first commit

store/db/sqlite/activity.go

@@ -0,0 +1,83 @@
+package sqlite
+
+import (
+	"context"
+	"strings"
+
+	"github.com/pkg/errors"
+	"google.golang.org/protobuf/encoding/protojson"
+
+	storepb "github.com/usememos/memos/proto/gen/store"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) CreateActivity(ctx context.Context, create *store.Activity) (*store.Activity, error) {
+	payloadString := "{}"
+	if create.Payload != nil {
+		bytes, err := protojson.Marshal(create.Payload)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to marshal activity payload")
+		}
+		payloadString = string(bytes)
+	}
+
+	fields := []string{"`creator_id`", "`type`", "`level`", "`payload`"}
+	placeholder := []string{"?", "?", "?", "?"}
+	args := []any{create.CreatorID, create.Type.String(), create.Level.String(), payloadString}
+
+	stmt := "INSERT INTO activity (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ") RETURNING `id`, `created_ts`"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(
+		&create.ID,
+		&create.CreatedTs,
+	); err != nil {
+		return nil, err
+	}
+
+	return create, nil
+}
+
+func (d *DB) ListActivities(ctx context.Context, find *store.FindActivity) ([]*store.Activity, error) {
+	where, args := []string{"1 = 1"}, []any{}
+	if find.ID != nil {
+		where, args = append(where, "`id` = ?"), append(args, *find.ID)
+	}
+	if find.Type != nil {
+		where, args = append(where, "`type` = ?"), append(args, find.Type.String())
+	}
+
+	query := "SELECT `id`, `creator_id`, `type`, `level`, `payload`, `created_ts` FROM `activity` WHERE " + strings.Join(where, " AND ") + " ORDER BY `created_ts` DESC"
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := []*store.Activity{}
+	for rows.Next() {
+		activity := &store.Activity{}
+		var payloadBytes []byte
+		if err := rows.Scan(
+			&activity.ID,
+			&activity.CreatorID,
+			&activity.Type,
+			&activity.Level,
+			&payloadBytes,
+			&activity.CreatedTs,
+		); err != nil {
+			return nil, err
+		}
+
+		payload := &storepb.ActivityPayload{}
+		if err := protojsonUnmarshaler.Unmarshal(payloadBytes, payload); err != nil {
+			return nil, err
+		}
+		activity.Payload = payload
+		list = append(list, activity)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}

