	}
+	return program.Render(opts)
+}
+
+// RenderOptions configure SQL rendering.
+type RenderOptions struct {
+	Dialect           DialectName
+	PlaceholderOffset int
+	DisableNullChecks bool
+}
+
+// Statement contains the rendered SQL fragment and its args.
+type Statement struct {
+	SQL  string
+	Args []any
+}
+
+// Render converts the program into a dialect-specific SQL fragment.
+func (p *Program) Render(opts RenderOptions) (Statement, error) {
+	renderer := newRenderer(p.schema, opts)
+	return renderer.Render(p.condition)
+}
+
+var (
+	defaultOnce           sync.Once
+	defaultInst           *Engine
+	defaultErr            error
+	defaultAttachmentOnce sync.Once
+	defaultAttachmentInst *Engine
+	defaultAttachmentErr  error
+)
+
+// DefaultEngine returns the process-wide memo filter engine.
+func DefaultEngine() (*Engine, error) {
+	defaultOnce.Do(func() {
+		defaultInst, defaultErr = NewEngine(NewSchema())
+	})
+	return defaultInst, defaultErr
+}
+
+// DefaultAttachmentEngine returns the process-wide attachment filter engine.
+func DefaultAttachmentEngine() (*Engine, error) {
+	defaultAttachmentOnce.Do(func() {
+		defaultAttachmentInst, defaultAttachmentErr = NewEngine(NewAttachmentSchema())
+	})
+	return defaultAttachmentInst, defaultAttachmentErr
+}
+
+func normalizeLegacyFilter(expr string) string {
+	expr = rewriteNumericLogicalOperand(expr, "&&")
+	expr = rewriteNumericLogicalOperand(expr, "||")
+	return expr
+}
+
+func rewriteNumericLogicalOperand(expr, op string) string {
+	var builder strings.Builder
+	n := len(expr)
+	i := 0
+	var inQuote rune
+
+	for i < n {
+		ch := expr[i]
+
+		if inQuote != 0 {
+			builder.WriteByte(ch)
+			if ch == '\\' && i+1 < n {
+				builder.WriteByte(expr[i+1])
+				i += 2
+				continue
+			}
+			if ch == byte(inQuote) {
+				inQuote = 0
+			}
+			i++
+			continue
+		}
+
+		if ch == '\'' || ch == '"' {
+			inQuote = rune(ch)
+			builder.WriteByte(ch)
+			i++
+			continue
+		}
+
+		if strings.HasPrefix(expr[i:], op) {
+			builder.WriteString(op)
+			i += len(op)
+
+			// Preserve whitespace following the operator.
+			wsStart := i
+			for i < n && (expr[i] == ' ' || expr[i] == '\t') {
+				i++
+			}
+			builder.WriteString(expr[wsStart:i])
+
+			signStart := i
+			if i < n && (expr[i] == '+' || expr[i] == '-') {
+				i++
+			}
+			for i < n && expr[i] >= '0' && expr[i] <= '9' {
+				i++
+			}
+			if i > signStart {
+				numLiteral := expr[signStart:i]
+				builder.WriteString(fmt.Sprintf("(%s != 0)", numLiteral))
+			} else {
+				builder.WriteString(expr[signStart:i])
+			}
+			continue
+		}
+
+		builder.WriteByte(ch)
+		i++
+	}
+
+	return builder.String()
+}

plugin/filter/helpers.go

@@ -0,0 +1,25 @@
+package filter
+
+import (
+	"context"
+	"fmt"
+)
+
+// AppendConditions compiles the provided filters and appends the resulting SQL fragments and args.
+func AppendConditions(ctx context.Context, engine *Engine, filters []string, dialect DialectName, where *[]string, args *[]any) error {
+	for _, filterStr := range filters {
+		stmt, err := engine.CompileToStatement(ctx, filterStr, RenderOptions{
+			Dialect:           dialect,
+			PlaceholderOffset: len(*args),
+		})
+		if err != nil {
+			return err
+		}
+		if stmt.SQL == "" {
+			continue
+		}
+		*where = append(*where, fmt.Sprintf("(%s)", stmt.SQL))
+		*args = append(*args, stmt.Args...)
+	}
+	return nil
+}

plugin/filter/ir.go

@@ -0,0 +1,159 @@
+package filter
+
+// Condition represents a boolean expression derived from the CEL filter.
+type Condition interface {
+	isCondition()
+}
+
+// LogicalOperator enumerates the supported logical operators.
+type LogicalOperator string
+
+const (
+	LogicalAnd LogicalOperator = "AND"
+	LogicalOr  LogicalOperator = "OR"
+)
+
+// LogicalCondition composes two conditions with a logical operator.
+type LogicalCondition struct {
+	Operator LogicalOperator
+	Left     Condition
+	Right    Condition
+}
+
+func (*LogicalCondition) isCondition() {}
+
+// NotCondition negates a child condition.
+type NotCondition struct {
+	Expr Condition
+}
+
+func (*NotCondition) isCondition() {}
+
+// FieldPredicateCondition asserts that a field evaluates to true.
+type FieldPredicateCondition struct {
+	Field string
+}
+
+func (*FieldPredicateCondition) isCondition() {}
+
+// ComparisonOperator lists supported comparison operators.
+type ComparisonOperator string
+
+const (
+	CompareEq  ComparisonOperator = "="
+	CompareNeq ComparisonOperator = "!="
+	CompareLt  ComparisonOperator = "<"
+	CompareLte ComparisonOperator = "<="
+	CompareGt  ComparisonOperator = ">"
+	CompareGte ComparisonOperator = ">="
+)
+
+// ComparisonCondition represents a binary comparison.
+type ComparisonCondition struct {
+	Left     ValueExpr
+	Operator ComparisonOperator
+	Right    ValueExpr
+}
+
+func (*ComparisonCondition) isCondition() {}
+
+// InCondition represents an IN predicate with literal list values.
+type InCondition struct {
+	Left   ValueExpr
+	Values []ValueExpr
+}
+
+func (*InCondition) isCondition() {}
+
+// ElementInCondition represents the CEL syntax `"value" in field`.
+type ElementInCondition struct {
+	Element ValueExpr
+	Field   string
+}
+
+func (*ElementInCondition) isCondition() {}
+
+// ContainsCondition models the <field>.contains(<value>) call.
+type ContainsCondition struct {
+	Field string
+	Value string
+}
+
+func (*ContainsCondition) isCondition() {}
+
+// ConstantCondition captures a literal boolean outcome.
+type ConstantCondition struct {
+	Value bool
+}
+
+func (*ConstantCondition) isCondition() {}
+
+// ValueExpr models arithmetic or scalar expressions whose result feeds a comparison.
+type ValueExpr interface {
+	isValueExpr()
+}
+
+// FieldRef references a named schema field.
+type FieldRef struct {
+	Name string
+}
+
+func (*FieldRef) isValueExpr() {}
+
+// LiteralValue holds a literal scalar.
+type LiteralValue struct {
+	Value interface{}
+}
+
+func (*LiteralValue) isValueExpr() {}
+
+// FunctionValue captures simple function calls like size(tags).
+type FunctionValue struct {
+	Name string
+	Args []ValueExpr
+}
+
+func (*FunctionValue) isValueExpr() {}
+
+// ListComprehensionCondition represents CEL macros like exists(), all(), filter().
+type ListComprehensionCondition struct {
+	Kind      ComprehensionKind
+	Field     string        // The list field to iterate over (e.g., "tags")
+	IterVar   string        // The iteration variable name (e.g., "t")
+	Predicate PredicateExpr // The predicate to evaluate for each element
+}
+
+func (*ListComprehensionCondition) isCondition() {}
+
+// ComprehensionKind enumerates the types of list comprehensions.
+type ComprehensionKind string
+
+const (
+	ComprehensionExists ComprehensionKind = "exists"
+)
+
+// PredicateExpr represents predicates used in comprehensions.
+type PredicateExpr interface {
+	isPredicateExpr()
+}
+
+// StartsWithPredicate represents t.startsWith("prefix").
+type StartsWithPredicate struct {
+	Prefix string
+}
+
+func (*StartsWithPredicate) isPredicateExpr() {}
+
+// EndsWithPredicate represents t.endsWith("suffix").
+type EndsWithPredicate struct {
+	Suffix string
+}
+
+func (*EndsWithPredicate) isPredicateExpr() {}
+
+// ContainsPredicate represents t.contains("substring").
+type ContainsPredicate struct {
+	Substring string
+}
+
+func (*ContainsPredicate) isPredicateExpr() {}

plugin/filter/parser.go

@@ -0,0 +1,586 @@
+package filter
+
+import (
+	"time"
+
+	"github.com/pkg/errors"
+	exprv1 "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
+)
+
+func buildCondition(expr *exprv1.Expr, schema Schema) (Condition, error) {
+	switch v := expr.ExprKind.(type) {
+	case *exprv1.Expr_CallExpr:
+		return buildCallCondition(v.CallExpr, schema)
+	case *exprv1.Expr_ConstExpr:
+		val, err := getConstValue(expr)
+		if err != nil {
+			return nil, err
+		}
+		switch v := val.(type) {
+		case bool:
+			return &ConstantCondition{Value: v}, nil
+		case int64:
+			return &ConstantCondition{Value: v != 0}, nil
+		case float64:
+			return &ConstantCondition{Value: v != 0}, nil
+		default:
+			return nil, errors.New("filter must evaluate to a boolean value")
+		}
+	case *exprv1.Expr_IdentExpr:
+		name := v.IdentExpr.GetName()
+		field, ok := schema.Field(name)
+		if !ok {
+			return nil, errors.Errorf("unknown identifier %q", name)
+		}
+		if field.Type != FieldTypeBool {
+			return nil, errors.Errorf("identifier %q is not boolean", name)
+		}
+		return &FieldPredicateCondition{Field: name}, nil
+	case *exprv1.Expr_ComprehensionExpr:
+		return buildComprehensionCondition(v.ComprehensionExpr, schema)
+	default:
+		return nil, errors.New("unsupported top-level expression")
+	}
+}
+
+func buildCallCondition(call *exprv1.Expr_Call, schema Schema) (Condition, error) {
+	switch call.Function {
+	case "_&&_":
+		if len(call.Args) != 2 {
+			return nil, errors.New("logical AND expects two arguments")
+		}
+		left, err := buildCondition(call.Args[0], schema)
+		if err != nil {
+			return nil, err
+		}
+		right, err := buildCondition(call.Args[1], schema)
+		if err != nil {
+			return nil, err
+		}
+		return &LogicalCondition{
+			Operator: LogicalAnd,
+			Left:     left,
+			Right:    right,
+		}, nil
+	case "_||_":
+		if len(call.Args) != 2 {
+			return nil, errors.New("logical OR expects two arguments")
+		}
+		left, err := buildCondition(call.Args[0], schema)
+		if err != nil {
+			return nil, err
+		}
+		right, err := buildCondition(call.Args[1], schema)
+		if err != nil {
+			return nil, err
+		}
+		return &LogicalCondition{
+			Operator: LogicalOr,
+			Left:     left,
+			Right:    right,
+		}, nil
+	case "!_":
+		if len(call.Args) != 1 {
+			return nil, errors.New("logical NOT expects one argument")
+		}
+		child, err := buildCondition(call.Args[0], schema)
+		if err != nil {
+			return nil, err
+		}
+		return &NotCondition{Expr: child}, nil
+	case "_==_", "_!=_", "_<_", "_>_", "_<=_", "_>=_":
+		return buildComparisonCondition(call, schema)
+	case "@in":
+		return buildInCondition(call, schema)
+	case "contains":
+		return buildContainsCondition(call, schema)
+	default:
+		val, ok, err := evaluateBool(call)
+		if err != nil {
+			return nil, err
+		}
+		if ok {
+			return &ConstantCondition{Value: val}, nil
+		}
+		return nil, errors.Errorf("unsupported call expression %q", call.Function)
+	}
+}
+
+func buildComparisonCondition(call *exprv1.Expr_Call, schema Schema) (Condition, error) {
+	if len(call.Args) != 2 {
+		return nil, errors.New("comparison expects two arguments")
+	}
+	op, err := toComparisonOperator(call.Function)
+	if err != nil {
+		return nil, err
+	}
+
+	left, err := buildValueExpr(call.Args[0], schema)
+	if err != nil {
+		return nil, err
+	}
+	right, err := buildValueExpr(call.Args[1], schema)
+	if err != nil {
+		return nil, err
+	}
+
+	// If the left side is a field, validate allowed operators.
+	if field, ok := left.(*FieldRef); ok {
+		def, exists := schema.Field(field.Name)
+		if !exists {
+			return nil, errors.Errorf("unknown identifier %q", field.Name)
+		}
+		if def.Kind == FieldKindVirtualAlias {
+			def, exists = schema.ResolveAlias(field.Name)
+			if !exists {
+				return nil, errors.Errorf("invalid alias %q", field.Name)
+			}
+		}
+		if def.AllowedComparisonOps != nil {
+			if _, allowed := def.AllowedComparisonOps[op]; !allowed {
+				return nil, errors.Errorf("operator %s not allowed for field %q", op, field.Name)
+			}
+		}
+	}
+
+	return &ComparisonCondition{
+		Left:     left,
+		Operator: op,
+		Right:    right,
+	}, nil
+}
+
+func buildInCondition(call *exprv1.Expr_Call, schema Schema) (Condition, error) {
+	if len(call.Args) != 2 {
+		return nil, errors.New("in operator expects two arguments")
+	}
+
+	// Handle identifier in list syntax.
+	if identName, err := getIdentName(call.Args[0]); err == nil {
+		if field, ok := schema.Field(identName); ok && field.Kind == FieldKindVirtualAlias {
+			if _, aliasOk := schema.ResolveAlias(identName); !aliasOk {
+				return nil, errors.Errorf("invalid alias %q", identName)
+			}
+		} else if !ok {
+			return nil, errors.Errorf("unknown identifier %q", identName)
+		}
+
+		if listExpr := call.Args[1].GetListExpr(); listExpr != nil {
+			values := make([]ValueExpr, 0, len(listExpr.Elements))
+			for _, element := range listExpr.Elements {
+				value, err := buildValueExpr(element, schema)
+				if err != nil {
+					return nil, err
+				}
+				values = append(values, value)
+			}
+			return &InCondition{
+				Left:   &FieldRef{Name: identName},
+				Values: values,
+			}, nil
+		}
+	}
+
+	// Handle "value in identifier" syntax.
+	if identName, err := getIdentName(call.Args[1]); err == nil {
+		if _, ok := schema.Field(identName); !ok {
+			return nil, errors.Errorf("unknown identifier %q", identName)
+		}
+		element, err := buildValueExpr(call.Args[0], schema)
+		if err != nil {
+			return nil, err
+		}
+		return &ElementInCondition{
+			Element: element,
+			Field:   identName,
+		}, nil
+	}
+
+	return nil, errors.New("invalid use of in operator")
+}
+
+func buildContainsCondition(call *exprv1.Expr_Call, schema Schema) (Condition, error) {
+	if call.Target == nil {
+		return nil, errors.New("contains requires a target")
+	}
+	targetName, err := getIdentName(call.Target)
+	if err != nil {
+		return nil, err
+	}
+
+	field, ok := schema.Field(targetName)
+	if !ok {
+		return nil, errors.Errorf("unknown identifier %q", targetName)
+	}
+	if !field.SupportsContains {
+		return nil, errors.Errorf("identifier %q does not support contains()", targetName)
+	}
+	if len(call.Args) != 1 {
+		return nil, errors.New("contains expects exactly one argument")
+	}
+	value, err := getConstValue(call.Args[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "contains only supports literal arguments")
+	}
+	str, ok := value.(string)
+	if !ok {
+		return nil, errors.New("contains argument must be a string")
+	}
+	return &ContainsCondition{
+		Field: targetName,
+		Value: str,
+	}, nil
+}
+
+func buildValueExpr(expr *exprv1.Expr, schema Schema) (ValueExpr, error) {
+	if identName, err := getIdentName(expr); err == nil {
+		if _, ok := schema.Field(identName); !ok {
+			return nil, errors.Errorf("unknown identifier %q", identName)
+		}
+		return &FieldRef{Name: identName}, nil
+	}
+
+	if literal, err := getConstValue(expr); err == nil {
+		return &LiteralValue{Value: literal}, nil
+	}
+
+	if value, ok, err := evaluateNumeric(expr); err != nil {
+		return nil, err
+	} else if ok {
+		return &LiteralValue{Value: value}, nil
+	}
+
+	if boolVal, ok, err := evaluateBoolExpr(expr); err != nil {
+		return nil, err
+	} else if ok {
+		return &LiteralValue{Value: boolVal}, nil
+	}
+
+	if call := expr.GetCallExpr(); call != nil {
+		switch call.Function {
+		case "size":
+			if len(call.Args) != 1 {
+				return nil, errors.New("size() expects one argument")
+			}
+			arg, err := buildValueExpr(call.Args[0], schema)
+			if err != nil {
+				return nil, err
+			}
+			return &FunctionValue{
+				Name: "size",
+				Args: []ValueExpr{arg},
+			}, nil
+		case "now":
+			return &LiteralValue{Value: timeNowUnix()}, nil
+		case "_+_", "_-_", "_*_":
+			value, ok, err := evaluateNumeric(expr)
+			if err != nil {
+				return nil, err
+			}
+			if ok {
+				return &LiteralValue{Value: value}, nil
+			}
+		default:
+			// Fall through to error return below
+		}
+	}
+
+	return nil, errors.New("unsupported value expression")
+}
+
+func toComparisonOperator(fn string) (ComparisonOperator, error) {
+	switch fn {
+	case "_==_":
+		return CompareEq, nil
+	case "_!=_":
+		return CompareNeq, nil
+	case "_<_":
+		return CompareLt, nil
+	case "_>_":
+		return CompareGt, nil
+	case "_<=_":
+		return CompareLte, nil
+	case "_>=_":
+		return CompareGte, nil
+	default:
+		return "", errors.Errorf("unsupported comparison operator %q", fn)
+	}
+}
+
+func getIdentName(expr *exprv1.Expr) (string, error) {
+	if ident := expr.GetIdentExpr(); ident != nil {
+		return ident.GetName(), nil
+	}
+	return "", errors.New("expression is not an identifier")
+}
+
+func getConstValue(expr *exprv1.Expr) (interface{}, error) {
+	v, ok := expr.ExprKind.(*exprv1.Expr_ConstExpr)
+	if !ok {
+		return nil, errors.New("expression is not a literal")
+	}
+	switch x := v.ConstExpr.ConstantKind.(type) {
+	case *exprv1.Constant_StringValue:
+		return v.ConstExpr.GetStringValue(), nil
+	case *exprv1.Constant_Int64Value:
+		return v.ConstExpr.GetInt64Value(), nil
+	case *exprv1.Constant_Uint64Value:
+		return int64(v.ConstExpr.GetUint64Value()), nil
+	case *exprv1.Constant_DoubleValue:
+		return v.ConstExpr.GetDoubleValue(), nil
+	case *exprv1.Constant_BoolValue:
+		return v.ConstExpr.GetBoolValue(), nil
+	case *exprv1.Constant_NullValue:
+		return nil, nil
+	default:
+		return nil, errors.Errorf("unsupported constant %T", x)
+	}
+}
+
+func evaluateBool(call *exprv1.Expr_Call) (bool, bool, error) {
+	val, ok, err := evaluateBoolExpr(&exprv1.Expr{ExprKind: &exprv1.Expr_CallExpr{CallExpr: call}})
+	return val, ok, err
+}
+
+func evaluateBoolExpr(expr *exprv1.Expr) (bool, bool, error) {
+	if literal, err := getConstValue(expr); err == nil {
+		if b, ok := literal.(bool); ok {
+			return b, true, nil
+		}
+		return false, false, nil
+	}
+	if call := expr.GetCallExpr(); call != nil && call.Function == "!_" {
+		if len(call.Args) != 1 {
+			return false, false, errors.New("NOT expects exactly one argument")
+		}
+		val, ok, err := evaluateBoolExpr(call.Args[0])
+		if err != nil || !ok {
+			return false, false, err
+		}
+		return !val, true, nil
+	}
+	return false, false, nil
+}
+
+func evaluateNumeric(expr *exprv1.Expr) (int64, bool, error) {
+	if literal, err := getConstValue(expr); err == nil {
+		switch v := literal.(type) {
+		case int64:
+			return v, true, nil
+		case float64:
+			return int64(v), true, nil
+		}
+		return 0, false, nil
+	}
+
+	call := expr.GetCallExpr()
+	if call == nil {
+		return 0, false, nil
+	}
+
+	switch call.Function {
+	case "now":
+		return timeNowUnix(), true, nil
+	case "_+_", "_-_", "_*_":
+		if len(call.Args) != 2 {
+			return 0, false, errors.New("arithmetic requires two arguments")
+		}
+		left, ok, err := evaluateNumeric(call.Args[0])
+		if err != nil {
+			return 0, false, err
+		}
+		if !ok {
+			return 0, false, nil
+		}
+		right, ok, err := evaluateNumeric(call.Args[1])
+		if err != nil {
+			return 0, false, err
+		}
+		if !ok {
+			return 0, false, nil
+		}
+		switch call.Function {
+		case "_+_":
+			return left + right, true, nil
+		case "_-_":
+			return left - right, true, nil
+		case "_*_":
+			return left * right, true, nil
+		default:
+			return 0, false, errors.Errorf("unsupported arithmetic operator %q", call.Function)
+		}
+	default:
+		return 0, false, nil
+	}
+}
+
+func timeNowUnix() int64 {
+	return time.Now().Unix()
+}
+
+// buildComprehensionCondition handles CEL comprehension expressions (exists, all, etc.).
+func buildComprehensionCondition(comp *exprv1.Expr_Comprehension, schema Schema) (Condition, error) {
+	// Determine the comprehension kind by examining the loop initialization and step
+	kind, err := detectComprehensionKind(comp)
+	if err != nil {
+		return nil, err
+	}
+
+	// Get the field being iterated over
+	iterRangeIdent := comp.IterRange.GetIdentExpr()
+	if iterRangeIdent == nil {
+		return nil, errors.New("comprehension range must be a field identifier")
+	}
+	fieldName := iterRangeIdent.GetName()
+
+	// Validate the field
+	field, ok := schema.Field(fieldName)
+	if !ok {
+		return nil, errors.Errorf("unknown field %q in comprehension", fieldName)
+	}
+	if field.Kind != FieldKindJSONList {
+		return nil, errors.Errorf("field %q does not support comprehension (must be a list)", fieldName)
+	}
+
+	// Extract the predicate from the loop step
+	predicate, err := extractPredicate(comp, schema)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ListComprehensionCondition{
+		Kind:      kind,
+		Field:     fieldName,
+		IterVar:   comp.IterVar,
+		Predicate: predicate,
+	}, nil
+}
+
+// detectComprehensionKind determines if this is an exists() macro.
+// Only exists() is currently supported.
+func detectComprehensionKind(comp *exprv1.Expr_Comprehension) (ComprehensionKind, error) {
+	// Check the accumulator initialization
+	accuInit := comp.AccuInit.GetConstExpr()
+	if accuInit == nil {
+		return "", errors.New("comprehension accumulator must be initialized with a constant")
+	}
+
+	// exists() starts with false and uses OR (||) in loop step
+	if !accuInit.GetBoolValue() {
+		if step := comp.LoopStep.GetCallExpr(); step != nil && step.Function == "_||_" {
+			return ComprehensionExists, nil
+		}
+	}
+
+	// all() starts with true and uses AND (&&) - not supported
+	if accuInit.GetBoolValue() {
+		if step := comp.LoopStep.GetCallExpr(); step != nil && step.Function == "_&&_" {
+			return "", errors.New("all() comprehension is not supported; use exists() instead")
+		}
+	}
+
+	return "", errors.New("unsupported comprehension type; only exists() is supported")
+}
+
+// extractPredicate extracts the predicate expression from the comprehension loop step.
+func extractPredicate(comp *exprv1.Expr_Comprehension, _ Schema) (PredicateExpr, error) {
+	// The loop step is: @result || predicate(t) for exists
+	//                or: @result && predicate(t) for all
+	step := comp.LoopStep.GetCallExpr()
+	if step == nil {
+		return nil, errors.New("comprehension loop step must be a call expression")
+	}
+
+	if len(step.Args) != 2 {
+		return nil, errors.New("comprehension loop step must have two arguments")
+	}
+
+	// The predicate is the second argument
+	predicateExpr := step.Args[1]
+	predicateCall := predicateExpr.GetCallExpr()
+	if predicateCall == nil {
+		return nil, errors.New("comprehension predicate must be a function call")
+	}
+
+	// Handle different predicate functions
+	switch predicateCall.Function {
+	case "startsWith":
+		return buildStartsWithPredicate(predicateCall, comp.IterVar)
+	case "endsWith":
+		return buildEndsWithPredicate(predicateCall, comp.IterVar)
+	case "contains":
+		return buildContainsPredicate(predicateCall, comp.IterVar)
+	default:
+		return nil, errors.Errorf("unsupported predicate function %q in comprehension (supported: startsWith, endsWith, contains)", predicateCall.Function)
+	}
+}
+
+// buildStartsWithPredicate extracts the pattern from t.startsWith("prefix").
+func buildStartsWithPredicate(call *exprv1.Expr_Call, iterVar string) (PredicateExpr, error) {
+	// Verify the target is the iteration variable
+	if target := call.Target.GetIdentExpr(); target == nil || target.GetName() != iterVar {
+		return nil, errors.Errorf("startsWith target must be the iteration variable %q", iterVar)
+	}
+
+	if len(call.Args) != 1 {
+		return nil, errors.New("startsWith expects exactly one argument")
+	}
+
+	prefix, err := getConstValue(call.Args[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "startsWith argument must be a constant string")
+	}
+
+	prefixStr, ok := prefix.(string)
+	if !ok {
+		return nil, errors.New("startsWith argument must be a string")
+	}
+
+	return &StartsWithPredicate{Prefix: prefixStr}, nil
+}
+
+// buildEndsWithPredicate extracts the pattern from t.endsWith("suffix").
+func buildEndsWithPredicate(call *exprv1.Expr_Call, iterVar string) (PredicateExpr, error) {
+	if target := call.Target.GetIdentExpr(); target == nil || target.GetName() != iterVar {
+		return nil, errors.Errorf("endsWith target must be the iteration variable %q", iterVar)
+	}
+
+	if len(call.Args) != 1 {
+		return nil, errors.New("endsWith expects exactly one argument")
+	}
+
+	suffix, err := getConstValue(call.Args[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "endsWith argument must be a constant string")
+	}
+
+	suffixStr, ok := suffix.(string)
+	if !ok {
+		return nil, errors.New("endsWith argument must be a string")
+	}
+
+	return &EndsWithPredicate{Suffix: suffixStr}, nil
+}
+
+// buildContainsPredicate extracts the pattern from t.contains("substring").
+func buildContainsPredicate(call *exprv1.Expr_Call, iterVar string) (PredicateExpr, error) {
+	if target := call.Target.GetIdentExpr(); target == nil || target.GetName() != iterVar {
+		return nil, errors.Errorf("contains target must be the iteration variable %q", iterVar)
+	}
+
+	if len(call.Args) != 1 {
+		return nil, errors.New("contains expects exactly one argument")
+	}
+
+	substring, err := getConstValue(call.Args[0])
+	if err != nil {
+		return nil, errors.Wrap(err, "contains argument must be a constant string")
+	}
+
+	substringStr, ok := substring.(string)
+	if !ok {
+		return nil, errors.New("contains argument must be a string")
+	}
+
+	return &ContainsPredicate{Substring: substringStr}, nil
+}