store/db/sqlite/attachment.go

@@ -0,0 +1,221 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+	"google.golang.org/protobuf/encoding/protojson"
+
+	"github.com/usememos/memos/plugin/filter"
+	storepb "github.com/usememos/memos/proto/gen/store"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) CreateAttachment(ctx context.Context, create *store.Attachment) (*store.Attachment, error) {
+	fields := []string{"`uid`", "`filename`", "`blob`", "`type`", "`size`", "`creator_id`", "`memo_id`", "`storage_type`", "`reference`", "`payload`"}
+	placeholder := []string{"?", "?", "?", "?", "?", "?", "?", "?", "?", "?"}
+	storageType := ""
+	if create.StorageType != storepb.AttachmentStorageType_ATTACHMENT_STORAGE_TYPE_UNSPECIFIED {
+		storageType = create.StorageType.String()
+	}
+	payloadString := "{}"
+	if create.Payload != nil {
+		bytes, err := protojson.Marshal(create.Payload)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to marshal attachment payload")
+		}
+		payloadString = string(bytes)
+	}
+	args := []any{create.UID, create.Filename, create.Blob, create.Type, create.Size, create.CreatorID, create.MemoID, storageType, create.Reference, payloadString}
+
+	stmt := "INSERT INTO `attachment` (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ") RETURNING `id`, `created_ts`, `updated_ts`"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(&create.ID, &create.CreatedTs, &create.UpdatedTs); err != nil {
+		return nil, err
+	}
+
+	return create, nil
+}
+
+func (d *DB) ListAttachments(ctx context.Context, find *store.FindAttachment) ([]*store.Attachment, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	if v := find.ID; v != nil {
+		where, args = append(where, "`attachment`.`id` = ?"), append(args, *v)
+	}
+	if v := find.UID; v != nil {
+		where, args = append(where, "`attachment`.`uid` = ?"), append(args, *v)
+	}
+	if v := find.CreatorID; v != nil {
+		where, args = append(where, "`attachment`.`creator_id` = ?"), append(args, *v)
+	}
+	if v := find.Filename; v != nil {
+		where, args = append(where, "`attachment`.`filename` = ?"), append(args, *v)
+	}
+	if v := find.FilenameSearch; v != nil {
+		where, args = append(where, "`attachment`.`filename` LIKE ?"), append(args, fmt.Sprintf("%%%s%%", *v))
+	}
+	if v := find.MemoID; v != nil {
+		where, args = append(where, "`attachment`.`memo_id` = ?"), append(args, *v)
+	}
+	if len(find.MemoIDList) > 0 {
+		placeholders := make([]string, 0, len(find.MemoIDList))
+		for range find.MemoIDList {
+			placeholders = append(placeholders, "?")
+		}
+		where = append(where, "`attachment`.`memo_id` IN ("+strings.Join(placeholders, ",")+")")
+		for _, id := range find.MemoIDList {
+			args = append(args, id)
+		}
+	}
+	if find.HasRelatedMemo {
+		where = append(where, "`attachment`.`memo_id` IS NOT NULL")
+	}
+	if find.StorageType != nil {
+		where, args = append(where, "`attachment`.`storage_type` = ?"), append(args, find.StorageType.String())
+	}
+
+	if len(find.Filters) > 0 {
+		engine, err := filter.DefaultAttachmentEngine()
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to get filter engine")
+		}
+		if err := filter.AppendConditions(ctx, engine, find.Filters, filter.DialectSQLite, &where, &args); err != nil {
+			return nil, errors.Wrap(err, "failed to append filter conditions")
+		}
+	}
+
+	fields := []string{
+		"`attachment`.`id` AS `id`",
+		"`attachment`.`uid` AS `uid`",
+		"`attachment`.`filename` AS `filename`",
+		"`attachment`.`type` AS `type`",
+		"`attachment`.`size` AS `size`",
+		"`attachment`.`creator_id` AS `creator_id`",
+		"`attachment`.`created_ts` AS `created_ts`",
+		"`attachment`.`updated_ts` AS `updated_ts`",
+		"`attachment`.`memo_id` AS `memo_id`",
+		"`attachment`.`storage_type` AS `storage_type`",
+		"`attachment`.`reference` AS `reference`",
+		"`attachment`.`payload` AS `payload`",
+		"CASE WHEN `memo`.`uid` IS NOT NULL THEN `memo`.`uid` ELSE NULL END AS `memo_uid`",
+	}
+	if find.GetBlob {
+		fields = append(fields, "`attachment`.`blob` AS `blob`")
+	}
+
+	query := "SELECT " + strings.Join(fields, ", ") + " FROM `attachment`" + " " +
+		"LEFT JOIN `memo` ON `attachment`.`memo_id` = `memo`.`id`" + " " +
+		"WHERE " + strings.Join(where, " AND ") + " " +
+		"ORDER BY `attachment`.`updated_ts` DESC"
+	if find.Limit != nil {
+		query = fmt.Sprintf("%s LIMIT %d", query, *find.Limit)
+		if find.Offset != nil {
+			query = fmt.Sprintf("%s OFFSET %d", query, *find.Offset)
+		}
+	}
+
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := make([]*store.Attachment, 0)
+	for rows.Next() {
+		attachment := store.Attachment{}
+		var memoID sql.NullInt32
+		var storageType string
+		var payloadBytes []byte
+		dests := []any{
+			&attachment.ID,
+			&attachment.UID,
+			&attachment.Filename,
+			&attachment.Type,
+			&attachment.Size,
+			&attachment.CreatorID,
+			&attachment.CreatedTs,
+			&attachment.UpdatedTs,
+			&memoID,
+			&storageType,
+			&attachment.Reference,
+			&payloadBytes,
+			&attachment.MemoUID,
+		}
+		if find.GetBlob {
+			dests = append(dests, &attachment.Blob)
+		}
+		if err := rows.Scan(dests...); err != nil {
+			return nil, err
+		}
+
+		if memoID.Valid {
+			attachment.MemoID = &memoID.Int32
+		}
+		attachment.StorageType = storepb.AttachmentStorageType(storepb.AttachmentStorageType_value[storageType])
+		payload := &storepb.AttachmentPayload{}
+		if err := protojsonUnmarshaler.Unmarshal(payloadBytes, payload); err != nil {
+			return nil, err
+		}
+		attachment.Payload = payload
+		list = append(list, &attachment)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) UpdateAttachment(ctx context.Context, update *store.UpdateAttachment) error {
+	set, args := []string{}, []any{}
+
+	if v := update.UID; v != nil {
+		set, args = append(set, "`uid` = ?"), append(args, *v)
+	}
+	if v := update.UpdatedTs; v != nil {
+		set, args = append(set, "`updated_ts` = ?"), append(args, *v)
+	}
+	if v := update.Filename; v != nil {
+		set, args = append(set, "`filename` = ?"), append(args, *v)
+	}
+	if v := update.MemoID; v != nil {
+		set, args = append(set, "`memo_id` = ?"), append(args, *v)
+	}
+	if v := update.Reference; v != nil {
+		set, args = append(set, "`reference` = ?"), append(args, *v)
+	}
+	if v := update.Payload; v != nil {
+		bytes, err := protojson.Marshal(v)
+		if err != nil {
+			return errors.Wrap(err, "failed to marshal attachment payload")
+		}
+		set, args = append(set, "`payload` = ?"), append(args, string(bytes))
+	}
+
+	args = append(args, update.ID)
+	stmt := "UPDATE `attachment` SET " + strings.Join(set, ", ") + " WHERE `id` = ?"
+	result, err := d.db.ExecContext(ctx, stmt, args...)
+	if err != nil {
+		return errors.Wrap(err, "failed to update attachment")
+	}
+	if _, err := result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *DB) DeleteAttachment(ctx context.Context, delete *store.DeleteAttachment) error {
+	stmt := "DELETE FROM `attachment` WHERE `id` = ?"
+	result, err := d.db.ExecContext(ctx, stmt, delete.ID)
+	if err != nil {
+		return err
+	}
+	if _, err := result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}

store/db/sqlite/common.go

@@ -0,0 +1,9 @@
+package sqlite
+
+import "google.golang.org/protobuf/encoding/protojson"
+
+var (
+	protojsonUnmarshaler = protojson.UnmarshalOptions{
+		DiscardUnknown: true,
+	}
+)

store/db/sqlite/functions.go

@@ -0,0 +1,44 @@
+// Package sqlite provides SQLite driver implementation with custom functions.
+// Custom functions are registered globally on first use to extend SQLite's
+// limited ASCII-only text operations with proper Unicode support.
+package sqlite
+
+import (
+	"database/sql/driver"
+	"sync"
+
+	"golang.org/x/text/cases"
+	msqlite "modernc.org/sqlite"
+)
+
+var (
+	registerUnicodeLowerOnce sync.Once
+	registerUnicodeLowerErr  error
+	// unicodeFold provides Unicode case folding for case-insensitive comparisons.
+	// It's safe to use concurrently and reused across all function calls.
+	unicodeFold = cases.Fold()
+)
+
+// ensureUnicodeLowerRegistered registers the memos_unicode_lower custom function
+// with SQLite. This function provides proper Unicode case folding for case-insensitive
+// text comparisons, overcoming modernc.org/sqlite's lack of ICU extension.
+//
+// The function is registered once globally and is safe to call multiple times.
+func ensureUnicodeLowerRegistered() error {
+	registerUnicodeLowerOnce.Do(func() {
+		registerUnicodeLowerErr = msqlite.RegisterScalarFunction("memos_unicode_lower", 1, func(_ *msqlite.FunctionContext, args []driver.Value) (driver.Value, error) {
+			if len(args) == 0 || args[0] == nil {
+				return nil, nil
+			}
+			switch v := args[0].(type) {
+			case string:
+				return unicodeFold.String(v), nil
+			case []byte:
+				return unicodeFold.String(string(v)), nil
+			default:
+				return v, nil
+			}
+		})
+	})
+	return registerUnicodeLowerErr
+}

store/db/sqlite/idp.go

@@ -0,0 +1,117 @@
+package sqlite
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	storepb "github.com/usememos/memos/proto/gen/store"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) CreateIdentityProvider(ctx context.Context, create *store.IdentityProvider) (*store.IdentityProvider, error) {
+	placeholders := []string{"?", "?", "?", "?"}
+	fields := []string{"`name`", "`type`", "`identifier_filter`", "`config`"}
+	args := []any{create.Name, create.Type.String(), create.IdentifierFilter, create.Config}
+
+	stmt := "INSERT INTO `idp` (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholders, ", ") + ") RETURNING `id`"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(&create.ID); err != nil {
+		return nil, err
+	}
+
+	identityProvider := create
+	return identityProvider, nil
+}
+
+func (d *DB) ListIdentityProviders(ctx context.Context, find *store.FindIdentityProvider) ([]*store.IdentityProvider, error) {
+	where, args := []string{"1 = 1"}, []any{}
+	if v := find.ID; v != nil {
+		where, args = append(where, fmt.Sprintf("id = $%d", len(args)+1)), append(args, *v)
+	}
+
+	rows, err := d.db.QueryContext(ctx, `
+		SELECT
+			id,
+			name,
+			type,
+			identifier_filter,
+			config
+		FROM idp
+		WHERE `+strings.Join(where, " AND ")+` ORDER BY id ASC`,
+		args...,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var identityProviders []*store.IdentityProvider
+	for rows.Next() {
+		var identityProvider store.IdentityProvider
+		var typeString string
+		if err := rows.Scan(
+			&identityProvider.ID,
+			&identityProvider.Name,
+			&typeString,
+			&identityProvider.IdentifierFilter,
+			&identityProvider.Config,
+		); err != nil {
+			return nil, err
+		}
+		identityProvider.Type = storepb.IdentityProvider_Type(storepb.IdentityProvider_Type_value[typeString])
+		identityProviders = append(identityProviders, &identityProvider)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return identityProviders, nil
+}
+
+func (d *DB) UpdateIdentityProvider(ctx context.Context, update *store.UpdateIdentityProvider) (*store.IdentityProvider, error) {
+	set, args := []string{}, []any{}
+	if v := update.Name; v != nil {
+		set, args = append(set, "name = ?"), append(args, *v)
+	}
+	if v := update.IdentifierFilter; v != nil {
+		set, args = append(set, "identifier_filter = ?"), append(args, *v)
+	}
+	if v := update.Config; v != nil {
+		set, args = append(set, "config = ?"), append(args, *v)
+	}
+	args = append(args, update.ID)
+
+	stmt := `
+		UPDATE idp
+		SET ` + strings.Join(set, ", ") + `
+		WHERE id = ?
+		RETURNING id, name, type, identifier_filter, config
+	`
+	var identityProvider store.IdentityProvider
+	var typeString string
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(
+		&identityProvider.ID,
+		&identityProvider.Name,
+		&typeString,
+		&identityProvider.IdentifierFilter,
+		&identityProvider.Config,
+	); err != nil {
+		return nil, err
+	}
+	identityProvider.Type = storepb.IdentityProvider_Type(storepb.IdentityProvider_Type_value[typeString])
+	return &identityProvider, nil
+}
+
+func (d *DB) DeleteIdentityProvider(ctx context.Context, delete *store.DeleteIdentityProvider) error {
+	where, args := []string{"id = ?"}, []any{delete.ID}
+	stmt := `DELETE FROM idp WHERE ` + strings.Join(where, " AND ")
+	result, err := d.db.ExecContext(ctx, stmt, args...)
+	if err != nil {
+		return err
+	}
+	if _, err = result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}

store/db/sqlite/inbox.go

@@ -0,0 +1,141 @@
+package sqlite
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+	"google.golang.org/protobuf/encoding/protojson"
+
+	storepb "github.com/usememos/memos/proto/gen/store"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) CreateInbox(ctx context.Context, create *store.Inbox) (*store.Inbox, error) {
+	messageString := "{}"
+	if create.Message != nil {
+		bytes, err := protojson.Marshal(create.Message)
+		if err != nil {
+			return nil, errors.Wrap(err, "failed to marshal inbox message")
+		}
+		messageString = string(bytes)
+	}
+
+	fields := []string{"`sender_id`", "`receiver_id`", "`status`", "`message`"}
+	placeholder := []string{"?", "?", "?", "?"}
+	args := []any{create.SenderID, create.ReceiverID, create.Status, messageString}
+
+	stmt := "INSERT INTO `inbox` (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ") RETURNING `id`, `created_ts`"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(
+		&create.ID,
+		&create.CreatedTs,
+	); err != nil {
+		return nil, err
+	}
+
+	return create, nil
+}
+
+func (d *DB) ListInboxes(ctx context.Context, find *store.FindInbox) ([]*store.Inbox, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	if find.ID != nil {
+		where, args = append(where, "`id` = ?"), append(args, *find.ID)
+	}
+	if find.SenderID != nil {
+		where, args = append(where, "`sender_id` = ?"), append(args, *find.SenderID)
+	}
+	if find.ReceiverID != nil {
+		where, args = append(where, "`receiver_id` = ?"), append(args, *find.ReceiverID)
+	}
+	if find.Status != nil {
+		where, args = append(where, "`status` = ?"), append(args, *find.Status)
+	}
+	if find.MessageType != nil {
+		// Filter by message type using JSON extraction
+		// Note: The type field in JSON is stored as string representation of the enum name
+		if *find.MessageType == storepb.InboxMessage_TYPE_UNSPECIFIED {
+			where, args = append(where, "(JSON_EXTRACT(`message`, '$.type') IS NULL OR JSON_EXTRACT(`message`, '$.type') = ?)"), append(args, find.MessageType.String())
+		} else {
+			where, args = append(where, "JSON_EXTRACT(`message`, '$.type') = ?"), append(args, find.MessageType.String())
+		}
+	}
+
+	query := "SELECT `id`, `created_ts`, `sender_id`, `receiver_id`, `status`, `message` FROM `inbox` WHERE " + strings.Join(where, " AND ") + " ORDER BY `created_ts` DESC"
+	if find.Limit != nil {
+		query = fmt.Sprintf("%s LIMIT %d", query, *find.Limit)
+		if find.Offset != nil {
+			query = fmt.Sprintf("%s OFFSET %d", query, *find.Offset)
+		}
+	}
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := []*store.Inbox{}
+	for rows.Next() {
+		inbox := &store.Inbox{}
+		var messageBytes []byte
+		if err := rows.Scan(
+			&inbox.ID,
+			&inbox.CreatedTs,
+			&inbox.SenderID,
+			&inbox.ReceiverID,
+			&inbox.Status,
+			&messageBytes,
+		); err != nil {
+			return nil, err
+		}
+
+		message := &storepb.InboxMessage{}
+		if err := protojsonUnmarshaler.Unmarshal(messageBytes, message); err != nil {
+			return nil, err
+		}
+		inbox.Message = message
+		list = append(list, inbox)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) UpdateInbox(ctx context.Context, update *store.UpdateInbox) (*store.Inbox, error) {
+	set, args := []string{"`status` = ?"}, []any{update.Status.String()}
+	args = append(args, update.ID)
+	query := "UPDATE `inbox` SET " + strings.Join(set, ", ") + " WHERE `id` = ? RETURNING `id`, `created_ts`, `sender_id`, `receiver_id`, `status`, `message`"
+	inbox := &store.Inbox{}
+	var messageBytes []byte
+	if err := d.db.QueryRowContext(ctx, query, args...).Scan(
+		&inbox.ID,
+		&inbox.CreatedTs,
+		&inbox.SenderID,
+		&inbox.ReceiverID,
+		&inbox.Status,
+		&messageBytes,
+	); err != nil {
+		return nil, err
+	}
+	message := &storepb.InboxMessage{}
+	if err := protojsonUnmarshaler.Unmarshal(messageBytes, message); err != nil {
+		return nil, err
+	}
+	inbox.Message = message
+	return inbox, nil
+}
+
+func (d *DB) DeleteInbox(ctx context.Context, delete *store.DeleteInbox) error {
+	result, err := d.db.ExecContext(ctx, "DELETE FROM `inbox` WHERE `id` = ?", delete.ID)
+	if err != nil {
+		return err
+	}
+	if _, err := result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}