plugin/filter/render.go

@@ -0,0 +1,748 @@
+package filter
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+type renderer struct {
+	schema             Schema
+	dialect            DialectName
+	placeholderOffset  int
+	placeholderCounter int
+	args               []any
+}
+
+type renderResult struct {
+	sql           string
+	trivial       bool
+	unsatisfiable bool
+}
+
+func newRenderer(schema Schema, opts RenderOptions) *renderer {
+	return &renderer{
+		schema:            schema,
+		dialect:           opts.Dialect,
+		placeholderOffset: opts.PlaceholderOffset,
+	}
+}
+
+func (r *renderer) Render(cond Condition) (Statement, error) {
+	result, err := r.renderCondition(cond)
+	if err != nil {
+		return Statement{}, err
+	}
+	args := r.args
+	if args == nil {
+		args = []any{}
+	}
+
+	switch {
+	case result.unsatisfiable:
+		return Statement{
+			SQL:  "1 = 0",
+			Args: args,
+		}, nil
+	case result.trivial:
+		return Statement{
+			SQL:  "",
+			Args: args,
+		}, nil
+	default:
+		return Statement{
+			SQL:  result.sql,
+			Args: args,
+		}, nil
+	}
+}
+
+func (r *renderer) renderCondition(cond Condition) (renderResult, error) {
+	switch c := cond.(type) {
+	case *LogicalCondition:
+		return r.renderLogicalCondition(c)
+	case *NotCondition:
+		return r.renderNotCondition(c)
+	case *FieldPredicateCondition:
+		return r.renderFieldPredicate(c)
+	case *ComparisonCondition:
+		return r.renderComparison(c)
+	case *InCondition:
+		return r.renderInCondition(c)
+	case *ElementInCondition:
+		return r.renderElementInCondition(c)
+	case *ContainsCondition:
+		return r.renderContainsCondition(c)
+	case *ListComprehensionCondition:
+		return r.renderListComprehension(c)
+	case *ConstantCondition:
+		if c.Value {
+			return renderResult{trivial: true}, nil
+		}
+		return renderResult{sql: "1 = 0", unsatisfiable: true}, nil
+	default:
+		return renderResult{}, errors.Errorf("unsupported condition type %T", c)
+	}
+}
+
+func (r *renderer) renderLogicalCondition(cond *LogicalCondition) (renderResult, error) {
+	left, err := r.renderCondition(cond.Left)
+	if err != nil {
+		return renderResult{}, err
+	}
+	right, err := r.renderCondition(cond.Right)
+	if err != nil {
+		return renderResult{}, err
+	}
+
+	switch cond.Operator {
+	case LogicalAnd:
+		return combineAnd(left, right), nil
+	case LogicalOr:
+		return combineOr(left, right), nil
+	default:
+		return renderResult{}, errors.Errorf("unsupported logical operator %s", cond.Operator)
+	}
+}
+
+func (r *renderer) renderNotCondition(cond *NotCondition) (renderResult, error) {
+	child, err := r.renderCondition(cond.Expr)
+	if err != nil {
+		return renderResult{}, err
+	}
+
+	if child.trivial {
+		return renderResult{sql: "1 = 0", unsatisfiable: true}, nil
+	}
+	if child.unsatisfiable {
+		return renderResult{trivial: true}, nil
+	}
+	return renderResult{
+		sql: fmt.Sprintf("NOT (%s)", child.sql),
+	}, nil
+}
+
+func (r *renderer) renderFieldPredicate(cond *FieldPredicateCondition) (renderResult, error) {
+	field, ok := r.schema.Field(cond.Field)
+	if !ok {
+		return renderResult{}, errors.Errorf("unknown field %q", cond.Field)
+	}
+
+	switch field.Kind {
+	case FieldKindBoolColumn:
+		column := qualifyColumn(r.dialect, field.Column)
+		return renderResult{
+			sql: fmt.Sprintf("%s IS TRUE", column),
+		}, nil
+	case FieldKindJSONBool:
+		sql, err := r.jsonBoolPredicate(field)
+		if err != nil {
+			return renderResult{}, err
+		}
+		return renderResult{sql: sql}, nil
+	default:
+		return renderResult{}, errors.Errorf("field %q cannot be used as a predicate", cond.Field)
+	}
+}
+
+func (r *renderer) renderComparison(cond *ComparisonCondition) (renderResult, error) {
+	switch left := cond.Left.(type) {
+	case *FieldRef:
+		field, ok := r.schema.Field(left.Name)
+		if !ok {
+			return renderResult{}, errors.Errorf("unknown field %q", left.Name)
+		}
+		switch field.Kind {
+		case FieldKindBoolColumn:
+			return r.renderBoolColumnComparison(field, cond.Operator, cond.Right)
+		case FieldKindJSONBool:
+			return r.renderJSONBoolComparison(field, cond.Operator, cond.Right)
+		case FieldKindScalar:
+			return r.renderScalarComparison(field, cond.Operator, cond.Right)
+		default:
+			return renderResult{}, errors.Errorf("field %q does not support comparison", field.Name)
+		}
+	case *FunctionValue:
+		return r.renderFunctionComparison(left, cond.Operator, cond.Right)
+	default:
+		return renderResult{}, errors.New("comparison must start with a field reference or supported function")
+	}
+}
+
+func (r *renderer) renderFunctionComparison(fn *FunctionValue, op ComparisonOperator, right ValueExpr) (renderResult, error) {
+	if fn.Name != "size" {
+		return renderResult{}, errors.Errorf("unsupported function %s in comparison", fn.Name)
+	}
+	if len(fn.Args) != 1 {
+		return renderResult{}, errors.New("size() expects one argument")
+	}
+	fieldArg, ok := fn.Args[0].(*FieldRef)
+	if !ok {
+		return renderResult{}, errors.New("size() argument must be a field")
+	}
+
+	field, ok := r.schema.Field(fieldArg.Name)
+	if !ok {
+		return renderResult{}, errors.Errorf("unknown field %q", fieldArg.Name)
+	}
+	if field.Kind != FieldKindJSONList {
+		return renderResult{}, errors.Errorf("size() only supports tag lists, got %q", field.Name)
+	}
+
+	value, err := expectNumericLiteral(right)
+	if err != nil {
+		return renderResult{}, err
+	}
+
+	expr := jsonArrayLengthExpr(r.dialect, field)
+	placeholder := r.addArg(value)
+	return renderResult{
+		sql: fmt.Sprintf("%s %s %s", expr, sqlOperator(op), placeholder),
+	}, nil
+}
+
+func (r *renderer) renderScalarComparison(field Field, op ComparisonOperator, right ValueExpr) (renderResult, error) {
+	lit, err := expectLiteral(right)
+	if err != nil {
+		return renderResult{}, err
+	}
+
+	columnExpr := field.columnExpr(r.dialect)
+	if lit == nil {
+		switch op {
+		case CompareEq:
+			return renderResult{sql: fmt.Sprintf("%s IS NULL", columnExpr)}, nil
+		case CompareNeq:
+			return renderResult{sql: fmt.Sprintf("%s IS NOT NULL", columnExpr)}, nil
+		default:
+			return renderResult{}, errors.Errorf("operator %s not supported for null comparison", op)
+		}
+	}
+
+	placeholder := ""
+	switch field.Type {
+	case FieldTypeString:
+		value, ok := lit.(string)
+		if !ok {
+			return renderResult{}, errors.Errorf("field %q expects string value", field.Name)
+		}
+		placeholder = r.addArg(value)
+	case FieldTypeInt, FieldTypeTimestamp:
+		num, err := toInt64(lit)
+		if err != nil {
+			return renderResult{}, errors.Wrapf(err, "field %q expects integer value", field.Name)
+		}
+		placeholder = r.addArg(num)
+	default:
+		return renderResult{}, errors.Errorf("unsupported data type %q for field %s", field.Type, field.Name)
+	}
+
+	return renderResult{
+		sql: fmt.Sprintf("%s %s %s", columnExpr, sqlOperator(op), placeholder),
+	}, nil
+}
+
+func (r *renderer) renderBoolColumnComparison(field Field, op ComparisonOperator, right ValueExpr) (renderResult, error) {
+	value, err := expectBool(right)
+	if err != nil {
+		return renderResult{}, err
+	}
+	placeholder := r.addBoolArg(value)
+	column := qualifyColumn(r.dialect, field.Column)
+	return renderResult{
+		sql: fmt.Sprintf("%s %s %s", column, sqlOperator(op), placeholder),
+	}, nil
+}
+
+func (r *renderer) renderJSONBoolComparison(field Field, op ComparisonOperator, right ValueExpr) (renderResult, error) {
+	value, err := expectBool(right)
+	if err != nil {
+		return renderResult{}, err
+	}
+
+	jsonExpr := jsonExtractExpr(r.dialect, field)
+	switch r.dialect {
+	case DialectSQLite:
+		switch op {
+		case CompareEq:
+			if field.Name == "has_task_list" {
+				target := "0"
+				if value {
+					target = "1"
+				}
+				return renderResult{sql: fmt.Sprintf("%s = %s", jsonExpr, target)}, nil
+			}
+			if value {
+				return renderResult{sql: fmt.Sprintf("%s IS TRUE", jsonExpr)}, nil
+			}
+			return renderResult{sql: fmt.Sprintf("NOT(%s IS TRUE)", jsonExpr)}, nil
+		case CompareNeq:
+			if field.Name == "has_task_list" {
+				target := "0"
+				if value {
+					target = "1"
+				}
+				return renderResult{sql: fmt.Sprintf("%s != %s", jsonExpr, target)}, nil
+			}
+			if value {
+				return renderResult{sql: fmt.Sprintf("NOT(%s IS TRUE)", jsonExpr)}, nil
+			}
+			return renderResult{sql: fmt.Sprintf("%s IS TRUE", jsonExpr)}, nil
+		default:
+			return renderResult{}, errors.Errorf("operator %s not supported for boolean JSON field", op)
+		}
+	case DialectMySQL:
+		boolStr := "false"
+		if value {
+			boolStr = "true"
+		}
+		return renderResult{
+			sql: fmt.Sprintf("%s %s CAST('%s' AS JSON)", jsonExpr, sqlOperator(op), boolStr),
+		}, nil
+	case DialectPostgres:
+		placeholder := r.addArg(value)
+		return renderResult{
+			sql: fmt.Sprintf("(%s)::boolean %s %s", jsonExpr, sqlOperator(op), placeholder),
+		}, nil
+	default:
+		return renderResult{}, errors.Errorf("unsupported dialect %s", r.dialect)
+	}
+}
+
+func (r *renderer) renderInCondition(cond *InCondition) (renderResult, error) {
+	fieldRef, ok := cond.Left.(*FieldRef)
+	if !ok {
+		return renderResult{}, errors.New("IN operator requires a field on the left-hand side")
+	}
+
+	if fieldRef.Name == "tag" {
+		return r.renderTagInList(cond.Values)
+	}
+
+	field, ok := r.schema.Field(fieldRef.Name)
+	if !ok {
+		return renderResult{}, errors.Errorf("unknown field %q", fieldRef.Name)
+	}
+
+	if field.Kind != FieldKindScalar {
+		return renderResult{}, errors.Errorf("field %q does not support IN()", fieldRef.Name)
+	}
+
+	return r.renderScalarInCondition(field, cond.Values)
+}
+
+func (r *renderer) renderTagInList(values []ValueExpr) (renderResult, error) {
+	field, ok := r.schema.ResolveAlias("tag")
+	if !ok {
+		return renderResult{}, errors.New("tag attribute is not configured")
+	}
+
+	conditions := make([]string, 0, len(values))
+	for _, v := range values {
+		lit, err := expectLiteral(v)
+		if err != nil {
+			return renderResult{}, err
+		}
+		str, ok := lit.(string)
+		if !ok {
+			return renderResult{}, errors.New("tags must be compared with string literals")
+		}
+
+		switch r.dialect {
+		case DialectSQLite:
+			// Support hierarchical tags: match exact tag OR tags with this prefix (e.g., "book" matches "book" and "book/something")
+			exactMatch := fmt.Sprintf("%s LIKE %s", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`%%"%s"%%`, str)))
+			prefixMatch := fmt.Sprintf("%s LIKE %s", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`%%"%s/%%`, str)))
+			expr := fmt.Sprintf("(%s OR %s)", exactMatch, prefixMatch)
+			conditions = append(conditions, expr)
+		case DialectMySQL:
+			// Support hierarchical tags: match exact tag OR tags with this prefix
+			exactMatch := fmt.Sprintf("JSON_CONTAINS(%s, %s)", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`"%s"`, str)))
+			prefixMatch := fmt.Sprintf("%s LIKE %s", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`%%"%s/%%`, str)))
+			expr := fmt.Sprintf("(%s OR %s)", exactMatch, prefixMatch)
+			conditions = append(conditions, expr)
+		case DialectPostgres:
+			// Support hierarchical tags: match exact tag OR tags with this prefix
+			exactMatch := fmt.Sprintf("%s @> jsonb_build_array(%s::json)", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`"%s"`, str)))
+			prefixMatch := fmt.Sprintf("(%s)::text LIKE %s", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`%%"%s/%%`, str)))
+			expr := fmt.Sprintf("(%s OR %s)", exactMatch, prefixMatch)
+			conditions = append(conditions, expr)
+		default:
+			return renderResult{}, errors.Errorf("unsupported dialect %s", r.dialect)
+		}
+	}
+
+	if len(conditions) == 1 {
+		return renderResult{sql: conditions[0]}, nil
+	}