store/db/sqlite/instance_setting.go

@@ -0,0 +1,72 @@
+package sqlite
+
+import (
+	"context"
+	"strings"
+
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) UpsertInstanceSetting(ctx context.Context, upsert *store.InstanceSetting) (*store.InstanceSetting, error) {
+	stmt := `
+		INSERT INTO system_setting (
+			name, value, description
+		)
+		VALUES (?, ?, ?)
+		ON CONFLICT(name) DO UPDATE
+		SET
+			value = EXCLUDED.value,
+			description = EXCLUDED.description
+	`
+	if _, err := d.db.ExecContext(ctx, stmt, upsert.Name, upsert.Value, upsert.Description); err != nil {
+		return nil, err
+	}
+
+	return upsert, nil
+}
+
+func (d *DB) ListInstanceSettings(ctx context.Context, find *store.FindInstanceSetting) ([]*store.InstanceSetting, error) {
+	where, args := []string{"1 = 1"}, []any{}
+	if find.Name != "" {
+		where, args = append(where, "name = ?"), append(args, find.Name)
+	}
+
+	query := `
+		SELECT
+			name,
+			value,
+			description
+		FROM system_setting
+		WHERE ` + strings.Join(where, " AND ")
+
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := []*store.InstanceSetting{}
+	for rows.Next() {
+		systemSettingMessage := &store.InstanceSetting{}
+		if err := rows.Scan(
+			&systemSettingMessage.Name,
+			&systemSettingMessage.Value,
+			&systemSettingMessage.Description,
+		); err != nil {
+			return nil, err
+		}
+		list = append(list, systemSettingMessage)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) DeleteInstanceSetting(ctx context.Context, delete *store.DeleteInstanceSetting) error {
+	stmt := "DELETE FROM system_setting WHERE name = ?"
+	_, err := d.db.ExecContext(ctx, stmt, delete.Name)
+	return err
+}

store/db/sqlite/memo.go

@@ -0,0 +1,247 @@
+package sqlite
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+	"google.golang.org/protobuf/encoding/protojson"
+
+	"github.com/usememos/memos/plugin/filter"
+	storepb "github.com/usememos/memos/proto/gen/store"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) CreateMemo(ctx context.Context, create *store.Memo) (*store.Memo, error) {
+	fields := []string{"`uid`", "`creator_id`", "`content`", "`visibility`", "`payload`"}
+	placeholder := []string{"?", "?", "?", "?", "?"}
+	payload := "{}"
+	if create.Payload != nil {
+		payloadBytes, err := protojson.Marshal(create.Payload)
+		if err != nil {
+			return nil, err
+		}
+		payload = string(payloadBytes)
+	}
+	args := []any{create.UID, create.CreatorID, create.Content, create.Visibility, payload}
+
+	// Add custom timestamps if provided
+	if create.CreatedTs != 0 {
+		fields = append(fields, "`created_ts`")
+		placeholder = append(placeholder, "?")
+		args = append(args, create.CreatedTs)
+	}
+	if create.UpdatedTs != 0 {
+		fields = append(fields, "`updated_ts`")
+		placeholder = append(placeholder, "?")
+		args = append(args, create.UpdatedTs)
+	}
+
+	stmt := "INSERT INTO `memo` (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ") RETURNING `id`, `created_ts`, `updated_ts`, `row_status`"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(
+		&create.ID,
+		&create.CreatedTs,
+		&create.UpdatedTs,
+		&create.RowStatus,
+	); err != nil {
+		return nil, err
+	}
+
+	return create, nil
+}
+
+func (d *DB) ListMemos(ctx context.Context, find *store.FindMemo) ([]*store.Memo, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	engine, err := filter.DefaultEngine()
+	if err != nil {
+		return nil, err
+	}
+	if err := filter.AppendConditions(ctx, engine, find.Filters, filter.DialectSQLite, &where, &args); err != nil {
+		return nil, err
+	}
+	if v := find.ID; v != nil {
+		where, args = append(where, "`memo`.`id` = ?"), append(args, *v)
+	}
+	if len(find.IDList) > 0 {
+		placeholders := make([]string, 0, len(find.IDList))
+		for range find.IDList {
+			placeholders = append(placeholders, "?")
+		}
+		where = append(where, "`memo`.`id` IN ("+strings.Join(placeholders, ",")+")")
+		for _, id := range find.IDList {
+			args = append(args, id)
+		}
+	}
+	if v := find.UID; v != nil {
+		where, args = append(where, "`memo`.`uid` = ?"), append(args, *v)
+	}
+	if len(find.UIDList) > 0 {
+		placeholders := make([]string, 0, len(find.UIDList))
+		for range find.UIDList {
+			placeholders = append(placeholders, "?")
+		}
+		where = append(where, "`memo`.`uid` IN ("+strings.Join(placeholders, ",")+")")
+		for _, uid := range find.UIDList {
+			args = append(args, uid)
+		}
+	}
+	if v := find.CreatorID; v != nil {
+		where, args = append(where, "`memo`.`creator_id` = ?"), append(args, *v)
+	}
+	if v := find.RowStatus; v != nil {
+		where, args = append(where, "`memo`.`row_status` = ?"), append(args, *v)
+	}
+	if v := find.VisibilityList; len(v) != 0 {
+		placeholder := []string{}
+		for _, visibility := range v {
+			placeholder = append(placeholder, "?")
+			args = append(args, visibility.String())
+		}
+		where = append(where, fmt.Sprintf("`memo`.`visibility` IN (%s)", strings.Join(placeholder, ",")))
+	}
+	if find.ExcludeComments {
+		where = append(where, "`parent_uid` IS NULL")
+	}
+
+	order := "DESC"
+	if find.OrderByTimeAsc {
+		order = "ASC"
+	}
+	orderBy := []string{}
+	if find.OrderByPinned {
+		orderBy = append(orderBy, "`pinned` DESC")
+	}
+	if find.OrderByUpdatedTs {
+		orderBy = append(orderBy, "`updated_ts` "+order)
+	} else {
+		orderBy = append(orderBy, "`created_ts` "+order)
+	}
+	// Add id as final tie-breaker
+	orderBy = append(orderBy, "`id` DESC")
+	fields := []string{
+		"`memo`.`id` AS `id`",
+		"`memo`.`uid` AS `uid`",
+		"`memo`.`creator_id` AS `creator_id`",
+		"`memo`.`created_ts` AS `created_ts`",
+		"`memo`.`updated_ts` AS `updated_ts`",
+		"`memo`.`row_status` AS `row_status`",
+		"`memo`.`visibility` AS `visibility`",
+		"`memo`.`pinned` AS `pinned`",
+		"`memo`.`payload` AS `payload`",
+		"CASE WHEN `parent_memo`.`uid` IS NOT NULL THEN `parent_memo`.`uid` ELSE NULL END AS `parent_uid`",
+	}
+	if !find.ExcludeContent {
+		fields = append(fields, "`memo`.`content` AS `content`")
+	}
+
+	query := "SELECT " + strings.Join(fields, ", ") + "FROM `memo` " +
+		"LEFT JOIN `memo_relation` ON `memo`.`id` = `memo_relation`.`memo_id` AND `memo_relation`.`type` = \"COMMENT\" " +
+		"LEFT JOIN `memo` AS `parent_memo` ON `memo_relation`.`related_memo_id` = `parent_memo`.`id` " +
+		"WHERE " + strings.Join(where, " AND ") + " " +
+		"ORDER BY " + strings.Join(orderBy, ", ")
+	if find.Limit != nil {
+		query = fmt.Sprintf("%s LIMIT %d", query, *find.Limit)
+		if find.Offset != nil {
+			query = fmt.Sprintf("%s OFFSET %d", query, *find.Offset)
+		}
+	}
+
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := make([]*store.Memo, 0)
+	for rows.Next() {
+		var memo store.Memo
+		var payloadBytes []byte
+		dests := []any{
+			&memo.ID,
+			&memo.UID,
+			&memo.CreatorID,
+			&memo.CreatedTs,
+			&memo.UpdatedTs,
+			&memo.RowStatus,
+			&memo.Visibility,
+			&memo.Pinned,
+			&payloadBytes,
+			&memo.ParentUID,
+		}
+		if !find.ExcludeContent {
+			dests = append(dests, &memo.Content)
+		}
+		if err := rows.Scan(dests...); err != nil {
+			return nil, err
+		}
+		payload := &storepb.MemoPayload{}
+		if err := protojsonUnmarshaler.Unmarshal(payloadBytes, payload); err != nil {
+			return nil, errors.Wrap(err, "failed to unmarshal payload")
+		}
+		memo.Payload = payload
+		list = append(list, &memo)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) UpdateMemo(ctx context.Context, update *store.UpdateMemo) error {
+	set, args := []string{}, []any{}
+	if v := update.UID; v != nil {
+		set, args = append(set, "`uid` = ?"), append(args, *v)
+	}
+	if v := update.CreatedTs; v != nil {
+		set, args = append(set, "`created_ts` = ?"), append(args, *v)
+	}
+	if v := update.UpdatedTs; v != nil {
+		set, args = append(set, "`updated_ts` = ?"), append(args, *v)
+	}
+	if v := update.RowStatus; v != nil {
+		set, args = append(set, "`row_status` = ?"), append(args, *v)
+	}
+	if v := update.Content; v != nil {
+		set, args = append(set, "`content` = ?"), append(args, *v)
+	}
+	if v := update.Visibility; v != nil {
+		set, args = append(set, "`visibility` = ?"), append(args, *v)
+	}
+	if v := update.Pinned; v != nil {
+		set, args = append(set, "`pinned` = ?"), append(args, *v)
+	}
+	if v := update.Payload; v != nil {
+		payloadBytes, err := protojson.Marshal(v)
+		if err != nil {
+			return err
+		}
+		set, args = append(set, "`payload` = ?"), append(args, string(payloadBytes))
+	}
+	if len(set) == 0 {
+		return nil
+	}
+	args = append(args, update.ID)
+
+	stmt := "UPDATE `memo` SET " + strings.Join(set, ", ") + " WHERE `id` = ?"
+	if _, err := d.db.ExecContext(ctx, stmt, args...); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *DB) DeleteMemo(ctx context.Context, delete *store.DeleteMemo) error {
+	where, args := []string{"`id` = ?"}, []any{delete.ID}
+	stmt := "DELETE FROM `memo` WHERE " + strings.Join(where, " AND ")
+	result, err := d.db.ExecContext(ctx, stmt, args...)
+	if err != nil {
+		return err
+	}
+	if _, err := result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}