+	return renderResult{
+		sql: fmt.Sprintf("(%s)", strings.Join(conditions, " OR ")),
+	}, nil
+}
+
+func (r *renderer) renderElementInCondition(cond *ElementInCondition) (renderResult, error) {
+	field, ok := r.schema.Field(cond.Field)
+	if !ok {
+		return renderResult{}, errors.Errorf("unknown field %q", cond.Field)
+	}
+	if field.Kind != FieldKindJSONList {
+		return renderResult{}, errors.Errorf("field %q is not a tag list", cond.Field)
+	}
+
+	lit, err := expectLiteral(cond.Element)
+	if err != nil {
+		return renderResult{}, err
+	}
+	str, ok := lit.(string)
+	if !ok {
+		return renderResult{}, errors.New("tags membership requires string literal")
+	}
+
+	switch r.dialect {
+	case DialectSQLite:
+		sql := fmt.Sprintf("%s LIKE %s", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`%%"%s"%%`, str)))
+		return renderResult{sql: sql}, nil
+	case DialectMySQL:
+		sql := fmt.Sprintf("JSON_CONTAINS(%s, %s)", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`"%s"`, str)))
+		return renderResult{sql: sql}, nil
+	case DialectPostgres:
+		sql := fmt.Sprintf("%s @> jsonb_build_array(%s::json)", jsonArrayExpr(r.dialect, field), r.addArg(fmt.Sprintf(`"%s"`, str)))
+		return renderResult{sql: sql}, nil
+	default:
+		return renderResult{}, errors.Errorf("unsupported dialect %s", r.dialect)
+	}
+}
+
+func (r *renderer) renderScalarInCondition(field Field, values []ValueExpr) (renderResult, error) {
+	placeholders := make([]string, 0, len(values))
+
+	for _, v := range values {
+		lit, err := expectLiteral(v)
+		if err != nil {
+			return renderResult{}, err
+		}
+		switch field.Type {
+		case FieldTypeString:
+			str, ok := lit.(string)
+			if !ok {
+				return renderResult{}, errors.Errorf("field %q expects string values", field.Name)
+			}
+			placeholders = append(placeholders, r.addArg(str))
+		case FieldTypeInt:
+			num, err := toInt64(lit)
+			if err != nil {
+				return renderResult{}, err
+			}
+			placeholders = append(placeholders, r.addArg(num))
+		default:
+			return renderResult{}, errors.Errorf("field %q does not support IN() comparisons", field.Name)
+		}
+	}
+
+	column := field.columnExpr(r.dialect)
+	return renderResult{
+		sql: fmt.Sprintf("%s IN (%s)", column, strings.Join(placeholders, ",")),
+	}, nil
+}
+
+func (r *renderer) renderContainsCondition(cond *ContainsCondition) (renderResult, error) {
+	field, ok := r.schema.Field(cond.Field)
+	if !ok {
+		return renderResult{}, errors.Errorf("unknown field %q", cond.Field)
+	}
+	column := field.columnExpr(r.dialect)
+	arg := fmt.Sprintf("%%%s%%", cond.Value)
+	switch r.dialect {
+	case DialectSQLite:
+		// Use custom Unicode-aware case folding function for case-insensitive comparison.
+		// This overcomes SQLite's ASCII-only LOWER() limitation.
+		sql := fmt.Sprintf("memos_unicode_lower(%s) LIKE memos_unicode_lower(%s)", column, r.addArg(arg))
+		return renderResult{sql: sql}, nil
+	case DialectPostgres:
+		sql := fmt.Sprintf("%s ILIKE %s", column, r.addArg(arg))
+		return renderResult{sql: sql}, nil
+	default:
+		sql := fmt.Sprintf("%s LIKE %s", column, r.addArg(arg))
+		return renderResult{sql: sql}, nil
+	}
+}
+
+func (r *renderer) renderListComprehension(cond *ListComprehensionCondition) (renderResult, error) {
+	field, ok := r.schema.Field(cond.Field)
+	if !ok {
+		return renderResult{}, errors.Errorf("unknown field %q", cond.Field)
+	}
+
+	if field.Kind != FieldKindJSONList {
+		return renderResult{}, errors.Errorf("field %q is not a JSON list", cond.Field)
+	}
+
+	// Render based on predicate type
+	switch pred := cond.Predicate.(type) {
+	case *StartsWithPredicate:
+		return r.renderTagStartsWith(field, pred.Prefix, cond.Kind)
+	case *EndsWithPredicate:
+		return r.renderTagEndsWith(field, pred.Suffix, cond.Kind)
+	case *ContainsPredicate:
+		return r.renderTagContains(field, pred.Substring, cond.Kind)
+	default:
+		return renderResult{}, errors.Errorf("unsupported predicate type %T in comprehension", pred)
+	}
+}
+
+// renderTagStartsWith generates SQL for tags.exists(t, t.startsWith("prefix")).
+func (r *renderer) renderTagStartsWith(field Field, prefix string, _ ComprehensionKind) (renderResult, error) {
+	arrayExpr := jsonArrayExpr(r.dialect, field)
+
+	switch r.dialect {
+	case DialectSQLite, DialectMySQL:
+		// Match exact tag or tags with this prefix (hierarchical support)
+		exactMatch := r.buildJSONArrayLike(arrayExpr, fmt.Sprintf(`%%"%s"%%`, prefix))
+		prefixMatch := r.buildJSONArrayLike(arrayExpr, fmt.Sprintf(`%%"%s%%`, prefix))
+		condition := fmt.Sprintf("(%s OR %s)", exactMatch, prefixMatch)
+		return renderResult{sql: r.wrapWithNullCheck(arrayExpr, condition)}, nil
+
+	case DialectPostgres:
+		// Use PostgreSQL's powerful JSON operators
+		exactMatch := fmt.Sprintf("%s @> jsonb_build_array(%s::json)", arrayExpr, r.addArg(fmt.Sprintf(`"%s"`, prefix)))
+		prefixMatch := fmt.Sprintf("(%s)::text LIKE %s", arrayExpr, r.addArg(fmt.Sprintf(`%%"%s%%`, prefix)))
+		condition := fmt.Sprintf("(%s OR %s)", exactMatch, prefixMatch)
+		return renderResult{sql: r.wrapWithNullCheck(arrayExpr, condition)}, nil
+
+	default:
+		return renderResult{}, errors.Errorf("unsupported dialect %s", r.dialect)
+	}
+}
+
+// renderTagEndsWith generates SQL for tags.exists(t, t.endsWith("suffix")).
+func (r *renderer) renderTagEndsWith(field Field, suffix string, _ ComprehensionKind) (renderResult, error) {
+	arrayExpr := jsonArrayExpr(r.dialect, field)
+	pattern := fmt.Sprintf(`%%%s"%%`, suffix)
+
+	likeExpr := r.buildJSONArrayLike(arrayExpr, pattern)
+	return renderResult{sql: r.wrapWithNullCheck(arrayExpr, likeExpr)}, nil
+}
+
+// renderTagContains generates SQL for tags.exists(t, t.contains("substring")).
+func (r *renderer) renderTagContains(field Field, substring string, _ ComprehensionKind) (renderResult, error) {
+	arrayExpr := jsonArrayExpr(r.dialect, field)
+	pattern := fmt.Sprintf(`%%%s%%`, substring)
+
+	likeExpr := r.buildJSONArrayLike(arrayExpr, pattern)
+	return renderResult{sql: r.wrapWithNullCheck(arrayExpr, likeExpr)}, nil
+}
+
+// buildJSONArrayLike builds a LIKE expression for matching within a JSON array.
+// Returns the LIKE clause without NULL/empty checks.
+func (r *renderer) buildJSONArrayLike(arrayExpr, pattern string) string {
+	switch r.dialect {
+	case DialectSQLite, DialectMySQL:
+		return fmt.Sprintf("%s LIKE %s", arrayExpr, r.addArg(pattern))
+	case DialectPostgres:
+		return fmt.Sprintf("(%s)::text LIKE %s", arrayExpr, r.addArg(pattern))
+	default:
+		return ""
+	}
+}
+
+// wrapWithNullCheck wraps a condition with NULL and empty array checks.
+// This ensures we don't match against NULL or empty JSON arrays.
+func (r *renderer) wrapWithNullCheck(arrayExpr, condition string) string {
+	var nullCheck string
+	switch r.dialect {
+	case DialectSQLite:
+		nullCheck = fmt.Sprintf("%s IS NOT NULL AND %s != '[]'", arrayExpr, arrayExpr)
+	case DialectMySQL:
+		nullCheck = fmt.Sprintf("%s IS NOT NULL AND JSON_LENGTH(%s) > 0", arrayExpr, arrayExpr)
+	case DialectPostgres:
+		nullCheck = fmt.Sprintf("%s IS NOT NULL AND jsonb_array_length(%s) > 0", arrayExpr, arrayExpr)
+	default:
+		return condition
+	}
+	return fmt.Sprintf("(%s AND %s)", condition, nullCheck)
+}
+
+func (r *renderer) jsonBoolPredicate(field Field) (string, error) {
+	expr := jsonExtractExpr(r.dialect, field)
+	switch r.dialect {
+	case DialectSQLite:
+		return fmt.Sprintf("%s IS TRUE", expr), nil
+	case DialectMySQL:
+		return fmt.Sprintf("COALESCE(%s, CAST('false' AS JSON)) = CAST('true' AS JSON)", expr), nil
+	case DialectPostgres:
+		return fmt.Sprintf("(%s)::boolean IS TRUE", expr), nil
+	default:
+		return "", errors.Errorf("unsupported dialect %s", r.dialect)
+	}
+}
+
+func combineAnd(left, right renderResult) renderResult {
+	if left.unsatisfiable || right.unsatisfiable {
+		return renderResult{sql: "1 = 0", unsatisfiable: true}
+	}
+	if left.trivial {
+		return right
+	}
+	if right.trivial {
+		return left
+	}
+	return renderResult{
+		sql: fmt.Sprintf("(%s AND %s)", left.sql, right.sql),
+	}
+}
+
+func combineOr(left, right renderResult) renderResult {
+	if left.trivial || right.trivial {
+		return renderResult{trivial: true}
+	}
+	if left.unsatisfiable {
+		return right
+	}
+	if right.unsatisfiable {
+		return left
+	}
+	return renderResult{
+		sql: fmt.Sprintf("(%s OR %s)", left.sql, right.sql),
+	}
+}
+
+func (r *renderer) addArg(value any) string {
+	r.placeholderCounter++
+	r.args = append(r.args, value)
+	if r.dialect == DialectPostgres {
+		return fmt.Sprintf("$%d", r.placeholderOffset+r.placeholderCounter)
+	}
+	return "?"
+}
+
+func (r *renderer) addBoolArg(value bool) string {
+	var v any
+	switch r.dialect {
+	case DialectSQLite:
+		if value {
+			v = 1
+		} else {
+			v = 0
+		}
+	default:
+		v = value
+	}
+	return r.addArg(v)
+}
+
+func expectLiteral(expr ValueExpr) (any, error) {
+	lit, ok := expr.(*LiteralValue)
+	if !ok {
+		return nil, errors.New("expression must be a literal")
+	}
+	return lit.Value, nil
+}
+
+func expectBool(expr ValueExpr) (bool, error) {
+	lit, err := expectLiteral(expr)
+	if err != nil {
+		return false, err
+	}
+	value, ok := lit.(bool)
+	if !ok {
+		return false, errors.New("boolean literal required")
+	}
+	return value, nil
+}
+
+func expectNumericLiteral(expr ValueExpr) (int64, error) {
+	lit, err := expectLiteral(expr)
+	if err != nil {
+		return 0, err
+	}
+	return toInt64(lit)
+}
+
+func toInt64(value any) (int64, error) {
+	switch v := value.(type) {
+	case int:
+		return int64(v), nil
+	case int32:
+		return int64(v), nil
+	case int64:
+		return v, nil
+	case uint32:
+		return int64(v), nil
+	case uint64:
+		return int64(v), nil
+	case float32:
+		return int64(v), nil
+	case float64:
+		return int64(v), nil
+	default:
+		return 0, errors.Errorf("cannot convert %T to int64", value)
+	}
+}
+
+func sqlOperator(op ComparisonOperator) string {
+	return string(op)
+}
+
+func qualifyColumn(d DialectName, col Column) string {
+	switch d {
+	case DialectPostgres:
+		return fmt.Sprintf("%s.%s", col.Table, col.Name)
+	default:
+		return fmt.Sprintf("`%s`.`%s`", col.Table, col.Name)
+	}
+}
+
+func jsonPath(field Field) string {
+	return "$." + strings.Join(field.JSONPath, ".")
+}
+
+func jsonExtractExpr(d DialectName, field Field) string {
+	column := qualifyColumn(d, field.Column)
+	switch d {
+	case DialectSQLite, DialectMySQL:
+		return fmt.Sprintf("JSON_EXTRACT(%s, '%s')", column, jsonPath(field))
+	case DialectPostgres:
+		return buildPostgresJSONAccessor(column, field.JSONPath, true)
+	default:
+		return ""
+	}
+}
+
+func jsonArrayExpr(d DialectName, field Field) string {
+	column := qualifyColumn(d, field.Column)
+	switch d {
+	case DialectSQLite, DialectMySQL:
+		return fmt.Sprintf("JSON_EXTRACT(%s, '%s')", column, jsonPath(field))
+	case DialectPostgres:
+		return buildPostgresJSONAccessor(column, field.JSONPath, false)
+	default:
+		return ""
+	}
+}
+
+func jsonArrayLengthExpr(d DialectName, field Field) string {
+	arrayExpr := jsonArrayExpr(d, field)
+	switch d {
+	case DialectSQLite:
+		return fmt.Sprintf("JSON_ARRAY_LENGTH(COALESCE(%s, JSON_ARRAY()))", arrayExpr)
+	case DialectMySQL:
+		return fmt.Sprintf("JSON_LENGTH(COALESCE(%s, JSON_ARRAY()))", arrayExpr)
+	case DialectPostgres:
+		return fmt.Sprintf("jsonb_array_length(COALESCE(%s, '[]'::jsonb))", arrayExpr)
+	default:
+		return ""
+	}
+}
+
+func buildPostgresJSONAccessor(base string, path []string, terminalText bool) string {
+	expr := base
+	for idx, part := range path {
+		if idx == len(path)-1 && terminalText {
+			expr = fmt.Sprintf("%s->>'%s'", expr, part)
+		} else {
+			expr = fmt.Sprintf("%s->'%s'", expr, part)
+		}
+	}
+	return expr
+}