store/db/sqlite/memo_relation.go

@@ -0,0 +1,122 @@
+package sqlite
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/usememos/memos/plugin/filter"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) UpsertMemoRelation(ctx context.Context, create *store.MemoRelation) (*store.MemoRelation, error) {
+	stmt := `
+		INSERT INTO memo_relation (
+			memo_id,
+			related_memo_id,
+			type
+		)
+		VALUES (?, ?, ?)
+		ON CONFLICT(memo_id, related_memo_id, type) DO UPDATE SET type = excluded.type
+		RETURNING memo_id, related_memo_id, type
+	`
+	memoRelation := &store.MemoRelation{}
+	if err := d.db.QueryRowContext(
+		ctx,
+		stmt,
+		create.MemoID,
+		create.RelatedMemoID,
+		create.Type,
+	).Scan(
+		&memoRelation.MemoID,
+		&memoRelation.RelatedMemoID,
+		&memoRelation.Type,
+	); err != nil {
+		return nil, err
+	}
+
+	return memoRelation, nil
+}
+
+func (d *DB) ListMemoRelations(ctx context.Context, find *store.FindMemoRelation) ([]*store.MemoRelation, error) {
+	where, args := []string{"TRUE"}, []any{}
+	if find.MemoID != nil {
+		where, args = append(where, "memo_id = ?"), append(args, find.MemoID)
+	}
+	if find.RelatedMemoID != nil {
+		where, args = append(where, "related_memo_id = ?"), append(args, find.RelatedMemoID)
+	}
+	if find.Type != nil {
+		where, args = append(where, "type = ?"), append(args, find.Type)
+	}
+	if find.MemoFilter != nil {
+		engine, err := filter.DefaultEngine()
+		if err != nil {
+			return nil, err
+		}
+		stmt, err := engine.CompileToStatement(ctx, *find.MemoFilter, filter.RenderOptions{Dialect: filter.DialectSQLite})
+		if err != nil {
+			return nil, err
+		}
+		if stmt.SQL != "" {
+			where = append(where, fmt.Sprintf("memo_id IN (SELECT id FROM memo WHERE %s)", stmt.SQL))
+			where = append(where, fmt.Sprintf("related_memo_id IN (SELECT id FROM memo WHERE %s)", stmt.SQL))
+			args = append(args, append(stmt.Args, stmt.Args...)...)
+		}
+	}
+
+	rows, err := d.db.QueryContext(ctx, `
+		SELECT
+			memo_id,
+			related_memo_id,
+			type
+		FROM memo_relation
+		WHERE `+strings.Join(where, " AND "), args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := []*store.MemoRelation{}
+	for rows.Next() {
+		memoRelation := &store.MemoRelation{}
+		if err := rows.Scan(
+			&memoRelation.MemoID,
+			&memoRelation.RelatedMemoID,
+			&memoRelation.Type,
+		); err != nil {
+			return nil, err
+		}
+		list = append(list, memoRelation)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) DeleteMemoRelation(ctx context.Context, delete *store.DeleteMemoRelation) error {
+	where, args := []string{"TRUE"}, []any{}
+	if delete.MemoID != nil {
+		where, args = append(where, "memo_id = ?"), append(args, delete.MemoID)
+	}
+	if delete.RelatedMemoID != nil {
+		where, args = append(where, "related_memo_id = ?"), append(args, delete.RelatedMemoID)
+	}
+	if delete.Type != nil {
+		where, args = append(where, "type = ?"), append(args, delete.Type)
+	}
+	stmt := `
+		DELETE FROM memo_relation
+		WHERE ` + strings.Join(where, " AND ")
+	result, err := d.db.ExecContext(ctx, stmt, args...)
+	if err != nil {
+		return err
+	}
+	if _, err = result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}

store/db/sqlite/reaction.go

@@ -0,0 +1,136 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"strings"
+
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) UpsertReaction(ctx context.Context, upsert *store.Reaction) (*store.Reaction, error) {
+	fields := []string{"`creator_id`", "`content_id`", "`reaction_type`"}
+	placeholder := []string{"?", "?", "?"}
+	args := []interface{}{upsert.CreatorID, upsert.ContentID, upsert.ReactionType}
+	stmt := "INSERT INTO `reaction` (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ") RETURNING `id`, `created_ts`"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(
+		&upsert.ID,
+		&upsert.CreatedTs,
+	); err != nil {
+		return nil, err
+	}
+
+	reaction := upsert
+	return reaction, nil
+}
+
+func (d *DB) ListReactions(ctx context.Context, find *store.FindReaction) ([]*store.Reaction, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	if find.ID != nil {
+		where, args = append(where, "id = ?"), append(args, *find.ID)
+	}
+	if find.CreatorID != nil {
+		where, args = append(where, "creator_id = ?"), append(args, *find.CreatorID)
+	}
+	if find.ContentID != nil {
+		where, args = append(where, "content_id = ?"), append(args, *find.ContentID)
+	}
+	if len(find.ContentIDList) > 0 {
+		placeholders := make([]string, 0, len(find.ContentIDList))
+		for range find.ContentIDList {
+			placeholders = append(placeholders, "?")
+		}
+		if len(placeholders) > 0 {
+			where = append(where, "content_id IN ("+strings.Join(placeholders, ",")+")")
+			for _, id := range find.ContentIDList {
+				args = append(args, id)
+			}
+		}
+	}
+
+	rows, err := d.db.QueryContext(ctx, `
+		SELECT
+			id,
+			created_ts,
+			creator_id,
+			content_id,
+			reaction_type
+		FROM reaction
+		WHERE `+strings.Join(where, " AND ")+`
+		ORDER BY id ASC`,
+		args...,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := []*store.Reaction{}
+	for rows.Next() {
+		reaction := &store.Reaction{}
+		if err := rows.Scan(
+			&reaction.ID,
+			&reaction.CreatedTs,
+			&reaction.CreatorID,
+			&reaction.ContentID,
+			&reaction.ReactionType,
+		); err != nil {
+			return nil, err
+		}
+		list = append(list, reaction)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) GetReaction(ctx context.Context, find *store.FindReaction) (*store.Reaction, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	if find.ID != nil {
+		where, args = append(where, "id = ?"), append(args, *find.ID)
+	}
+	if find.CreatorID != nil {
+		where, args = append(where, "creator_id = ?"), append(args, *find.CreatorID)
+	}
+	if find.ContentID != nil {
+		where, args = append(where, "content_id = ?"), append(args, *find.ContentID)
+	}
+
+	reaction := &store.Reaction{}
+	if err := d.db.QueryRowContext(ctx, `
+		SELECT
+			id,
+			created_ts,
+			creator_id,
+			content_id,
+			reaction_type
+		FROM reaction
+		WHERE `+strings.Join(where, " AND ")+`
+		LIMIT 1`,
+		args...,
+	).Scan(
+		&reaction.ID,
+		&reaction.CreatedTs,
+		&reaction.CreatorID,
+		&reaction.ContentID,
+		&reaction.ReactionType,
+	); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return reaction, nil
+}
+
+func (d *DB) DeleteReaction(ctx context.Context, delete *store.DeleteReaction) error {
+	_, err := d.db.ExecContext(ctx, "DELETE FROM `reaction` WHERE `id` = ?", delete.ID)
+	return err
+}