plugin/filter/schema.go

@@ -0,0 +1,319 @@
+package filter
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/google/cel-go/cel"
+	"github.com/google/cel-go/common/types"
+	"github.com/google/cel-go/common/types/ref"
+)
+
+// DialectName enumerates supported SQL dialects.
+type DialectName string
+
+const (
+	DialectSQLite   DialectName = "sqlite"
+	DialectMySQL    DialectName = "mysql"
+	DialectPostgres DialectName = "postgres"
+)
+
+// FieldType represents the logical type of a field.
+type FieldType string
+
+const (
+	FieldTypeString    FieldType = "string"
+	FieldTypeInt       FieldType = "int"
+	FieldTypeBool      FieldType = "bool"
+	FieldTypeTimestamp FieldType = "timestamp"
+)
+
+// FieldKind describes how a field is stored.
+type FieldKind string
+
+const (
+	FieldKindScalar       FieldKind = "scalar"
+	FieldKindBoolColumn   FieldKind = "bool_column"
+	FieldKindJSONBool     FieldKind = "json_bool"
+	FieldKindJSONList     FieldKind = "json_list"
+	FieldKindVirtualAlias FieldKind = "virtual_alias"
+)
+
+// Column identifies the backing table column.
+type Column struct {
+	Table string
+	Name  string
+}
+
+// Field captures the schema metadata for an exposed CEL identifier.
+type Field struct {
+	Name                 string
+	Kind                 FieldKind
+	Type                 FieldType
+	Column               Column
+	JSONPath             []string
+	AliasFor             string
+	SupportsContains     bool
+	Expressions          map[DialectName]string
+	AllowedComparisonOps map[ComparisonOperator]bool
+}
+
+// Schema collects CEL environment options and field metadata.
+type Schema struct {
+	Name       string
+	Fields     map[string]Field
+	EnvOptions []cel.EnvOption
+}
+
+// Field returns the field metadata if present.
+func (s Schema) Field(name string) (Field, bool) {
+	f, ok := s.Fields[name]
+	return f, ok
+}
+
+// ResolveAlias resolves a virtual alias to its target field.
+func (s Schema) ResolveAlias(name string) (Field, bool) {
+	field, ok := s.Fields[name]
+	if !ok {
+		return Field{}, false
+	}
+	if field.Kind == FieldKindVirtualAlias {
+		target, ok := s.Fields[field.AliasFor]
+		if !ok {
+			return Field{}, false
+		}
+		return target, true
+	}
+	return field, true
+}
+
+var nowFunction = cel.Function("now",
+	cel.Overload("now",
+		[]*cel.Type{},
+		cel.IntType,
+		cel.FunctionBinding(func(_ ...ref.Val) ref.Val {
+			return types.Int(time.Now().Unix())
+		}),
+	),
+)
+
+// NewSchema constructs the memo filter schema and CEL environment.
+func NewSchema() Schema {
+	fields := map[string]Field{
+		"content": {
+			Name:             "content",
+			Kind:             FieldKindScalar,
+			Type:             FieldTypeString,
+			Column:           Column{Table: "memo", Name: "content"},
+			SupportsContains: true,
+			Expressions:      map[DialectName]string{},
+		},
+		"creator_id": {
+			Name:        "creator_id",
+			Kind:        FieldKindScalar,
+			Type:        FieldTypeInt,
+			Column:      Column{Table: "memo", Name: "creator_id"},
+			Expressions: map[DialectName]string{},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+		"created_ts": {
+			Name:   "created_ts",
+			Kind:   FieldKindScalar,
+			Type:   FieldTypeTimestamp,
+			Column: Column{Table: "memo", Name: "created_ts"},
+			Expressions: map[DialectName]string{
+				// MySQL stores created_ts as TIMESTAMP, needs conversion to epoch
+				DialectMySQL: "UNIX_TIMESTAMP(%s)",
+				// PostgreSQL and SQLite store created_ts as BIGINT (epoch), no conversion needed
+				DialectPostgres: "%s",
+				DialectSQLite:   "%s",
+			},
+		},
+		"updated_ts": {
+			Name:   "updated_ts",
+			Kind:   FieldKindScalar,
+			Type:   FieldTypeTimestamp,
+			Column: Column{Table: "memo", Name: "updated_ts"},
+			Expressions: map[DialectName]string{
+				// MySQL stores updated_ts as TIMESTAMP, needs conversion to epoch
+				DialectMySQL: "UNIX_TIMESTAMP(%s)",
+				// PostgreSQL and SQLite store updated_ts as BIGINT (epoch), no conversion needed
+				DialectPostgres: "%s",
+				DialectSQLite:   "%s",
+			},
+		},
+		"pinned": {
+			Name:        "pinned",
+			Kind:        FieldKindBoolColumn,
+			Type:        FieldTypeBool,
+			Column:      Column{Table: "memo", Name: "pinned"},
+			Expressions: map[DialectName]string{},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+		"visibility": {
+			Name:        "visibility",
+			Kind:        FieldKindScalar,
+			Type:        FieldTypeString,
+			Column:      Column{Table: "memo", Name: "visibility"},
+			Expressions: map[DialectName]string{},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+		"tags": {
+			Name:     "tags",
+			Kind:     FieldKindJSONList,
+			Type:     FieldTypeString,
+			Column:   Column{Table: "memo", Name: "payload"},
+			JSONPath: []string{"tags"},
+		},
+		"tag": {
+			Name:     "tag",
+			Kind:     FieldKindVirtualAlias,
+			Type:     FieldTypeString,
+			AliasFor: "tags",
+		},
+		"has_task_list": {
+			Name:     "has_task_list",
+			Kind:     FieldKindJSONBool,
+			Type:     FieldTypeBool,
+			Column:   Column{Table: "memo", Name: "payload"},
+			JSONPath: []string{"property", "hasTaskList"},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+		"has_link": {
+			Name:     "has_link",
+			Kind:     FieldKindJSONBool,
+			Type:     FieldTypeBool,
+			Column:   Column{Table: "memo", Name: "payload"},
+			JSONPath: []string{"property", "hasLink"},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+		"has_code": {
+			Name:     "has_code",
+			Kind:     FieldKindJSONBool,
+			Type:     FieldTypeBool,
+			Column:   Column{Table: "memo", Name: "payload"},
+			JSONPath: []string{"property", "hasCode"},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+		"has_incomplete_tasks": {
+			Name:     "has_incomplete_tasks",
+			Kind:     FieldKindJSONBool,
+			Type:     FieldTypeBool,
+			Column:   Column{Table: "memo", Name: "payload"},
+			JSONPath: []string{"property", "hasIncompleteTasks"},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+	}
+
+	envOptions := []cel.EnvOption{
+		cel.Variable("content", cel.StringType),
+		cel.Variable("creator_id", cel.IntType),
+		cel.Variable("created_ts", cel.IntType),
+		cel.Variable("updated_ts", cel.IntType),
+		cel.Variable("pinned", cel.BoolType),
+		cel.Variable("tag", cel.StringType),
+		cel.Variable("tags", cel.ListType(cel.StringType)),
+		cel.Variable("visibility", cel.StringType),
+		cel.Variable("has_task_list", cel.BoolType),
+		cel.Variable("has_link", cel.BoolType),
+		cel.Variable("has_code", cel.BoolType),
+		cel.Variable("has_incomplete_tasks", cel.BoolType),
+		nowFunction,
+	}
+
+	return Schema{
+		Name:       "memo",
+		Fields:     fields,
+		EnvOptions: envOptions,
+	}
+}
+
+// NewAttachmentSchema constructs the attachment filter schema and CEL environment.
+func NewAttachmentSchema() Schema {
+	fields := map[string]Field{
+		"filename": {
+			Name:             "filename",
+			Kind:             FieldKindScalar,
+			Type:             FieldTypeString,
+			Column:           Column{Table: "attachment", Name: "filename"},
+			SupportsContains: true,
+			Expressions:      map[DialectName]string{},
+		},
+		"mime_type": {
+			Name:        "mime_type",
+			Kind:        FieldKindScalar,
+			Type:        FieldTypeString,
+			Column:      Column{Table: "attachment", Name: "type"},
+			Expressions: map[DialectName]string{},
+		},
+		"create_time": {
+			Name:   "create_time",
+			Kind:   FieldKindScalar,
+			Type:   FieldTypeTimestamp,
+			Column: Column{Table: "attachment", Name: "created_ts"},
+			Expressions: map[DialectName]string{
+				// MySQL stores created_ts as TIMESTAMP, needs conversion to epoch
+				DialectMySQL: "UNIX_TIMESTAMP(%s)",
+				// PostgreSQL and SQLite store created_ts as BIGINT (epoch), no conversion needed
+				DialectPostgres: "%s",
+				DialectSQLite:   "%s",
+			},
+		},
+		"memo_id": {
+			Name:        "memo_id",
+			Kind:        FieldKindScalar,
+			Type:        FieldTypeInt,
+			Column:      Column{Table: "attachment", Name: "memo_id"},
+			Expressions: map[DialectName]string{},
+			AllowedComparisonOps: map[ComparisonOperator]bool{
+				CompareEq:  true,
+				CompareNeq: true,
+			},
+		},
+	}
+
+	envOptions := []cel.EnvOption{
+		cel.Variable("filename", cel.StringType),
+		cel.Variable("mime_type", cel.StringType),
+		cel.Variable("create_time", cel.IntType),
+		cel.Variable("memo_id", cel.AnyType),
+		nowFunction,
+	}
+
+	return Schema{
+		Name:       "attachment",
+		Fields:     fields,
+		EnvOptions: envOptions,
+	}
+}
+
+// columnExpr returns the field expression for the given dialect, applying
+// any schema-specific overrides (e.g. UNIX timestamp conversions).
+func (f Field) columnExpr(d DialectName) string {
+	base := qualifyColumn(d, f.Column)
+	if expr, ok := f.Expressions[d]; ok && expr != "" {
+		return fmt.Sprintf(expr, base)
+	}
+	return base
+}

plugin/httpgetter/html_meta.go

@@ -0,0 +1,166 @@
+package httpgetter
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+
+	"github.com/pkg/errors"
+	"golang.org/x/net/html"
+	"golang.org/x/net/html/atom"
+)
+
+var ErrInternalIP = errors.New("internal IP addresses are not allowed")
+
+var httpClient = &http.Client{
+	CheckRedirect: func(req *http.Request, via []*http.Request) error {
+		if err := validateURL(req.URL.String()); err != nil {
+			return errors.Wrap(err, "redirect to internal IP")
+		}
+		if len(via) >= 10 {
+			return errors.New("too many redirects")
+		}
+		return nil
+	},
+}
+
+type HTMLMeta struct {
+	Title       string `json:"title"`
+	Description string `json:"description"`
+	Image       string `json:"image"`
+}
+
+func GetHTMLMeta(urlStr string) (*HTMLMeta, error) {
+	if err := validateURL(urlStr); err != nil {
+		return nil, err
+	}
+
+	response, err := httpClient.Get(urlStr)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	mediatype, err := getMediatype(response)
+	if err != nil {
+		return nil, err
+	}
+	if mediatype != "text/html" {
+		return nil, errors.New("not a HTML page")
+	}
+
+	// TODO: limit the size of the response body
+
+	htmlMeta := extractHTMLMeta(response.Body)
+	enrichSiteMeta(response.Request.URL, htmlMeta)
+	return htmlMeta, nil
+}
+
+func extractHTMLMeta(resp io.Reader) *HTMLMeta {
+	tokenizer := html.NewTokenizer(resp)
+	htmlMeta := new(HTMLMeta)
+
+	for {
+		tokenType := tokenizer.Next()
+		if tokenType == html.ErrorToken {
+			break
+		} else if tokenType == html.StartTagToken || tokenType == html.SelfClosingTagToken {
+			token := tokenizer.Token()
+			if token.DataAtom == atom.Body {
+				break
+			}
+
+			if token.DataAtom == atom.Title {
+				tokenizer.Next()
+				token := tokenizer.Token()
+				htmlMeta.Title = token.Data
+			} else if token.DataAtom == atom.Meta {
+				description, ok := extractMetaProperty(token, "description")
+				if ok {
+					htmlMeta.Description = description
+				}
+
+				ogTitle, ok := extractMetaProperty(token, "og:title")
+				if ok {
+					htmlMeta.Title = ogTitle
+				}
+
+				ogDescription, ok := extractMetaProperty(token, "og:description")
+				if ok {
+					htmlMeta.Description = ogDescription
+				}
+
+				ogImage, ok := extractMetaProperty(token, "og:image")
+				if ok {
+					htmlMeta.Image = ogImage
+				}
+			}
+		}
+	}
+
+	return htmlMeta
+}
+
+func extractMetaProperty(token html.Token, prop string) (content string, ok bool) {
+	content, ok = "", false
+	for _, attr := range token.Attr {
+		if attr.Key == "property" && attr.Val == prop {
+			ok = true
+		}
+		if attr.Key == "content" {
+			content = attr.Val
+		}
+	}
+	return content, ok
+}
+
+func validateURL(urlStr string) error {
+	u, err := url.Parse(urlStr)
+	if err != nil {
+		return errors.New("invalid URL format")
+	}
+
+	if u.Scheme != "http" && u.Scheme != "https" {
+		return errors.New("only http/https protocols are allowed")
+	}
+
+	host := u.Hostname()
+	if host == "" {
+		return errors.New("empty hostname")
+	}
+
+	// check if the hostname is an IP
+	if ip := net.ParseIP(host); ip != nil {
+		if ip.IsLoopback() || ip.IsPrivate() || ip.IsLinkLocalUnicast() {
+			return errors.Wrap(ErrInternalIP, ip.String())
+		}
+		return nil
+	}
+
+	// check if it's a hostname, resolve it and check all returned IPs
+	ips, err := net.LookupIP(host)
+	if err != nil {
+		return errors.Errorf("failed to resolve hostname: %v", err)
+	}
+
+	for _, ip := range ips {
+		if ip.IsLoopback() || ip.IsPrivate() || ip.IsLinkLocalUnicast() {
+			return errors.Wrapf(ErrInternalIP, "host=%s, ip=%s", host, ip.String())
+		}
+	}
+
+	return nil
+}
+
+func enrichSiteMeta(url *url.URL, meta *HTMLMeta) {
+	if url.Hostname() == "www.youtube.com" {
+		if url.Path == "/watch" {
+			vid := url.Query().Get("v")
+			if vid != "" {
+				meta.Image = fmt.Sprintf("https://img.youtube.com/vi/%s/mqdefault.jpg", vid)
+			}
+		}
+	}
+}

plugin/httpgetter/html_meta_test.go

@@ -0,0 +1,32 @@
+package httpgetter
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetHTMLMeta(t *testing.T) {
+	tests := []struct {
+		urlStr   string
+		htmlMeta HTMLMeta
+	}{}
+	for _, test := range tests {
+		metadata, err := GetHTMLMeta(test.urlStr)
+		require.NoError(t, err)
+		require.Equal(t, test.htmlMeta, *metadata)
+	}
+}
+
+func TestGetHTMLMetaForInternal(t *testing.T) {
+	// test for internal IP
+	if _, err := GetHTMLMeta("http://192.168.0.1"); !errors.Is(err, ErrInternalIP) {
+		t.Errorf("Expected error for internal IP, got %v", err)
+	}
+
+	// test for resolved internal IP
+	if _, err := GetHTMLMeta("http://localhost"); !errors.Is(err, ErrInternalIP) {
+		t.Errorf("Expected error for resolved internal IP, got %v", err)
+	}
+}

plugin/httpgetter/http_getter.go

@@ -0,0 +1 @@
+package httpgetter

plugin/httpgetter/image.go

@@ -0,0 +1,45 @@
+package httpgetter
+
+import (
+	"errors"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+type Image struct {
+	Blob      []byte
+	Mediatype string
+}
+
+func GetImage(urlStr string) (*Image, error) {
+	if _, err := url.Parse(urlStr); err != nil {
+		return nil, err
+	}
+
+	response, err := http.Get(urlStr)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	mediatype, err := getMediatype(response)
+	if err != nil {
+		return nil, err
+	}
+	if !strings.HasPrefix(mediatype, "image/") {
+		return nil, errors.New("wrong image mediatype")
+	}
+
+	bodyBytes, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	image := &Image{
+		Blob:      bodyBytes,
+		Mediatype: mediatype,
+	}
+	return image, nil
+}

plugin/httpgetter/util.go

@@ -0,0 +1,15 @@
+package httpgetter
+
+import (
+	"mime"
+	"net/http"
+)
+
+func getMediatype(response *http.Response) (string, error) {
+	contentType := response.Header.Get("content-type")
+	mediatype, _, err := mime.ParseMediaType(contentType)
+	if err != nil {
+		return "", err
+	}
+	return mediatype, nil
+}

plugin/idp/idp.go

@@ -0,0 +1,8 @@
+package idp
+
+type IdentityProviderUserInfo struct {
+	Identifier  string
+	DisplayName string
+	Email       string
+	AvatarURL   string
+}

plugin/idp/oauth2/oauth2.go

@@ -0,0 +1,134 @@
+// Package oauth2 is the plugin for OAuth2 Identity Provider.
+package oauth2
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+
+	"github.com/pkg/errors"
+	"golang.org/x/oauth2"
+
+	"github.com/usememos/memos/plugin/idp"
+	storepb "github.com/usememos/memos/proto/gen/store"
+)
+
+// IdentityProvider represents an OAuth2 Identity Provider.
+type IdentityProvider struct {
+	config *storepb.OAuth2Config
+}
+
+// NewIdentityProvider initializes a new OAuth2 Identity Provider with the given configuration.
+func NewIdentityProvider(config *storepb.OAuth2Config) (*IdentityProvider, error) {
+	for v, field := range map[string]string{
+		config.ClientId:                "clientId",
+		config.ClientSecret:            "clientSecret",
+		config.TokenUrl:                "tokenUrl",
+		config.UserInfoUrl:             "userInfoUrl",
+		config.FieldMapping.Identifier: "fieldMapping.identifier",
+	} {
+		if v == "" {
+			return nil, errors.Errorf(`the field "%s" is empty but required`, field)
+		}
+	}
+
+	return &IdentityProvider{
+		config: config,
+	}, nil
+}
+
+// ExchangeToken returns the exchanged OAuth2 token using the given authorization code.
+// If codeVerifier is provided, it will be used for PKCE (Proof Key for Code Exchange) validation.
+func (p *IdentityProvider) ExchangeToken(ctx context.Context, redirectURL, code, codeVerifier string) (string, error) {
+	conf := &oauth2.Config{
+		ClientID:     p.config.ClientId,
+		ClientSecret: p.config.ClientSecret,
+		RedirectURL:  redirectURL,
+		Scopes:       p.config.Scopes,
+		Endpoint: oauth2.Endpoint{
+			AuthURL:   p.config.AuthUrl,
+			TokenURL:  p.config.TokenUrl,
+			AuthStyle: oauth2.AuthStyleInParams,
+		},
+	}
+
+	// Prepare token exchange options
+	opts := []oauth2.AuthCodeOption{}
+
+	// Add PKCE code_verifier if provided
+	if codeVerifier != "" {
+		opts = append(opts, oauth2.SetAuthURLParam("code_verifier", codeVerifier))
+	}
+
+	token, err := conf.Exchange(ctx, code, opts...)
+	if err != nil {
+		return "", errors.Wrap(err, "failed to exchange access token")
+	}
+
+	// Use the standard AccessToken field instead of Extra()
+	// This is more reliable across different OAuth providers
+	if token.AccessToken == "" {
+		return "", errors.New("missing access token from authorization response")
+	}
+
+	return token.AccessToken, nil
+}
+
+// UserInfo returns the parsed user information using the given OAuth2 token.
+func (p *IdentityProvider) UserInfo(token string) (*idp.IdentityProviderUserInfo, error) {
+	client := &http.Client{}
+	req, err := http.NewRequest(http.MethodGet, p.config.UserInfoUrl, nil)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to new http request")
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get user information")
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to read response body")
+	}
+
+	var claims map[string]any
+	if err := json.Unmarshal(body, &claims); err != nil {
+		return nil, errors.Wrap(err, "failed to unmarshal response body")
+	}
+	slog.Info("user info claims", "claims", claims)
+	userInfo := &idp.IdentityProviderUserInfo{}
+	if v, ok := claims[p.config.FieldMapping.Identifier].(string); ok {
+		userInfo.Identifier = v
+	}
+	if userInfo.Identifier == "" {
+		return nil, errors.Errorf("the field %q is not found in claims or has empty value", p.config.FieldMapping.Identifier)
+	}
+
+	// Best effort to map optional fields
+	if p.config.FieldMapping.DisplayName != "" {
+		if v, ok := claims[p.config.FieldMapping.DisplayName].(string); ok {
+			userInfo.DisplayName = v
+		}
+	}
+	if userInfo.DisplayName == "" {
+		userInfo.DisplayName = userInfo.Identifier
+	}
+	if p.config.FieldMapping.Email != "" {
+		if v, ok := claims[p.config.FieldMapping.Email].(string); ok {
+			userInfo.Email = v
+		}
+	}
+	if p.config.FieldMapping.AvatarUrl != "" {
+		if v, ok := claims[p.config.FieldMapping.AvatarUrl].(string); ok {
+			userInfo.AvatarURL = v
+		}
+	}
+	slog.Info("user info", "userInfo", userInfo)
+	return userInfo, nil
+}