store/db/sqlite/sqlite.go

@@ -0,0 +1,75 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/pkg/errors"
+
+	// Note: modernc.org/sqlite driver is imported in functions.go where
+	// RegisterScalarFunction is used. No blank import needed here.
+
+	"github.com/usememos/memos/internal/profile"
+	"github.com/usememos/memos/store"
+)
+
+type DB struct {
+	db      *sql.DB
+	profile *profile.Profile
+}
+
+// NewDB opens a database specified by its database driver name and a
+// driver-specific data source name, usually consisting of at least a
+// database name and connection information.
+func NewDB(profile *profile.Profile) (store.Driver, error) {
+	// Ensure a DSN is set before attempting to open the database.
+	if profile.DSN == "" {
+		return nil, errors.New("dsn required")
+	}
+
+	if err := ensureUnicodeLowerRegistered(); err != nil {
+		return nil, errors.Wrap(err, "failed to register sqlite unicode lower function")
+	}
+
+	// Connect to the database with some sane settings:
+	// - No shared-cache: it's obsolete; WAL journal mode is a better solution.
+	// - No foreign key constraints: it's currently disabled by default, but it's a
+	// good practice to be explicit and prevent future surprises on SQLite upgrades.
+	// - Journal mode set to WAL: it's the recommended journal mode for most applications
+	// as it prevents locking issues.
+	// - mmap size set to 0: it disables memory mapping, which can cause OOM errors on some systems.
+	//
+	// Notes:
+	// - When using the `modernc.org/sqlite` driver, each pragma must be prefixed with `_pragma=`.
+	//
+	// References:
+	// - https://pkg.go.dev/modernc.org/sqlite#Driver.Open
+	// - https://www.sqlite.org/sharedcache.html
+	// - https://www.sqlite.org/pragma.html
+	sqliteDB, err := sql.Open("sqlite", profile.DSN+"?_pragma=foreign_keys(0)&_pragma=busy_timeout(10000)&_pragma=journal_mode(WAL)&_pragma=mmap_size(0)")
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to open db with dsn: %s", profile.DSN)
+	}
+
+	driver := DB{db: sqliteDB, profile: profile}
+
+	return &driver, nil
+}
+
+func (d *DB) GetDB() *sql.DB {
+	return d.db
+}
+
+func (d *DB) Close() error {
+	return d.db.Close()
+}
+
+func (d *DB) IsInitialized(ctx context.Context) (bool, error) {
+	// Check if the database is initialized by checking if the memo table exists.
+	var exists bool
+	err := d.db.QueryRowContext(ctx, "SELECT EXISTS(SELECT 1 FROM sqlite_master WHERE type='table' AND name='memo')").Scan(&exists)
+	if err != nil {
+		return false, errors.Wrap(err, "failed to check if database is initialized")
+	}
+	return exists, nil
+}