plugin/idp/oauth2/oauth2_test.go

@@ -0,0 +1,164 @@
+package oauth2
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/usememos/memos/plugin/idp"
+	storepb "github.com/usememos/memos/proto/gen/store"
+)
+
+func TestNewIdentityProvider(t *testing.T) {
+	tests := []struct {
+		name        string
+		config      *storepb.OAuth2Config
+		containsErr string
+	}{
+		{
+			name: "no tokenUrl",
+			config: &storepb.OAuth2Config{
+				ClientId:     "test-client-id",
+				ClientSecret: "test-client-secret",
+				AuthUrl:      "",
+				TokenUrl:     "",
+				UserInfoUrl:  "https://example.com/api/user",
+				FieldMapping: &storepb.FieldMapping{
+					Identifier: "login",
+				},
+			},
+			containsErr: `the field "tokenUrl" is empty but required`,
+		},
+		{
+			name: "no userInfoUrl",
+			config: &storepb.OAuth2Config{
+				ClientId:     "test-client-id",
+				ClientSecret: "test-client-secret",
+				AuthUrl:      "",
+				TokenUrl:     "https://example.com/token",
+				UserInfoUrl:  "",
+				FieldMapping: &storepb.FieldMapping{
+					Identifier: "login",
+				},
+			},
+			containsErr: `the field "userInfoUrl" is empty but required`,
+		},
+		{
+			name: "no field mapping identifier",
+			config: &storepb.OAuth2Config{
+				ClientId:     "test-client-id",
+				ClientSecret: "test-client-secret",
+				AuthUrl:      "",
+				TokenUrl:     "https://example.com/token",
+				UserInfoUrl:  "https://example.com/api/user",
+				FieldMapping: &storepb.FieldMapping{
+					Identifier: "",
+				},
+			},
+			containsErr: `the field "fieldMapping.identifier" is empty but required`,
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(*testing.T) {
+			_, err := NewIdentityProvider(test.config)
+			assert.ErrorContains(t, err, test.containsErr)
+		})
+	}
+}
+
+func newMockServer(t *testing.T, code, accessToken string, userinfo []byte) *httptest.Server {
+	mux := http.NewServeMux()
+
+	var rawIDToken string
+	mux.HandleFunc("/oauth2/token", func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+
+		body, err := io.ReadAll(r.Body)
+		require.NoError(t, err)
+		vals, err := url.ParseQuery(string(body))
+		require.NoError(t, err)
+
+		require.Equal(t, code, vals.Get("code"))
+		require.Equal(t, "authorization_code", vals.Get("grant_type"))
+
+		w.Header().Set("Content-Type", "application/json")
+		err = json.NewEncoder(w).Encode(map[string]any{
+			"access_token": accessToken,
+			"token_type":   "Bearer",
+			"expires_in":   3600,
+			"id_token":     rawIDToken,
+		})
+		require.NoError(t, err)
+	})
+	mux.HandleFunc("/oauth2/userinfo", func(w http.ResponseWriter, _ *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, err := w.Write(userinfo)
+		require.NoError(t, err)
+	})
+
+	s := httptest.NewServer(mux)
+
+	return s
+}
+
+func TestIdentityProvider(t *testing.T) {
+	ctx := context.Background()
+
+	const (
+		testClientID    = "test-client-id"
+		testCode        = "test-code"
+		testAccessToken = "test-access-token"
+		testSubject     = "123456789"
+		testName        = "John Doe"
+		testEmail       = "john.doe@example.com"
+	)
+	userInfo, err := json.Marshal(
+		map[string]any{
+			"sub":   testSubject,
+			"name":  testName,
+			"email": testEmail,
+		},
+	)
+	require.NoError(t, err)
+
+	s := newMockServer(t, testCode, testAccessToken, userInfo)
+
+	oauth2, err := NewIdentityProvider(
+		&storepb.OAuth2Config{
+			ClientId:     testClientID,
+			ClientSecret: "test-client-secret",
+			TokenUrl:     fmt.Sprintf("%s/oauth2/token", s.URL),
+			UserInfoUrl:  fmt.Sprintf("%s/oauth2/userinfo", s.URL),
+			FieldMapping: &storepb.FieldMapping{
+				Identifier:  "sub",
+				DisplayName: "name",
+				Email:       "email",
+			},
+		},
+	)
+	require.NoError(t, err)
+
+	redirectURL := "https://example.com/oauth/callback"
+	// Test without PKCE (backward compatibility)
+	oauthToken, err := oauth2.ExchangeToken(ctx, redirectURL, testCode, "")
+	require.NoError(t, err)
+	require.Equal(t, testAccessToken, oauthToken)
+
+	userInfoResult, err := oauth2.UserInfo(oauthToken)
+	require.NoError(t, err)
+
+	wantUserInfo := &idp.IdentityProviderUserInfo{
+		Identifier:  testSubject,
+		DisplayName: testName,
+		Email:       testEmail,
+	}
+	assert.Equal(t, wantUserInfo, userInfoResult)
+}

plugin/markdown/ast/tag.go

@@ -0,0 +1,28 @@
+package ast
+
+import (
+	gast "github.com/yuin/goldmark/ast"
+)
+
+// TagNode represents a #tag in the markdown AST.
+type TagNode struct {
+	gast.BaseInline
+
+	// Tag name without the # prefix
+	Tag []byte
+}
+
+// KindTag is the NodeKind for TagNode.
+var KindTag = gast.NewNodeKind("Tag")
+
+// Kind returns KindTag.
+func (*TagNode) Kind() gast.NodeKind {
+	return KindTag
+}
+
+// Dump implements Node.Dump for debugging.
+func (n *TagNode) Dump(source []byte, level int) {
+	gast.DumpHelper(n, source, level, map[string]string{
+		"Tag": string(n.Tag),
+	}, nil)
+}

plugin/markdown/extensions/tag.go

@@ -0,0 +1,24 @@
+package extensions
+
+import (
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/util"
+
+	mparser "github.com/usememos/memos/plugin/markdown/parser"
+)
+
+type tagExtension struct{}
+
+// TagExtension is a goldmark extension for #tag syntax.
+var TagExtension = &tagExtension{}
+
+// Extend extends the goldmark parser with tag support.
+func (*tagExtension) Extend(m goldmark.Markdown) {
+	m.Parser().AddOptions(
+		parser.WithInlineParsers(
+			// Priority 200 - run before standard link parser (500)
+			util.Prioritized(mparser.NewTagParser(), 200),
+		),
+	)
+}

plugin/markdown/markdown.go

@@ -0,0 +1,409 @@
+package markdown
+
+import (
+	"bytes"
+	"strings"
+
+	"github.com/yuin/goldmark"
+	gast "github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/extension"
+	east "github.com/yuin/goldmark/extension/ast"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+
+	mast "github.com/usememos/memos/plugin/markdown/ast"
+	"github.com/usememos/memos/plugin/markdown/extensions"
+	"github.com/usememos/memos/plugin/markdown/renderer"
+	storepb "github.com/usememos/memos/proto/gen/store"
+)
+
+// ExtractedData contains all metadata extracted from markdown in a single pass.
+type ExtractedData struct {
+	Tags     []string
+	Property *storepb.MemoPayload_Property
+}
+
+// Service handles markdown metadata extraction.
+// It uses goldmark to parse markdown and extract tags, properties, and snippets.
+// HTML rendering is primarily done on frontend using markdown-it, but backend provides
+// RenderHTML for RSS feeds and other server-side rendering needs.
+type Service interface {
+	// ExtractAll extracts tags, properties, and references in a single parse (most efficient)
+	ExtractAll(content []byte) (*ExtractedData, error)
+
+	// ExtractTags returns all #tags found in content
+	ExtractTags(content []byte) ([]string, error)
+
+	// ExtractProperties computes boolean properties
+	ExtractProperties(content []byte) (*storepb.MemoPayload_Property, error)
+
+	// RenderMarkdown renders goldmark AST back to markdown text
+	RenderMarkdown(content []byte) (string, error)
+
+	// RenderHTML renders markdown content to HTML
+	RenderHTML(content []byte) (string, error)
+
+	// GenerateSnippet creates plain text summary
+	GenerateSnippet(content []byte, maxLength int) (string, error)
+
+	// ValidateContent checks for syntax errors
+	ValidateContent(content []byte) error
+
+	// RenameTag renames all occurrences of oldTag to newTag in content
+	RenameTag(content []byte, oldTag, newTag string) (string, error)
+}
+
+// service implements the Service interface.
+type service struct {
+	md goldmark.Markdown
+}
+
+// Option configures the markdown service.
+type Option func(*config)
+
+type config struct {
+	enableTags bool
+}
+
+// WithTagExtension enables #tag parsing.
+func WithTagExtension() Option {
+	return func(c *config) {
+		c.enableTags = true
+	}
+}
+
+// NewService creates a new markdown service with the given options.
+func NewService(opts ...Option) Service {
+	cfg := &config{}
+	for _, opt := range opts {
+		opt(cfg)
+	}
+
+	exts := []goldmark.Extender{
+		extension.GFM, // GitHub Flavored Markdown (tables, strikethrough, task lists, autolinks)
+	}
+
+	// Add custom extensions based on config
+	if cfg.enableTags {
+		exts = append(exts, extensions.TagExtension)
+	}
+
+	md := goldmark.New(
+		goldmark.WithExtensions(exts...),
+		goldmark.WithParserOptions(
+			parser.WithAutoHeadingID(), // Generate heading IDs
+		),
+	)
+
+	return &service{
+		md: md,
+	}
+}
+
+// parse is an internal helper to parse content into AST.
+func (s *service) parse(content []byte) (gast.Node, error) {
+	reader := text.NewReader(content)
+	doc := s.md.Parser().Parse(reader)
+	return doc, nil
+}
+
+// ExtractTags returns all #tags found in content.
+func (s *service) ExtractTags(content []byte) ([]string, error) {
+	root, err := s.parse(content)
+	if err != nil {
+		return nil, err
+	}
+
+	var tags []string
+
+	// Walk the AST to find tag nodes
+	err = gast.Walk(root, func(n gast.Node, entering bool) (gast.WalkStatus, error) {
+		if !entering {
+			return gast.WalkContinue, nil
+		}
+
+		// Check for custom TagNode
+		if tagNode, ok := n.(*mast.TagNode); ok {
+			tags = append(tags, string(tagNode.Tag))
+		}
+
+		return gast.WalkContinue, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Deduplicate tags while preserving original case
+	return uniquePreserveCase(tags), nil
+}
+
+// ExtractProperties computes boolean properties about the content.
+func (s *service) ExtractProperties(content []byte) (*storepb.MemoPayload_Property, error) {
+	root, err := s.parse(content)
+	if err != nil {
+		return nil, err
+	}
+
+	prop := &storepb.MemoPayload_Property{}
+
+	err = gast.Walk(root, func(n gast.Node, entering bool) (gast.WalkStatus, error) {
+		if !entering {
+			return gast.WalkContinue, nil
+		}
+
+		switch n.Kind() {
+		case gast.KindLink:
+			prop.HasLink = true
+
+		case gast.KindCodeBlock, gast.KindFencedCodeBlock, gast.KindCodeSpan:
+			prop.HasCode = true
+
+		case east.KindTaskCheckBox:
+			prop.HasTaskList = true
+			if checkBox, ok := n.(*east.TaskCheckBox); ok {
+				if !checkBox.IsChecked {
+					prop.HasIncompleteTasks = true
+				}
+			}
+		default:
+			// No special handling for other node types
+		}
+
+		return gast.WalkContinue, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	return prop, nil
+}
+
+// RenderMarkdown renders goldmark AST back to markdown text.
+func (s *service) RenderMarkdown(content []byte) (string, error) {
+	root, err := s.parse(content)
+	if err != nil {
+		return "", err
+	}
+
+	mdRenderer := renderer.NewMarkdownRenderer()
+	return mdRenderer.Render(root, content), nil
+}
+
+// RenderHTML renders markdown content to HTML using goldmark's built-in HTML renderer.
+func (s *service) RenderHTML(content []byte) (string, error) {
+	var buf bytes.Buffer
+	if err := s.md.Convert(content, &buf); err != nil {
+		return "", err
+	}
+	return buf.String(), nil
+}
+
+// GenerateSnippet creates a plain text summary from markdown content.
+func (s *service) GenerateSnippet(content []byte, maxLength int) (string, error) {
+	root, err := s.parse(content)
+	if err != nil {
+		return "", err
+	}
+
+	var buf strings.Builder
+	var lastNodeWasBlock bool
+
+	err = gast.Walk(root, func(n gast.Node, entering bool) (gast.WalkStatus, error) {
+		if entering {
+			// Skip code blocks and code spans entirely
+			switch n.Kind() {
+			case gast.KindCodeBlock, gast.KindFencedCodeBlock, gast.KindCodeSpan:
+				return gast.WalkSkipChildren, nil
+			default:
+				// Continue walking for other node types
+			}
+
+			// Add space before block elements (except first)
+			switch n.Kind() {
+			case gast.KindParagraph, gast.KindHeading, gast.KindListItem:
+				if buf.Len() > 0 && lastNodeWasBlock {
+					buf.WriteByte(' ')
+				}
+			default:
+				// No space needed for other node types
+			}
+		}
+
+		if !entering {
+			// Mark that we just exited a block element
+			switch n.Kind() {
+			case gast.KindParagraph, gast.KindHeading, gast.KindListItem:
+				lastNodeWasBlock = true
+			default:
+				// Not a block element
+			}
+			return gast.WalkContinue, nil
+		}
+
+		lastNodeWasBlock = false
+
+		// Only extract plain text nodes
+		if textNode, ok := n.(*gast.Text); ok {
+			segment := textNode.Segment
+			buf.Write(segment.Value(content))
+
+			// Add space if this is a soft line break
+			if textNode.SoftLineBreak() {
+				buf.WriteByte(' ')
+			}
+		}
+
+		// Stop walking if we've exceeded double the max length
+		// (we'll truncate precisely later)
+		if buf.Len() > maxLength*2 {
+			return gast.WalkStop, nil
+		}
+
+		return gast.WalkContinue, nil
+	})
+
+	if err != nil {
+		return "", err
+	}
+
+	snippet := buf.String()
+
+	// Truncate at word boundary if needed
+	if len(snippet) > maxLength {
+		snippet = truncateAtWord(snippet, maxLength)
+	}
+
+	return strings.TrimSpace(snippet), nil
+}
+
+// ValidateContent checks if the markdown content is valid.
+func (s *service) ValidateContent(content []byte) error {
+	// Try to parse the content
+	_, err := s.parse(content)
+	return err
+}
+
+// ExtractAll extracts tags, properties, and references in a single parse for efficiency.
+func (s *service) ExtractAll(content []byte) (*ExtractedData, error) {
+	root, err := s.parse(content)
+	if err != nil {
+		return nil, err
+	}
+
+	data := &ExtractedData{
+		Tags:     []string{},
+		Property: &storepb.MemoPayload_Property{},
+	}
+
+	// Single walk to collect all data
+	err = gast.Walk(root, func(n gast.Node, entering bool) (gast.WalkStatus, error) {
+		if !entering {
+			return gast.WalkContinue, nil
+		}
+
+		// Extract tags
+		if tagNode, ok := n.(*mast.TagNode); ok {
+			data.Tags = append(data.Tags, string(tagNode.Tag))
+		}
+
+		// Extract properties based on node kind
+		switch n.Kind() {
+		case gast.KindLink:
+			data.Property.HasLink = true
+
+		case gast.KindCodeBlock, gast.KindFencedCodeBlock, gast.KindCodeSpan:
+			data.Property.HasCode = true
+
+		case east.KindTaskCheckBox:
+			data.Property.HasTaskList = true
+			if checkBox, ok := n.(*east.TaskCheckBox); ok {
+				if !checkBox.IsChecked {
+					data.Property.HasIncompleteTasks = true
+				}
+			}
+		default:
+			// No special handling for other node types
+		}
+
+		return gast.WalkContinue, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Deduplicate tags while preserving original case
+	data.Tags = uniquePreserveCase(data.Tags)
+
+	return data, nil
+}
+
+// RenameTag renames all occurrences of oldTag to newTag in content.
+func (s *service) RenameTag(content []byte, oldTag, newTag string) (string, error) {
+	root, err := s.parse(content)
+	if err != nil {
+		return "", err
+	}
+
+	// Walk the AST to find and rename tag nodes
+	err = gast.Walk(root, func(n gast.Node, entering bool) (gast.WalkStatus, error) {
+		if !entering {
+			return gast.WalkContinue, nil
+		}
+
+		// Check for custom TagNode and rename if it matches
+		if tagNode, ok := n.(*mast.TagNode); ok {
+			if string(tagNode.Tag) == oldTag {
+				tagNode.Tag = []byte(newTag)
+			}
+		}
+
+		return gast.WalkContinue, nil
+	})
+
+	if err != nil {
+		return "", err
+	}
+
+	// Render back to markdown using the already-parsed AST
+	mdRenderer := renderer.NewMarkdownRenderer()
+	return mdRenderer.Render(root, content), nil
+}
+
+// uniquePreserveCase returns unique strings from input while preserving case.
+func uniquePreserveCase(strs []string) []string {
+	seen := make(map[string]struct{})
+	var result []string
+
+	for _, s := range strs {
+		if _, exists := seen[s]; !exists {
+			seen[s] = struct{}{}
+			result = append(result, s)
+		}
+	}
+
+	return result
+}
+
+// truncateAtWord truncates a string at the last word boundary before maxLength.
+// maxLength is treated as a rune (character) count to properly handle UTF-8 multi-byte characters.
+func truncateAtWord(s string, maxLength int) string {
+	// Convert to runes to properly handle multi-byte UTF-8 characters
+	runes := []rune(s)
+	if len(runes) <= maxLength {
+		return s
+	}
+
+	// Truncate to max length (by character count, not byte count)
+	truncated := string(runes[:maxLength])
+
+	// Find last space to avoid cutting in the middle of a word
+	lastSpace := strings.LastIndexAny(truncated, " \t\n\r")
+	if lastSpace > 0 {
+		truncated = truncated[:lastSpace]
+	}
+
+	return truncated + " ..."
+}

plugin/markdown/markdown_test.go

@@ -0,0 +1,448 @@
+package markdown
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewService(t *testing.T) {
+	svc := NewService()
+	assert.NotNil(t, svc)
+}
+
+func TestValidateContent(t *testing.T) {
+	svc := NewService()
+
+	tests := []struct {
+		name    string
+		content string
+		wantErr bool
+	}{
+		{
+			name:    "valid markdown",
+			content: "# Hello\n\nThis is **bold** text.",
+			wantErr: false,
+		},
+		{
+			name:    "empty content",
+			content: "",
+			wantErr: false,
+		},
+		{
+			name:    "complex markdown",
+			content: "# Title\n\n- List item 1\n- List item 2\n\n```go\ncode block\n```",
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := svc.ValidateContent([]byte(tt.content))
+			if tt.wantErr {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestGenerateSnippet(t *testing.T) {
+	svc := NewService()
+
+	tests := []struct {
+		name      string
+		content   string
+		maxLength int
+		expected  string
+	}{
+		{
+			name:      "simple text",
+			content:   "Hello world",
+			maxLength: 100,
+			expected:  "Hello world",
+		},
+		{
+			name:      "text with formatting",
+			content:   "This is **bold** and *italic* text.",
+			maxLength: 100,
+			expected:  "This is bold and italic text.",
+		},
+		{
+			name:      "truncate long text",
+			content:   "This is a very long piece of text that should be truncated at a word boundary.",
+			maxLength: 30,
+			expected:  "This is a very long piece of ...",
+		},
+		{
+			name:      "heading and paragraph",
+			content:   "# My Title\n\nThis is the first paragraph.",
+			maxLength: 100,
+			expected:  "My Title This is the first paragraph.",
+		},
+		{
+			name:      "code block removed",
+			content:   "Text before\n\n```go\ncode\n```\n\nText after",
+			maxLength: 100,
+			expected:  "Text before Text after",
+		},
+		{
+			name:      "list items",
+			content:   "- Item 1\n- Item 2\n- Item 3",
+			maxLength: 100,
+			expected:  "Item 1 Item 2 Item 3",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			snippet, err := svc.GenerateSnippet([]byte(tt.content), tt.maxLength)
+			require.NoError(t, err)
+			assert.Equal(t, tt.expected, snippet)
+		})
+	}
+}
+
+func TestExtractProperties(t *testing.T) {
+	tests := []struct {
+		name     string
+		content  string
+		hasLink  bool
+		hasCode  bool
+		hasTasks bool
+		hasInc   bool
+	}{
+		{
+			name:     "plain text",
+			content:  "Just plain text",
+			hasLink:  false,
+			hasCode:  false,
+			hasTasks: false,
+			hasInc:   false,
+		},
+		{
+			name:     "with link",
+			content:  "Check out [this link](https://example.com)",
+			hasLink:  true,
+			hasCode:  false,
+			hasTasks: false,
+			hasInc:   false,
+		},
+		{
+			name:     "with inline code",
+			content:  "Use `console.log()` to debug",
+			hasLink:  false,
+			hasCode:  true,
+			hasTasks: false,
+			hasInc:   false,
+		},
+		{
+			name:     "with code block",
+			content:  "```go\nfunc main() {}\n```",
+			hasLink:  false,
+			hasCode:  true,
+			hasTasks: false,
+			hasInc:   false,
+		},
+		{
+			name:     "with completed task",
+			content:  "- [x] Completed task",
+			hasLink:  false,
+			hasCode:  false,
+			hasTasks: true,
+			hasInc:   false,
+		},
+		{
+			name:     "with incomplete task",
+			content:  "- [ ] Todo item",
+			hasLink:  false,
+			hasCode:  false,
+			hasTasks: true,
+			hasInc:   true,
+		},
+		{
+			name:     "mixed tasks",
+			content:  "- [x] Done\n- [ ] Not done",
+			hasLink:  false,
+			hasCode:  false,
+			hasTasks: true,
+			hasInc:   true,
+		},
+		{
+			name:     "everything",
+			content:  "# Title\n\n[Link](url)\n\n`code`\n\n- [ ] Task",
+			hasLink:  true,
+			hasCode:  true,
+			hasTasks: true,
+			hasInc:   true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			svc := NewService()
+
+			props, err := svc.ExtractProperties([]byte(tt.content))
+			require.NoError(t, err)
+			assert.Equal(t, tt.hasLink, props.HasLink, "HasLink")
+			assert.Equal(t, tt.hasCode, props.HasCode, "HasCode")
+			assert.Equal(t, tt.hasTasks, props.HasTaskList, "HasTaskList")
+			assert.Equal(t, tt.hasInc, props.HasIncompleteTasks, "HasIncompleteTasks")
+		})
+	}
+}
+
+func TestExtractTags(t *testing.T) {
+	tests := []struct {
+		name     string
+		content  string
+		withExt  bool
+		expected []string
+	}{
+		{
+			name:     "no tags",
+			content:  "Just plain text",
+			withExt:  false,
+			expected: []string{},
+		},
+		{
+			name:     "single tag",
+			content:  "Text with #tag",
+			withExt:  true,
+			expected: []string{"tag"},
+		},
+		{
+			name:     "multiple tags",
+			content:  "Text with #tag1 and #tag2",
+			withExt:  true,
+			expected: []string{"tag1", "tag2"},
+		},
+		{
+			name:     "duplicate tags",
+			content:  "#work is important. #Work #WORK",
+			withExt:  true,
+			expected: []string{"work", "Work", "WORK"},
+		},
+		{
+			name:     "tags with hyphens and underscores",
+			content:  "Tags: #work-notes #2024_plans",
+			withExt:  true,
+			expected: []string{"work-notes", "2024_plans"},
+		},
+		{
+			name:     "tags at end of sentence",
+			content:  "This is important #urgent.",
+			withExt:  true,
+			expected: []string{"urgent"},
+		},
+		{
+			name:     "headings not tags",
+			content:  "## Heading\n\n# Title\n\nText with #realtag",
+			withExt:  true,
+			expected: []string{"realtag"},
+		},
+		{
+			name:     "numeric tag",
+			content:  "Issue #123",
+			withExt:  true,
+			expected: []string{"123"},
+		},
+		{
+			name:     "tag in list",
+			content:  "- Item 1 #todo\n- Item 2 #done",
+			withExt:  true,
+			expected: []string{"todo", "done"},
+		},
+		{
+			name:     "no extension enabled",
+			content:  "Text with #tag",
+			withExt:  false,
+			expected: []string{},
+		},
+		{
+			name:     "Chinese tag",
+			content:  "Text with #测试",
+			withExt:  true,
+			expected: []string{"测试"},
+		},
+		{
+			name:     "Chinese tag followed by punctuation",
+			content:  "Text #测试。 More text",
+			withExt:  true,
+			expected: []string{"测试"},
+		},
+		{
+			name:     "mixed Chinese and ASCII tag",
+			content:  "#测试test123 content",
+			withExt:  true,
+			expected: []string{"测试test123"},
+		},
+		{
+			name:     "Japanese tag",
+			content:  "#日本語 content",
+			withExt:  true,
+			expected: []string{"日本語"},
+		},
+		{
+			name:     "Korean tag",
+			content:  "#한국어 content",
+			withExt:  true,
+			expected: []string{"한국어"},
+		},
+		{
+			name:     "hierarchical tag with Chinese",
+			content:  "#work/测试/项目",
+			withExt:  true,
+			expected: []string{"work/测试/项目"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var svc Service
+			if tt.withExt {
+				svc = NewService(WithTagExtension())
+			} else {
+				svc = NewService()
+			}
+
+			tags, err := svc.ExtractTags([]byte(tt.content))
+			require.NoError(t, err)
+			assert.ElementsMatch(t, tt.expected, tags)
+		})
+	}
+}
+
+func TestUniquePreserveCase(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    []string
+		expected []string
+	}{
+		{
+			name:     "empty",
+			input:    []string{},
+			expected: []string{},
+		},
+		{
+			name:     "unique items",
+			input:    []string{"tag1", "tag2", "tag3"},
+			expected: []string{"tag1", "tag2", "tag3"},
+		},
+		{
+			name:     "duplicates",
+			input:    []string{"tag", "TAG", "Tag"},
+			expected: []string{"tag", "TAG", "Tag"},
+		},
+		{
+			name:     "mixed",
+			input:    []string{"Work", "work", "Important", "work"},
+			expected: []string{"Work", "work", "Important"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := uniquePreserveCase(tt.input)
+			assert.ElementsMatch(t, tt.expected, result)
+		})
+	}
+}
+
+func TestTruncateAtWord(t *testing.T) {
+	tests := []struct {
+		name      string
+		input     string
+		maxLength int
+		expected  string
+	}{
+		{
+			name:      "no truncation needed",
+			input:     "short",
+			maxLength: 10,
+			expected:  "short",
+		},
+		{
+			name:      "exact length",
+			input:     "exactly ten",
+			maxLength: 11,
+			expected:  "exactly ten",
+		},
+		{
+			name:      "truncate at word",
+			input:     "this is a long sentence",
+			maxLength: 10,
+			expected:  "this is a ...",
+		},
+		{
+			name:      "truncate very long word",
+			input:     "supercalifragilisticexpialidocious",
+			maxLength: 10,
+			expected:  "supercalif ...",
+		},
+		{
+			name:      "CJK characters without spaces",
+			input:     "这是一个很长的中文句子没有空格的情况下也要正确处理",
+			maxLength: 15,
+			expected:  "这是一个很长的中文句子没有空格 ...",
+		},
+		{
+			name:      "mixed CJK and Latin",
+			input:     "这是中文mixed with English文字",
+			maxLength: 10,
+			expected:  "这是中文mixed ...",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := truncateAtWord(tt.input, tt.maxLength)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+// Benchmark tests.
+func BenchmarkGenerateSnippet(b *testing.B) {
+	svc := NewService()
+	content := []byte(`# Large Document
+
+This is a large document with multiple paragraphs and formatting.
+
+## Section 1
+
+Here is some **bold** text and *italic* text with [links](https://example.com).
+
+- List item 1
+- List item 2
+- List item 3
+
+## Section 2
+
+More content here with ` + "`inline code`" + ` and other elements.
+
+` + "```go\nfunc example() {\n    return true\n}\n```")
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, err := svc.GenerateSnippet(content, 200)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkExtractProperties(b *testing.B) {
+	svc := NewService()
+	content := []byte("# Title\n\n[Link](url)\n\n`code`\n\n- [ ] Task\n- [x] Done")
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, err := svc.ExtractProperties(content)
+		if err != nil {
+			b.Fatal(err)
+		}
+	}
+}

plugin/markdown/parser/tag.go

@@ -0,0 +1,139 @@
+package parser
+
+import (
+	"unicode"
+	"unicode/utf8"
+
+	gast "github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+
+	mast "github.com/usememos/memos/plugin/markdown/ast"
+)
+
+const (
+	// MaxTagLength defines the maximum number of runes allowed in a tag.
+	MaxTagLength = 100
+)
+
+type tagParser struct{}
+
+// NewTagParser creates a new inline parser for #tag syntax.
+func NewTagParser() parser.InlineParser {
+	return &tagParser{}
+}
+
+// Trigger returns the characters that trigger this parser.
+func (*tagParser) Trigger() []byte {
+	return []byte{'#'}
+}
+
+// isValidTagRune checks if a Unicode rune is valid in a tag.
+// Uses Unicode categories for proper international character support.
+func isValidTagRune(r rune) bool {
+	// Allow Unicode letters (any script: Latin, CJK, Arabic, Cyrillic, etc.)
+	if unicode.IsLetter(r) {
+		return true
+	}
+
+	// Allow Unicode digits
+	if unicode.IsNumber(r) {
+		return true
+	}
+
+	// Allow emoji and symbols (So category: Symbol, Other)
+	// This includes emoji, which are essential for social media-style tagging
+	if unicode.IsSymbol(r) {
+		return true
+	}
+
+	// Allow specific ASCII symbols for tag structure
+	// Underscore: word separation (snake_case)
+	// Hyphen: word separation (kebab-case)
+	// Forward slash: hierarchical tags (category/subcategory)
+	// Ampersand: compound tags (science&tech)
+	if r == '_' || r == '-' || r == '/' || r == '&' {
+		return true
+	}
+
+	return false
+}
+
+// Parse parses #tag syntax using Unicode-aware validation.
+// Tags support international characters and follow these rules:
+//   - Must start with # followed by valid tag characters
+//   - Valid characters: Unicode letters, Unicode digits, underscore (_), hyphen (-), forward slash (/)
+//   - Maximum length: 100 runes (Unicode characters)
+//   - Stops at: whitespace, punctuation, or other invalid characters
+func (*tagParser) Parse(_ gast.Node, block text.Reader, _ parser.Context) gast.Node {
+	line, _ := block.PeekLine()
+
+	// Must start with #
+	if len(line) == 0 || line[0] != '#' {
+		return nil
+	}
+
+	// Check if it's a heading (## or space after #)
+	if len(line) > 1 {
+		if line[1] == '#' {
+			// It's a heading (##), not a tag
+			return nil
+		}
+		if line[1] == ' ' {
+			// Space after # - heading or just a hash
+			return nil
+		}
+	} else {
+		// Just a lone #
+		return nil
+	}
+
+	// Parse tag using UTF-8 aware rune iteration
+	tagStart := 1
+	pos := tagStart
+	runeCount := 0
+
+	for pos < len(line) {
+		r, size := utf8.DecodeRune(line[pos:])
+
+		// Stop at invalid UTF-8
+		if r == utf8.RuneError && size == 1 {
+			break
+		}
+
+		// Validate character using Unicode categories
+		if !isValidTagRune(r) {
+			break
+		}
+
+		// Enforce max length (by rune count, not byte count)
+		runeCount++
+		if runeCount > MaxTagLength {
+			break
+		}
+
+		pos += size
+	}
+
+	// Must have at least one character after #
+	if pos <= tagStart {
+		return nil
+	}
+
+	// Extract tag (without #)
+	tagName := line[tagStart:pos]
+
+	// Make a copy of the tag name
+	tagCopy := make([]byte, len(tagName))
+	copy(tagCopy, tagName)
+
+	// Advance reader
+	block.Advance(pos)
+
+	// Create node
+	node := &mast.TagNode{
+		Tag: tagCopy,
+	}
+
+	return node
+}

plugin/markdown/parser/tag_test.go

@@ -0,0 +1,251 @@
+package parser
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+
+	mast "github.com/usememos/memos/plugin/markdown/ast"
+)
+
+func TestTagParser(t *testing.T) {
+	tests := []struct {
+		name        string
+		input       string
+		expectedTag string
+		shouldParse bool
+	}{
+		{
+			name:        "basic tag",
+			input:       "#tag",
+			expectedTag: "tag",
+			shouldParse: true,
+		},
+		{
+			name:        "tag with hyphen",
+			input:       "#work-notes",
+			expectedTag: "work-notes",
+			shouldParse: true,
+		},
+		{
+			name:        "tag with ampersand",
+			input:       "#science&tech",
+			expectedTag: "science&tech",
+			shouldParse: true,
+		},
+		{
+			name:        "tag with underscore",
+			input:       "#2024_plans",
+			expectedTag: "2024_plans",
+			shouldParse: true,
+		},
+		{
+			name:        "numeric tag",
+			input:       "#123",
+			expectedTag: "123",
+			shouldParse: true,
+		},
+		{
+			name:        "tag followed by space",
+			input:       "#tag ",
+			expectedTag: "tag",
+			shouldParse: true,
+		},
+		{
+			name:        "tag followed by punctuation",
+			input:       "#tag.",
+			expectedTag: "tag",
+			shouldParse: true,
+		},
+		{
+			name:        "tag in sentence",
+			input:       "#important task",
+			expectedTag: "important",
+			shouldParse: true,
+		},
+		{
+			name:        "heading (##)",
+			input:       "## Heading",
+			expectedTag: "",
+			shouldParse: false,
+		},
+		{
+			name:        "space after hash",
+			input:       "# heading",
+			expectedTag: "",
+			shouldParse: false,
+		},
+		{
+			name:        "lone hash",
+			input:       "#",
+			expectedTag: "",
+			shouldParse: false,
+		},
+		{
+			name:        "hash with space",
+			input:       "# ",
+			expectedTag: "",
+			shouldParse: false,
+		},
+		{
+			name:        "special characters",
+			input:       "#tag@special",
+			expectedTag: "tag",
+			shouldParse: true,
+		},
+		{
+			name:        "mixed case",
+			input:       "#WorkNotes",
+			expectedTag: "WorkNotes",
+			shouldParse: true,
+		},
+		{
+			name:        "hierarchical tag with slash",
+			input:       "#tag1/subtag",
+			expectedTag: "tag1/subtag",
+			shouldParse: true,
+		},
+		{
+			name:        "hierarchical tag with multiple levels",
+			input:       "#tag1/subtag/subtag2",
+			expectedTag: "tag1/subtag/subtag2",
+			shouldParse: true,
+		},
+		{
+			name:        "hierarchical tag followed by space",
+			input:       "#work/notes ",
+			expectedTag: "work/notes",
+			shouldParse: true,
+		},
+		{
+			name:        "hierarchical tag followed by punctuation",
+			input:       "#project/2024.",
+			expectedTag: "project/2024",
+			shouldParse: true,
+		},
+		{
+			name:        "hierarchical tag with numbers and dashes",
+			input:       "#work-log/2024/q1",
+			expectedTag: "work-log/2024/q1",
+			shouldParse: true,
+		},
+		{
+			name:        "Chinese characters",
+			input:       "#测试",
+			expectedTag: "测试",
+			shouldParse: true,
+		},
+		{
+			name:        "Chinese tag followed by space",
+			input:       "#测试 some text",
+			expectedTag: "测试",
+			shouldParse: true,
+		},
+		{
+			name:        "Chinese tag followed by punctuation",
+			input:       "#测试。",
+			expectedTag: "测试",
+			shouldParse: true,
+		},
+		{
+			name:        "mixed Chinese and ASCII",
+			input:       "#测试test123",
+			expectedTag: "测试test123",
+			shouldParse: true,
+		},
+		{
+			name:        "Japanese characters",
+			input:       "#テスト",
+			expectedTag: "テスト",
+			shouldParse: true,
+		},
+		{
+			name:        "Korean characters",
+			input:       "#테스트",
+			expectedTag: "테스트",
+			shouldParse: true,
+		},
+		{
+			name:        "emoji",
+			input:       "#test🚀",
+			expectedTag: "test🚀",
+			shouldParse: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			p := NewTagParser()
+			reader := text.NewReader([]byte(tt.input))
+			ctx := parser.NewContext()
+
+			node := p.Parse(nil, reader, ctx)
+
+			if tt.shouldParse {
+				require.NotNil(t, node, "Expected tag to be parsed")
+				require.IsType(t, &mast.TagNode{}, node)
+
+				tagNode, ok := node.(*mast.TagNode)
+				require.True(t, ok, "Expected node to be *mast.TagNode")
+				assert.Equal(t, tt.expectedTag, string(tagNode.Tag))
+			} else {
+				assert.Nil(t, node, "Expected tag NOT to be parsed")
+			}
+		})
+	}
+}
+
+func TestTagParser_Trigger(t *testing.T) {
+	p := NewTagParser()
+	triggers := p.Trigger()
+
+	assert.Equal(t, []byte{'#'}, triggers)
+}
+
+func TestTagParser_MultipleTags(t *testing.T) {
+	// Test that parser correctly handles multiple tags in sequence
+	input := "#tag1 #tag2"
+
+	p := NewTagParser()
+	reader := text.NewReader([]byte(input))
+	ctx := parser.NewContext()
+
+	// Parse first tag
+	node1 := p.Parse(nil, reader, ctx)
+	require.NotNil(t, node1)
+	tagNode1, ok := node1.(*mast.TagNode)
+	require.True(t, ok, "Expected node1 to be *mast.TagNode")
+	assert.Equal(t, "tag1", string(tagNode1.Tag))
+
+	// Advance past the space
+	reader.Advance(1)
+
+	// Parse second tag
+	node2 := p.Parse(nil, reader, ctx)
+	require.NotNil(t, node2)
+	tagNode2, ok := node2.(*mast.TagNode)
+	require.True(t, ok, "Expected node2 to be *mast.TagNode")
+	assert.Equal(t, "tag2", string(tagNode2.Tag))
+}
+
+func TestTagNode_Kind(t *testing.T) {
+	node := &mast.TagNode{
+		Tag: []byte("test"),
+	}
+
+	assert.Equal(t, mast.KindTag, node.Kind())
+}
+
+func TestTagNode_Dump(t *testing.T) {
+	node := &mast.TagNode{
+		Tag: []byte("test"),
+	}
+
+	// Should not panic
+	assert.NotPanics(t, func() {
+		node.Dump([]byte("#test"), 0)
+	})
+}