store/db/sqlite/user.go

@@ -0,0 +1,176 @@
+package sqlite
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) CreateUser(ctx context.Context, create *store.User) (*store.User, error) {
+	fields := []string{"`username`", "`role`", "`email`", "`nickname`", "`password_hash`, `avatar_url`"}
+	placeholder := []string{"?", "?", "?", "?", "?", "?"}
+	args := []any{create.Username, create.Role, create.Email, create.Nickname, create.PasswordHash, create.AvatarURL}
+	stmt := "INSERT INTO user (" + strings.Join(fields, ", ") + ") VALUES (" + strings.Join(placeholder, ", ") + ") RETURNING id, description, created_ts, updated_ts, row_status"
+	if err := d.db.QueryRowContext(ctx, stmt, args...).Scan(
+		&create.ID,
+		&create.Description,
+		&create.CreatedTs,
+		&create.UpdatedTs,
+		&create.RowStatus,
+	); err != nil {
+		return nil, err
+	}
+
+	return create, nil
+}
+
+func (d *DB) UpdateUser(ctx context.Context, update *store.UpdateUser) (*store.User, error) {
+	set, args := []string{}, []any{}
+	if v := update.UpdatedTs; v != nil {
+		set, args = append(set, "updated_ts = ?"), append(args, *v)
+	}
+	if v := update.RowStatus; v != nil {
+		set, args = append(set, "row_status = ?"), append(args, *v)
+	}
+	if v := update.Username; v != nil {
+		set, args = append(set, "username = ?"), append(args, *v)
+	}
+	if v := update.Email; v != nil {
+		set, args = append(set, "email = ?"), append(args, *v)
+	}
+	if v := update.Nickname; v != nil {
+		set, args = append(set, "nickname = ?"), append(args, *v)
+	}
+	if v := update.AvatarURL; v != nil {
+		set, args = append(set, "avatar_url = ?"), append(args, *v)
+	}
+	if v := update.PasswordHash; v != nil {
+		set, args = append(set, "password_hash = ?"), append(args, *v)
+	}
+	if v := update.Description; v != nil {
+		set, args = append(set, "description = ?"), append(args, *v)
+	}
+	if v := update.Role; v != nil {
+		set, args = append(set, "role = ?"), append(args, *v)
+	}
+	args = append(args, update.ID)
+
+	query := `
+		UPDATE user
+		SET ` + strings.Join(set, ", ") + `
+		WHERE id = ?
+		RETURNING id, username, role, email, nickname, password_hash, avatar_url, description, created_ts, updated_ts, row_status
+	`
+	user := &store.User{}
+	if err := d.db.QueryRowContext(ctx, query, args...).Scan(
+		&user.ID,
+		&user.Username,
+		&user.Role,
+		&user.Email,
+		&user.Nickname,
+		&user.PasswordHash,
+		&user.AvatarURL,
+		&user.Description,
+		&user.CreatedTs,
+		&user.UpdatedTs,
+		&user.RowStatus,
+	); err != nil {
+		return nil, err
+	}
+
+	return user, nil
+}
+
+func (d *DB) ListUsers(ctx context.Context, find *store.FindUser) ([]*store.User, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	if len(find.Filters) > 0 {
+		return nil, errors.Errorf("user filters are not supported")
+	}
+
+	if v := find.ID; v != nil {
+		where, args = append(where, "id = ?"), append(args, *v)
+	}
+	if v := find.Username; v != nil {
+		where, args = append(where, "username = ?"), append(args, *v)
+	}
+	if v := find.Role; v != nil {
+		where, args = append(where, "role = ?"), append(args, *v)
+	}
+	if v := find.Email; v != nil {
+		where, args = append(where, "email = ?"), append(args, *v)
+	}
+	if v := find.Nickname; v != nil {
+		where, args = append(where, "nickname = ?"), append(args, *v)
+	}
+
+	orderBy := []string{"created_ts DESC", "row_status DESC"}
+	query := `
+		SELECT 
+			id,
+			username,
+			role,
+			email,
+			nickname,
+			password_hash,
+			avatar_url,
+			description,
+			created_ts,
+			updated_ts,
+			row_status
+		FROM user
+		WHERE ` + strings.Join(where, " AND ") + ` ORDER BY ` + strings.Join(orderBy, ", ")
+	if v := find.Limit; v != nil {
+		query += fmt.Sprintf(" LIMIT %d", *v)
+	}
+
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	list := make([]*store.User, 0)
+	for rows.Next() {
+		var user store.User
+		if err := rows.Scan(
+			&user.ID,
+			&user.Username,
+			&user.Role,
+			&user.Email,
+			&user.Nickname,
+			&user.PasswordHash,
+			&user.AvatarURL,
+			&user.Description,
+			&user.CreatedTs,
+			&user.UpdatedTs,
+			&user.RowStatus,
+		); err != nil {
+			return nil, err
+		}
+		list = append(list, &user)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (d *DB) DeleteUser(ctx context.Context, delete *store.DeleteUser) error {
+	result, err := d.db.ExecContext(ctx, `
+		DELETE FROM user WHERE id = ?
+	`, delete.ID)
+	if err != nil {
+		return err
+	}
+	if _, err := result.RowsAffected(); err != nil {
+		return err
+	}
+	return nil
+}

store/db/sqlite/user_setting.go

@@ -0,0 +1,109 @@
+package sqlite
+
+import (
+	"context"
+	"strings"
+
+	"github.com/pkg/errors"
+
+	storepb "github.com/usememos/memos/proto/gen/store"
+	"github.com/usememos/memos/store"
+)
+
+func (d *DB) UpsertUserSetting(ctx context.Context, upsert *store.UserSetting) (*store.UserSetting, error) {
+	stmt := `
+		INSERT INTO user_setting (
+			user_id, key, value
+		)
+		VALUES (?, ?, ?)
+		ON CONFLICT(user_id, key) DO UPDATE 
+		SET value = EXCLUDED.value
+	`
+	if _, err := d.db.ExecContext(ctx, stmt, upsert.UserID, upsert.Key.String(), upsert.Value); err != nil {
+		return nil, err
+	}
+	return upsert, nil
+}
+
+func (d *DB) ListUserSettings(ctx context.Context, find *store.FindUserSetting) ([]*store.UserSetting, error) {
+	where, args := []string{"1 = 1"}, []any{}
+
+	if v := find.Key; v != storepb.UserSetting_KEY_UNSPECIFIED {
+		where, args = append(where, "key = ?"), append(args, v.String())
+	}
+	if v := find.UserID; v != nil {
+		where, args = append(where, "user_id = ?"), append(args, *find.UserID)
+	}
+
+	query := `
+		SELECT
+			user_id,
+		  key,
+			value
+		FROM user_setting
+		WHERE ` + strings.Join(where, " AND ")
+	rows, err := d.db.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	userSettingList := make([]*store.UserSetting, 0)
+	for rows.Next() {
+		userSetting := &store.UserSetting{}
+		var keyString string
+		if err := rows.Scan(
+			&userSetting.UserID,
+			&keyString,
+			&userSetting.Value,
+		); err != nil {
+			return nil, err
+		}
+		userSetting.Key = storepb.UserSetting_Key(storepb.UserSetting_Key_value[keyString])
+		userSettingList = append(userSettingList, userSetting)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return userSettingList, nil
+}
+
+func (d *DB) GetUserByPATHash(ctx context.Context, tokenHash string) (*store.PATQueryResult, error) {
+	query := `
+		SELECT
+			user_setting.user_id,
+			user_setting.value
+		FROM user_setting
+		WHERE user_setting.key = 'PERSONAL_ACCESS_TOKENS'
+			AND EXISTS (
+				SELECT 1
+				FROM json_each(json_extract(user_setting.value, '$.tokens')) AS token
+				WHERE json_extract(token.value, '$.tokenHash') = ?
+			)
+	`
+
+	var userID int32
+	var tokensJSON string
+
+	err := d.db.QueryRowContext(ctx, query, tokenHash).Scan(&userID, &tokensJSON)
+	if err != nil {
+		return nil, err
+	}
+
+	patsUserSetting := &storepb.PersonalAccessTokensUserSetting{}
+	if err := protojsonUnmarshaler.Unmarshal([]byte(tokensJSON), patsUserSetting); err != nil {
+		return nil, err
+	}
+
+	for _, pat := range patsUserSetting.Tokens {
+		if pat.TokenHash == tokenHash {
+			return &store.PATQueryResult{
+				UserID: userID,
+				PAT:    pat,
+			}, nil
+		}
+	}
+
+	return nil, errors.New("PAT not found")
+}