plugin/markdown/renderer/markdown_renderer.go

@@ -0,0 +1,266 @@
+package renderer
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+
+	gast "github.com/yuin/goldmark/ast"
+	east "github.com/yuin/goldmark/extension/ast"
+
+	mast "github.com/usememos/memos/plugin/markdown/ast"
+)
+
+// MarkdownRenderer renders goldmark AST back to markdown text.
+type MarkdownRenderer struct {
+	buf *bytes.Buffer
+}
+
+// NewMarkdownRenderer creates a new markdown renderer.
+func NewMarkdownRenderer() *MarkdownRenderer {
+	return &MarkdownRenderer{
+		buf: &bytes.Buffer{},
+	}
+}
+
+// Render renders the AST node to markdown and returns the result.
+func (r *MarkdownRenderer) Render(node gast.Node, source []byte) string {
+	r.buf.Reset()
+	r.renderNode(node, source, 0)
+	return r.buf.String()
+}
+
+// renderNode renders a single node and its children.
+func (r *MarkdownRenderer) renderNode(node gast.Node, source []byte, depth int) {
+	switch n := node.(type) {
+	case *gast.Document:
+		r.renderChildren(n, source, depth)
+
+	case *gast.Paragraph:
+		r.renderChildren(n, source, depth)
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+
+	case *gast.Text:
+		// Text nodes store their content as segments in the source
+		segment := n.Segment
+		r.buf.Write(segment.Value(source))
+		if n.SoftLineBreak() {
+			r.buf.WriteByte('\n')
+		} else if n.HardLineBreak() {
+			r.buf.WriteString("  \n")
+		}
+
+	case *gast.CodeSpan:
+		r.buf.WriteByte('`')
+		r.renderChildren(n, source, depth)
+		r.buf.WriteByte('`')
+
+	case *gast.Emphasis:
+		symbol := "*"
+		if n.Level == 2 {
+			symbol = "**"
+		}
+		r.buf.WriteString(symbol)
+		r.renderChildren(n, source, depth)
+		r.buf.WriteString(symbol)
+
+	case *gast.Link:
+		r.buf.WriteString("[")
+		r.renderChildren(n, source, depth)
+		r.buf.WriteString("](")
+		r.buf.Write(n.Destination)
+		if len(n.Title) > 0 {
+			r.buf.WriteString(` "`)
+			r.buf.Write(n.Title)
+			r.buf.WriteString(`"`)
+		}
+		r.buf.WriteString(")")
+
+	case *gast.AutoLink:
+		url := n.URL(source)
+		if n.AutoLinkType == gast.AutoLinkEmail {
+			r.buf.WriteString("<")
+			r.buf.Write(url)
+			r.buf.WriteString(">")
+		} else {
+			r.buf.Write(url)
+		}
+
+	case *gast.Image:
+		r.buf.WriteString("![")
+		r.renderChildren(n, source, depth)
+		r.buf.WriteString("](")
+		r.buf.Write(n.Destination)
+		if len(n.Title) > 0 {
+			r.buf.WriteString(` "`)
+			r.buf.Write(n.Title)
+			r.buf.WriteString(`"`)
+		}
+		r.buf.WriteString(")")
+
+	case *gast.Heading:
+		r.buf.WriteString(strings.Repeat("#", n.Level))
+		r.buf.WriteByte(' ')
+		r.renderChildren(n, source, depth)
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+
+	case *gast.CodeBlock, *gast.FencedCodeBlock:
+		r.renderCodeBlock(n, source)
+
+	case *gast.Blockquote:
+		// Render each child line with "> " prefix
+		r.renderBlockquote(n, source, depth)
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+
+	case *gast.List:
+		r.renderChildren(n, source, depth)
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+
+	case *gast.ListItem:
+		r.renderListItem(n, source, depth)
+
+	case *gast.ThematicBreak:
+		r.buf.WriteString("---")
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+
+	case *east.Strikethrough:
+		r.buf.WriteString("~~")
+		r.renderChildren(n, source, depth)
+		r.buf.WriteString("~~")
+
+	case *east.TaskCheckBox:
+		if n.IsChecked {
+			r.buf.WriteString("[x] ")
+		} else {
+			r.buf.WriteString("[ ] ")
+		}
+
+	case *east.Table:
+		r.renderTable(n, source)
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+
+	// Custom Memos nodes
+	case *mast.TagNode:
+		r.buf.WriteByte('#')
+		r.buf.Write(n.Tag)
+
+	default:
+		// For unknown nodes, try to render children
+		r.renderChildren(n, source, depth)
+	}
+}
+
+// renderChildren renders all children of a node.
+func (r *MarkdownRenderer) renderChildren(node gast.Node, source []byte, depth int) {
+	child := node.FirstChild()
+	for child != nil {
+		r.renderNode(child, source, depth+1)
+		child = child.NextSibling()
+	}
+}
+
+// renderCodeBlock renders a code block.
+func (r *MarkdownRenderer) renderCodeBlock(node gast.Node, source []byte) {
+	if fenced, ok := node.(*gast.FencedCodeBlock); ok {
+		// Fenced code block with language
+		r.buf.WriteString("```")
+		if lang := fenced.Language(source); len(lang) > 0 {
+			r.buf.Write(lang)
+		}
+		r.buf.WriteByte('\n')
+
+		// Write all lines
+		lines := fenced.Lines()
+		for i := 0; i < lines.Len(); i++ {
+			line := lines.At(i)
+			r.buf.Write(line.Value(source))
+		}
+
+		r.buf.WriteString("```")
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+	} else if codeBlock, ok := node.(*gast.CodeBlock); ok {
+		// Indented code block
+		lines := codeBlock.Lines()
+		for i := 0; i < lines.Len(); i++ {
+			line := lines.At(i)
+			r.buf.WriteString("    ")
+			r.buf.Write(line.Value(source))
+		}
+		if node.NextSibling() != nil {
+			r.buf.WriteString("\n\n")
+		}
+	}
+}
+
+// renderBlockquote renders a blockquote with "> " prefix.
+func (r *MarkdownRenderer) renderBlockquote(node *gast.Blockquote, source []byte, depth int) {
+	// Create a temporary buffer for the blockquote content
+	tempBuf := &bytes.Buffer{}
+	tempRenderer := &MarkdownRenderer{buf: tempBuf}
+	tempRenderer.renderChildren(node, source, depth)
+
+	// Add "> " prefix to each line
+	content := tempBuf.String()
+	lines := strings.Split(strings.TrimRight(content, "\n"), "\n")
+	for i, line := range lines {
+		r.buf.WriteString("> ")
+		r.buf.WriteString(line)
+		if i < len(lines)-1 {
+			r.buf.WriteByte('\n')
+		}
+	}
+}
+
+// renderListItem renders a list item with proper indentation and markers.
+func (r *MarkdownRenderer) renderListItem(node *gast.ListItem, source []byte, depth int) {
+	parent := node.Parent()
+	list, ok := parent.(*gast.List)
+	if !ok {
+		r.renderChildren(node, source, depth)
+		return
+	}
+
+	// Add indentation only for nested lists
+	// Document=0, List=1, ListItem=2 (no indent), nested ListItem=3+ (indent)
+	if depth > 2 {
+		indent := strings.Repeat("  ", depth-2)
+		r.buf.WriteString(indent)
+	}
+
+	// Add list marker
+	if list.IsOrdered() {
+		fmt.Fprintf(r.buf, "%d. ", list.Start)
+		list.Start++ // Increment for next item
+	} else {
+		r.buf.WriteString("- ")
+	}
+
+	// Render content
+	r.renderChildren(node, source, depth)
+
+	// Add newline if there's a next sibling
+	if node.NextSibling() != nil {
+		r.buf.WriteByte('\n')
+	}
+}
+
+// renderTable renders a table in markdown format.
+func (r *MarkdownRenderer) renderTable(table *east.Table, source []byte) {
+	// This is a simplified table renderer
+	// A full implementation would need to handle alignment, etc.
+	r.renderChildren(table, source, 0)
+}

plugin/markdown/renderer/markdown_renderer_test.go

@@ -0,0 +1,176 @@
+package renderer
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/extension"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+
+	"github.com/usememos/memos/plugin/markdown/extensions"
+)
+
+func TestMarkdownRenderer(t *testing.T) {
+	// Create goldmark instance with all extensions
+	md := goldmark.New(
+		goldmark.WithExtensions(
+			extension.GFM,
+			extensions.TagExtension,
+		),
+		goldmark.WithParserOptions(
+			parser.WithAutoHeadingID(),
+		),
+	)
+
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "simple text",
+			input:    "Hello world",
+			expected: "Hello world",
+		},
+		{
+			name:     "paragraph with newlines",
+			input:    "First paragraph\n\nSecond paragraph",
+			expected: "First paragraph\n\nSecond paragraph",
+		},
+		{
+			name:     "emphasis",
+			input:    "This is *italic* and **bold** text",
+			expected: "This is *italic* and **bold** text",
+		},
+		{
+			name:     "headings",
+			input:    "# Heading 1\n\n## Heading 2\n\n### Heading 3",
+			expected: "# Heading 1\n\n## Heading 2\n\n### Heading 3",
+		},
+		{
+			name:     "link",
+			input:    "Check [this link](https://example.com)",
+			expected: "Check [this link](https://example.com)",
+		},
+		{
+			name:     "image",
+			input:    "![alt text](image.png)",
+			expected: "![alt text](image.png)",
+		},
+		{
+			name:     "code inline",
+			input:    "This is `inline code` here",
+			expected: "This is `inline code` here",
+		},
+		{
+			name:     "code block fenced",
+			input:    "```go\nfunc main() {\n}\n```",
+			expected: "```go\nfunc main() {\n}\n```",
+		},
+		{
+			name:     "unordered list",
+			input:    "- Item 1\n- Item 2\n- Item 3",
+			expected: "- Item 1\n- Item 2\n- Item 3",
+		},
+		{
+			name:     "ordered list",
+			input:    "1. First\n2. Second\n3. Third",
+			expected: "1. First\n2. Second\n3. Third",
+		},
+		{
+			name:     "blockquote",
+			input:    "> This is a quote\n> Second line",
+			expected: "> This is a quote\n> Second line",
+		},
+		{
+			name:     "horizontal rule",
+			input:    "Text before\n\n---\n\nText after",
+			expected: "Text before\n\n---\n\nText after",
+		},
+		{
+			name:     "strikethrough",
+			input:    "This is ~~deleted~~ text",
+			expected: "This is ~~deleted~~ text",
+		},
+		{
+			name:     "task list",
+			input:    "- [x] Completed task\n- [ ] Incomplete task",
+			expected: "- [x] Completed task\n- [ ] Incomplete task",
+		},
+		{
+			name:     "tag",
+			input:    "This has #tag in it",
+			expected: "This has #tag in it",
+		},
+		{
+			name:     "multiple tags",
+			input:    "#work #important meeting notes",
+			expected: "#work #important meeting notes",
+		},
+		{
+			name:     "complex mixed content",
+			input:    "# Meeting Notes\n\n**Date**: 2024-01-01\n\n## Attendees\n- Alice\n- Bob\n\n## Discussion\n\nWe discussed #project status.\n\n```python\nprint('hello')\n```",
+			expected: "# Meeting Notes\n\n**Date**: 2024-01-01\n\n## Attendees\n\n- Alice\n- Bob\n\n## Discussion\n\nWe discussed #project status.\n\n```python\nprint('hello')\n```",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Parse the input
+			source := []byte(tt.input)
+			reader := text.NewReader(source)
+			doc := md.Parser().Parse(reader)
+			require.NotNil(t, doc)
+
+			// Render back to markdown
+			renderer := NewMarkdownRenderer()
+			result := renderer.Render(doc, source)
+
+			// For debugging
+			if result != tt.expected {
+				t.Logf("Input:    %q", tt.input)
+				t.Logf("Expected: %q", tt.expected)
+				t.Logf("Got:      %q", result)
+			}
+
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+func TestMarkdownRendererPreservesStructure(t *testing.T) {
+	// Test that parsing and rendering preserves structure
+	md := goldmark.New(
+		goldmark.WithExtensions(
+			extension.GFM,
+			extensions.TagExtension,
+		),
+	)
+
+	inputs := []string{
+		"# Title\n\nParagraph",
+		"**Bold** and *italic*",
+		"- List\n- Items",
+		"#tag #another",
+		"> Quote",
+	}
+
+	renderer := NewMarkdownRenderer()
+
+	for _, input := range inputs {
+		t.Run(input, func(t *testing.T) {
+			source := []byte(input)
+			reader := text.NewReader(source)
+			doc := md.Parser().Parse(reader)
+
+			result := renderer.Render(doc, source)
+
+			// The result should be structurally similar
+			// (may have minor formatting differences)
+			assert.NotEmpty(t, result)
+		})
+	}
+}

plugin/scheduler/README.md

@@ -0,0 +1,367 @@
+# Scheduler Plugin
+
+A production-ready, GitHub Actions-inspired cron job scheduler for Go.
+
+## Features
+
+- **Standard Cron Syntax**: Supports both 5-field and 6-field (with seconds) cron expressions
+- **Timezone-Aware**: Explicit timezone handling to avoid DST surprises
+- **Middleware Pattern**: Composable job wrappers for logging, metrics, panic recovery, timeouts
+- **Graceful Shutdown**: Jobs complete cleanly or cancel when context expires
+- **Zero Dependencies**: Core functionality uses only the standard library
+- **Type-Safe**: Strong typing with clear error messages
+- **Well-Tested**: Comprehensive test coverage
+
+## Installation
+
+This package is included with Memos. No separate installation required.
+
+## Quick Start
+
+```go
+package main
+
+import (
+    "context"
+    "fmt"
+    "github.com/usememos/memos/plugin/scheduler"
+)
+
+func main() {
+    s := scheduler.New()
+
+    s.Register(&scheduler.Job{
+        Name:     "daily-cleanup",
+        Schedule: "0 2 * * *", // 2 AM daily
+        Handler: func(ctx context.Context) error {
+            fmt.Println("Running cleanup...")
+            return nil
+        },
+    })
+
+    s.Start()
+    defer s.Stop(context.Background())
+
+    // Keep running...
+    select {}
+}
+```
+
+## Cron Expression Format
+
+### 5-Field Format (Standard)
+```
+┌───────────── minute (0 - 59)
+│ ┌───────────── hour (0 - 23)
+│ │ ┌───────────── day of month (1 - 31)
+│ │ │ ┌───────────── month (1 - 12)
+│ │ │ │ ┌───────────── day of week (0 - 7) (Sunday = 0 or 7)
+│ │ │ │ │
+* * * * *
+```
+
+### 6-Field Format (With Seconds)
+```
+┌───────────── second (0 - 59)
+│ ┌───────────── minute (0 - 59)
+│ │ ┌───────────── hour (0 - 23)
+│ │ │ ┌───────────── day of month (1 - 31)
+│ │ │ │ ┌───────────── month (1 - 12)
+│ │ │ │ │ ┌───────────── day of week (0 - 7)
+│ │ │ │ │ │
+* * * * * *
+```
+
+### Special Characters
+
+- `*` - Any value (every minute, every hour, etc.)
+- `,` - List of values: `1,15,30` (1st, 15th, and 30th)
+- `-` - Range: `9-17` (9 AM through 5 PM)
+- `/` - Step: `*/15` (every 15 units)
+
+### Common Examples
+
+| Schedule | Description |
+|----------|-------------|
+| `* * * * *` | Every minute |
+| `0 * * * *` | Every hour |
+| `0 0 * * *` | Daily at midnight |
+| `0 9 * * 1-5` | Weekdays at 9 AM |
+| `*/15 * * * *` | Every 15 minutes |
+| `0 0 1 * *` | First day of every month |
+| `0 0 * * 0` | Every Sunday at midnight |
+| `30 14 * * *` | Every day at 2:30 PM |
+
+## Timezone Support
+
+```go
+// Global timezone for all jobs
+s := scheduler.New(
+    scheduler.WithTimezone("America/New_York"),
+)
+
+// Per-job timezone (overrides global)
+s.Register(&scheduler.Job{
+    Name:     "tokyo-report",
+    Schedule: "0 9 * * *", // 9 AM Tokyo time
+    Timezone: "Asia/Tokyo",
+    Handler: func(ctx context.Context) error {
+        // Runs at 9 AM in Tokyo
+        return nil
+    },
+})
+```
+
+**Important**: Always use IANA timezone names (`America/New_York`, not `EST`).
+
+## Middleware
+
+Middleware wraps job handlers to add cross-cutting behavior. Multiple middleware can be chained together.
+
+### Built-in Middleware
+
+#### Recovery (Panic Handling)
+
+```go
+s := scheduler.New(
+    scheduler.WithMiddleware(
+        scheduler.Recovery(func(jobName string, r interface{}) {
+            log.Printf("Job %s panicked: %v", jobName, r)
+        }),
+    ),
+)
+```
+
+#### Logging
+
+```go
+type Logger interface {
+    Info(msg string, args ...interface{})
+    Error(msg string, args ...interface{})
+}
+
+s := scheduler.New(
+    scheduler.WithMiddleware(
+        scheduler.Logging(myLogger),
+    ),
+)
+```
+
+#### Timeout
+
+```go
+s := scheduler.New(
+    scheduler.WithMiddleware(
+        scheduler.Timeout(5 * time.Minute),
+    ),
+)
+```
+
+### Combining Middleware
+
+```go
+s := scheduler.New(
+    scheduler.WithMiddleware(
+        scheduler.Recovery(panicHandler),
+        scheduler.Logging(logger),
+        scheduler.Timeout(10 * time.Minute),
+    ),
+)
+```
+
+**Order matters**: Middleware are applied left-to-right. In the example above:
+1. Recovery (outermost) catches panics from everything
+2. Logging logs the execution
+3. Timeout (innermost) wraps the actual handler
+
+### Custom Middleware
+
+```go
+func Metrics(recorder MetricsRecorder) scheduler.Middleware {
+    return func(next scheduler.JobHandler) scheduler.JobHandler {
+        return func(ctx context.Context) error {
+            start := time.Now()
+            err := next(ctx)
+            duration := time.Since(start)
+
+            jobName := scheduler.GetJobName(ctx)
+            recorder.Record(jobName, duration, err)
+
+            return err
+        }
+    }
+}
+```
+
+## Graceful Shutdown
+
+Always use `Stop()` with a context to allow jobs to finish cleanly:
+
+```go
+// Give jobs up to 30 seconds to complete
+ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+defer cancel()
+
+if err := s.Stop(ctx); err != nil {
+    log.Printf("Shutdown error: %v", err)
+}
+```
+
+Jobs should respect context cancellation:
+
+```go
+Handler: func(ctx context.Context) error {
+    for i := 0; i < 100; i++ {
+        select {
+        case <-ctx.Done():
+            return ctx.Err() // Canceled
+        default:
+            // Do work
+        }
+    }
+    return nil
+}
+```
+
+## Best Practices
+
+### 1. Always Name Your Jobs
+
+Names are used for logging, metrics, and debugging:
+
+```go
+Name: "user-cleanup-job" // Good
+Name: "job1"             // Bad
+```
+
+### 2. Add Descriptions and Tags
+
+```go
+s.Register(&scheduler.Job{
+    Name:        "stale-session-cleanup",
+    Description: "Removes user sessions older than 30 days",
+    Tags:        []string{"maintenance", "security"},
+    Schedule:    "0 3 * * *",
+    Handler:     cleanupSessions,
+})
+```
+
+### 3. Use Appropriate Middleware
+
+Always include Recovery and Logging in production:
+
+```go
+scheduler.New(
+    scheduler.WithMiddleware(
+        scheduler.Recovery(logPanic),
+        scheduler.Logging(logger),
+    ),
+)
+```
+
+### 4. Avoid Scheduling Exactly on the Hour
+
+Many systems schedule jobs at `:00`, causing load spikes. Stagger your jobs:
+
+```go
+"5 2 * * *"  // 2:05 AM (good)
+"0 2 * * *"  // 2:00 AM (often overloaded)
+```
+
+### 5. Make Jobs Idempotent
+
+Jobs may run multiple times (crash recovery, etc.). Design them to be safely re-runnable:
+
+```go
+Handler: func(ctx context.Context) error {
+    // Use unique constraint or check-before-insert
+    db.Exec("INSERT IGNORE INTO processed_items ...")
+    return nil
+}
+```
+
+### 6. Handle Timezones Explicitly
+
+Always specify timezone for business-hour jobs:
+
+```go
+Timezone: "America/New_York" // Good
+// Timezone: ""              // Bad (defaults to UTC)
+```
+
+### 7. Test Your Cron Expressions
+
+Use a cron expression calculator before deploying:
+- [crontab.guru](https://crontab.guru/)
+- Write unit tests with the parser
+
+## Testing Jobs
+
+Test job handlers independently of the scheduler:
+
+```go
+func TestCleanupJob(t *testing.T) {
+    ctx := context.Background()
+
+    err := cleanupHandler(ctx)
+    if err != nil {
+        t.Fatalf("cleanup failed: %v", err)
+    }
+
+    // Verify cleanup occurred
+}
+```
+
+Test schedule parsing:
+
+```go
+func TestScheduleParsing(t *testing.T) {
+    job := &scheduler.Job{
+        Name:     "test",
+        Schedule: "0 2 * * *",
+        Handler:  func(ctx context.Context) error { return nil },
+    }
+
+    if err := job.Validate(); err != nil {
+        t.Fatalf("invalid job: %v", err)
+    }
+}
+```
+
+## Comparison to Other Solutions
+
+| Feature | scheduler | robfig/cron | github.com/go-co-op/gocron |
+|---------|-----------|-------------|----------------------------|
+| Standard cron syntax | ✅ | ✅ | ✅ |
+| Seconds support | ✅ | ✅ | ✅ |
+| Timezone support | ✅ | ✅ | ✅ |
+| Middleware pattern | ✅ | ⚠️ (basic) | ❌ |
+| Graceful shutdown | ✅ | ⚠️ (basic) | ✅ |
+| Zero dependencies | ✅ | ❌ | ❌ |
+| Job metadata | ✅ | ❌ | ⚠️ (limited) |
+
+## API Reference
+
+See [example_test.go](./example_test.go) for comprehensive examples.
+
+### Core Types
+
+- `Scheduler` - Manages scheduled jobs
+- `Job` - Job definition with schedule and handler
+- `Middleware` - Function that wraps job handlers
+
+### Functions
+
+- `New(opts ...Option) *Scheduler` - Create new scheduler
+- `WithTimezone(tz string) Option` - Set default timezone
+- `WithMiddleware(mw ...Middleware) Option` - Add middleware
+
+### Methods
+
+- `Register(job *Job) error` - Add job to scheduler
+- `Start() error` - Begin executing jobs
+- `Stop(ctx context.Context) error` - Graceful shutdown
+
+## License
+
+This package is part of the Memos project and shares its license.

plugin/scheduler/doc.go

@@ -0,0 +1,35 @@
+// Package scheduler provides a GitHub Actions-inspired cron job scheduler.
+//
+// Features:
+//   - Standard cron expression syntax (5-field and 6-field formats)
+//   - Timezone-aware scheduling
+//   - Middleware pattern for cross-cutting concerns (logging, metrics, recovery)
+//   - Graceful shutdown with context cancellation
+//   - Zero external dependencies
+//
+// Basic usage:
+//
+//	s := scheduler.New()
+//
+//	s.Register(&scheduler.Job{
+//		Name:     "daily-cleanup",
+//		Schedule: "0 2 * * *", // 2 AM daily
+//		Handler: func(ctx context.Context) error {
+//			// Your cleanup logic here
+//			return nil
+//		},
+//	})
+//
+//	s.Start()
+//	defer s.Stop(context.Background())
+//
+// With middleware:
+//
+//	s := scheduler.New(
+//		scheduler.WithTimezone("America/New_York"),
+//		scheduler.WithMiddleware(
+//			scheduler.Recovery(),
+//			scheduler.Logging(),
+//		),
+//	)
+package scheduler

plugin/scheduler/example_test.go

@@ -0,0 +1,165 @@
+package scheduler_test
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os"
+	"time"
+
+	"github.com/usememos/memos/plugin/scheduler"
+)
+
+// Example demonstrates basic scheduler usage.
+func Example_basic() {
+	s := scheduler.New()
+
+	s.Register(&scheduler.Job{
+		Name:        "hello",
+		Schedule:    "*/5 * * * *", // Every 5 minutes
+		Description: "Say hello",
+		Handler: func(_ context.Context) error {
+			fmt.Println("Hello from scheduler!")
+			return nil
+		},
+	})
+
+	s.Start()
+	defer s.Stop(context.Background())
+
+	// Scheduler runs in background
+	time.Sleep(100 * time.Millisecond)
+}
+
+// Example demonstrates timezone-aware scheduling.
+func Example_timezone() {
+	s := scheduler.New(
+		scheduler.WithTimezone("America/New_York"),
+	)
+
+	s.Register(&scheduler.Job{
+		Name:     "daily-report",
+		Schedule: "0 9 * * *", // 9 AM in New York
+		Handler: func(_ context.Context) error {
+			fmt.Println("Generating daily report...")
+			return nil
+		},
+	})
+
+	s.Start()
+	defer s.Stop(context.Background())
+}
+
+// Example demonstrates middleware usage.
+func Example_middleware() {
+	logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
+
+	s := scheduler.New(
+		scheduler.WithMiddleware(
+			scheduler.Recovery(func(jobName string, r interface{}) {
+				logger.Error("Job panicked", "job", jobName, "panic", r)
+			}),
+			scheduler.Logging(&slogAdapter{logger}),
+			scheduler.Timeout(5*time.Minute),
+		),
+	)
+
+	s.Register(&scheduler.Job{
+		Name:     "data-sync",
+		Schedule: "0 */2 * * *", // Every 2 hours
+		Handler: func(_ context.Context) error {
+			// Your sync logic here
+			return nil
+		},
+	})
+
+	s.Start()
+	defer s.Stop(context.Background())
+}
+
+// slogAdapter adapts slog.Logger to scheduler.Logger interface.
+type slogAdapter struct {
+	logger *slog.Logger
+}
+
+func (a *slogAdapter) Info(msg string, args ...interface{}) {
+	a.logger.Info(msg, args...)
+}
+
+func (a *slogAdapter) Error(msg string, args ...interface{}) {
+	a.logger.Error(msg, args...)
+}
+
+// Example demonstrates multiple jobs with different schedules.
+func Example_multipleJobs() {
+	s := scheduler.New()
+
+	// Cleanup old data every night at 2 AM
+	s.Register(&scheduler.Job{
+		Name:     "cleanup",
+		Schedule: "0 2 * * *",
+		Tags:     []string{"maintenance"},
+		Handler: func(_ context.Context) error {
+			fmt.Println("Cleaning up old data...")
+			return nil
+		},
+	})
+
+	// Health check every 5 minutes
+	s.Register(&scheduler.Job{
+		Name:     "health-check",
+		Schedule: "*/5 * * * *",
+		Tags:     []string{"monitoring"},
+		Handler: func(_ context.Context) error {
+			fmt.Println("Running health check...")
+			return nil
+		},
+	})
+
+	// Weekly backup on Sundays at 1 AM
+	s.Register(&scheduler.Job{
+		Name:     "weekly-backup",
+		Schedule: "0 1 * * 0",
+		Tags:     []string{"backup"},
+		Handler: func(_ context.Context) error {
+			fmt.Println("Creating weekly backup...")
+			return nil
+		},
+	})
+
+	s.Start()
+	defer s.Stop(context.Background())
+}
+
+// Example demonstrates graceful shutdown with timeout.
+func Example_gracefulShutdown() {
+	s := scheduler.New()
+
+	s.Register(&scheduler.Job{
+		Name:     "long-running",
+		Schedule: "* * * * *",
+		Handler: func(ctx context.Context) error {
+			select {
+			case <-time.After(30 * time.Second):
+				fmt.Println("Job completed")
+			case <-ctx.Done():
+				fmt.Println("Job canceled, cleaning up...")
+				return ctx.Err()
+			}
+			return nil
+		},
+	})
+
+	s.Start()
+
+	// Simulate shutdown signal
+	time.Sleep(5 * time.Second)
+
+	// Give jobs 10 seconds to finish
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	if err := s.Stop(shutdownCtx); err != nil {
+		fmt.Printf("Shutdown error: %v\n", err)
+	}
+}

plugin/scheduler/integration_test.go

@@ -0,0 +1,393 @@
+package scheduler_test
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/usememos/memos/plugin/scheduler"
+)
+
+// TestRealWorldScenario tests a realistic multi-job scenario.
+func TestRealWorldScenario(t *testing.T) {
+	var (
+		quickJobCount  atomic.Int32
+		hourlyJobCount atomic.Int32
+		logEntries     []string
+		logMu          sync.Mutex
+	)
+
+	logger := &testLogger{
+		onInfo: func(msg string, _ ...interface{}) {
+			logMu.Lock()
+			logEntries = append(logEntries, fmt.Sprintf("INFO: %s", msg))
+			logMu.Unlock()
+		},
+		onError: func(msg string, _ ...interface{}) {
+			logMu.Lock()
+			logEntries = append(logEntries, fmt.Sprintf("ERROR: %s", msg))
+			logMu.Unlock()
+		},
+	}
+
+	s := scheduler.New(
+		scheduler.WithTimezone("UTC"),
+		scheduler.WithMiddleware(
+			scheduler.Recovery(func(jobName string, r interface{}) {
+				t.Logf("Job %s panicked: %v", jobName, r)
+			}),
+			scheduler.Logging(logger),
+			scheduler.Timeout(5*time.Second),
+		),
+	)
+
+	// Quick job (every second)
+	s.Register(&scheduler.Job{
+		Name:     "quick-check",
+		Schedule: "* * * * * *",
+		Handler: func(_ context.Context) error {
+			quickJobCount.Add(1)
+			time.Sleep(100 * time.Millisecond)
+			return nil
+		},
+	})
+
+	// Slower job (every 2 seconds)
+	s.Register(&scheduler.Job{
+		Name:     "slow-process",
+		Schedule: "*/2 * * * * *",
+		Handler: func(_ context.Context) error {
+			hourlyJobCount.Add(1)
+			time.Sleep(500 * time.Millisecond)
+			return nil
+		},
+	})
+
+	// Start scheduler
+	if err := s.Start(); err != nil {
+		t.Fatalf("failed to start scheduler: %v", err)
+	}
+
+	// Let it run for 5 seconds
+	time.Sleep(5 * time.Second)
+
+	// Graceful shutdown
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	if err := s.Stop(ctx); err != nil {
+		t.Fatalf("failed to stop scheduler: %v", err)
+	}
+
+	// Verify execution counts
+	quick := quickJobCount.Load()
+	slow := hourlyJobCount.Load()
+
+	t.Logf("Quick job ran %d times", quick)
+	t.Logf("Slow job ran %d times", slow)
+
+	if quick < 4 {
+		t.Errorf("expected quick job to run at least 4 times, ran %d", quick)
+	}
+
+	if slow < 2 {
+		t.Errorf("expected slow job to run at least 2 times, ran %d", slow)
+	}
+
+	// Verify logging
+	logMu.Lock()
+	defer logMu.Unlock()
+
+	hasStartLog := false
+	hasCompleteLog := false
+	for _, entry := range logEntries {
+		if contains(entry, "Job started") {
+			hasStartLog = true
+		}
+		if contains(entry, "Job completed") {
+			hasCompleteLog = true
+		}
+	}
+
+	if !hasStartLog {
+		t.Error("expected job start logs")
+	}
+	if !hasCompleteLog {
+		t.Error("expected job completion logs")
+	}
+}
+
+// TestCancellationDuringExecution verifies jobs can be canceled mid-execution.
+func TestCancellationDuringExecution(t *testing.T) {
+	var canceled atomic.Bool
+	var started atomic.Bool
+
+	s := scheduler.New()
+
+	s.Register(&scheduler.Job{
+		Name:     "long-job",
+		Schedule: "* * * * * *",
+		Handler: func(ctx context.Context) error {
+			started.Store(true)
+			// Simulate long-running work
+			for i := 0; i < 100; i++ {
+				select {
+				case <-ctx.Done():
+					canceled.Store(true)
+					return ctx.Err()
+				case <-time.After(100 * time.Millisecond):
+					// Keep working
+				}
+			}
+			return nil
+		},
+	})
+
+	if err := s.Start(); err != nil {
+		t.Fatalf("failed to start: %v", err)
+	}
+
+	// Wait until job starts
+	for i := 0; i < 30; i++ {
+		if started.Load() {
+			break
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+
+	if !started.Load() {
+		t.Fatal("job did not start within timeout")
+	}
+
+	// Stop with reasonable timeout
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := s.Stop(ctx); err != nil {
+		t.Logf("stop returned error (may be expected): %v", err)
+	}
+
+	if !canceled.Load() {
+		t.Error("expected job to detect cancellation")
+	}
+}
+
+// TestTimezoneHandling verifies timezone-aware scheduling.
+func TestTimezoneHandling(t *testing.T) {
+	// Parse a schedule in a specific timezone
+	schedule, err := scheduler.ParseCronExpression("0 9 * * *") // 9 AM
+	if err != nil {
+		t.Fatalf("failed to parse schedule: %v", err)
+	}
+
+	// Test in New York timezone
+	nyc, err := time.LoadLocation("America/New_York")
+	if err != nil {
+		t.Fatalf("failed to load timezone: %v", err)
+	}
+
+	// Current time: 8:30 AM in New York
+	now := time.Date(2025, 1, 15, 8, 30, 0, 0, nyc)
+
+	// Next run should be 9:00 AM same day
+	next := schedule.Next(now)
+	expected := time.Date(2025, 1, 15, 9, 0, 0, 0, nyc)
+
+	if !next.Equal(expected) {
+		t.Errorf("next = %v, expected %v", next, expected)
+	}
+
+	// If it's already past 9 AM
+	now = time.Date(2025, 1, 15, 9, 30, 0, 0, nyc)
+	next = schedule.Next(now)
+	expected = time.Date(2025, 1, 16, 9, 0, 0, 0, nyc)
+
+	if !next.Equal(expected) {
+		t.Errorf("next = %v, expected %v", next, expected)
+	}
+}
+
+// TestErrorPropagation verifies error handling.
+func TestErrorPropagation(t *testing.T) {
+	var errorLogged atomic.Bool
+
+	logger := &testLogger{
+		onError: func(msg string, _ ...interface{}) {
+			if msg == "Job failed" {
+				errorLogged.Store(true)
+			}
+		},
+	}
+
+	s := scheduler.New(
+		scheduler.WithMiddleware(
+			scheduler.Logging(logger),
+		),
+	)
+
+	s.Register(&scheduler.Job{
+		Name:     "failing-job",
+		Schedule: "* * * * * *",
+		Handler: func(_ context.Context) error {
+			return errors.New("intentional error")
+		},
+	})
+
+	if err := s.Start(); err != nil {
+		t.Fatalf("failed to start: %v", err)
+	}
+
+	// Let it run once
+	time.Sleep(1500 * time.Millisecond)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := s.Stop(ctx); err != nil {
+		t.Fatalf("failed to stop: %v", err)
+	}
+
+	if !errorLogged.Load() {
+		t.Error("expected error to be logged")
+	}
+}
+
+// TestPanicRecovery verifies panic recovery middleware.
+func TestPanicRecovery(t *testing.T) {
+	var panicRecovered atomic.Bool
+
+	s := scheduler.New(
+		scheduler.WithMiddleware(
+			scheduler.Recovery(func(jobName string, r interface{}) {
+				panicRecovered.Store(true)
+				t.Logf("Recovered from panic in job %s: %v", jobName, r)
+			}),
+		),
+	)
+
+	s.Register(&scheduler.Job{
+		Name:     "panicking-job",
+		Schedule: "* * * * * *",
+		Handler: func(_ context.Context) error {
+			panic("intentional panic for testing")
+		},
+	})
+
+	if err := s.Start(); err != nil {
+		t.Fatalf("failed to start: %v", err)
+	}
+
+	// Let it run once
+	time.Sleep(1500 * time.Millisecond)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := s.Stop(ctx); err != nil {
+		t.Fatalf("failed to stop: %v", err)
+	}
+
+	if !panicRecovered.Load() {
+		t.Error("expected panic to be recovered")
+	}
+}
+
+// TestMultipleJobsWithDifferentSchedules verifies concurrent job execution.
+func TestMultipleJobsWithDifferentSchedules(t *testing.T) {
+	var (
+		job1Count atomic.Int32
+		job2Count atomic.Int32
+		job3Count atomic.Int32
+	)
+
+	s := scheduler.New()
+
+	// Job 1: Every second
+	s.Register(&scheduler.Job{
+		Name:     "job-1sec",
+		Schedule: "* * * * * *",
+		Handler: func(_ context.Context) error {
+			job1Count.Add(1)
+			return nil
+		},
+	})
+
+	// Job 2: Every 2 seconds
+	s.Register(&scheduler.Job{
+		Name:     "job-2sec",
+		Schedule: "*/2 * * * * *",
+		Handler: func(_ context.Context) error {
+			job2Count.Add(1)
+			return nil
+		},
+	})
+
+	// Job 3: Every 3 seconds
+	s.Register(&scheduler.Job{
+		Name:     "job-3sec",
+		Schedule: "*/3 * * * * *",
+		Handler: func(_ context.Context) error {
+			job3Count.Add(1)
+			return nil
+		},
+	})
+
+	if err := s.Start(); err != nil {
+		t.Fatalf("failed to start: %v", err)
+	}
+
+	// Let them run for 6 seconds
+	time.Sleep(6 * time.Second)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	if err := s.Stop(ctx); err != nil {
+		t.Fatalf("failed to stop: %v", err)
+	}
+
+	// Verify counts (allowing for timing variance)
+	c1 := job1Count.Load()
+	c2 := job2Count.Load()
+	c3 := job3Count.Load()
+
+	t.Logf("Job 1 ran %d times, Job 2 ran %d times, Job 3 ran %d times", c1, c2, c3)
+
+	if c1 < 5 {
+		t.Errorf("expected job1 to run at least 5 times, ran %d", c1)
+	}
+	if c2 < 2 {
+		t.Errorf("expected job2 to run at least 2 times, ran %d", c2)
+	}
+	if c3 < 1 {
+		t.Errorf("expected job3 to run at least 1 time, ran %d", c3)
+	}
+}
+
+// Helpers
+
+type testLogger struct {
+	onInfo  func(msg string, args ...interface{})
+	onError func(msg string, args ...interface{})
+}
+
+func (l *testLogger) Info(msg string, args ...interface{}) {
+	if l.onInfo != nil {
+		l.onInfo(msg, args...)
+	}
+}
+
+func (l *testLogger) Error(msg string, args ...interface{}) {
+	if l.onError != nil {
+		l.onError(msg, args...)
+	}
+}
+
+func contains(s, substr string) bool {
+	return strings.Contains(s, substr)
+}

plugin/scheduler/job.go

@@ -0,0 +1,58 @@
+package scheduler
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+)
+
+// JobHandler is the function signature for scheduled job handlers.
+// The context passed to the handler will be canceled if the scheduler is shutting down.
+type JobHandler func(ctx context.Context) error
+
+// Job represents a scheduled task.
+type Job struct {
+	// Name is a unique identifier for this job (required).
+	// Used for logging and metrics.
+	Name string
+
+	// Schedule is a cron expression defining when this job runs (required).
+	// Supports standard 5-field format: "minute hour day month weekday"
+	// Examples: "0 * * * *" (hourly), "0 0 * * *" (daily at midnight)
+	Schedule string
+
+	// Timezone for schedule evaluation (optional, defaults to UTC).
+	// Use IANA timezone names: "America/New_York", "Europe/London", etc.
+	Timezone string
+
+	// Handler is the function to execute when the job triggers (required).
+	Handler JobHandler
+
+	// Description provides human-readable context about what this job does (optional).
+	Description string
+
+	// Tags allow categorizing jobs for filtering/monitoring (optional).
+	Tags []string
+}
+
+// Validate checks if the job definition is valid.
+func (j *Job) Validate() error {
+	if j.Name == "" {
+		return errors.New("job name is required")
+	}
+
+	if j.Schedule == "" {
+		return errors.New("job schedule is required")
+	}
+
+	// Validate cron expression using parser
+	if _, err := ParseCronExpression(j.Schedule); err != nil {
+		return errors.Wrap(err, "invalid cron expression")
+	}
+
+	if j.Handler == nil {
+		return errors.New("job handler is required")
+	}
+
+	return nil
+}