✨ Use SQLite instead of JSON storage

internal/models/config.go

@@ -135,7 +135,7 @@ func NewDefaultAppConfig() *AppConfig {
 			TabSize:         4,
 			TabType:         TabTypeSpaces,
 			// 保存选项
-			AutoSaveDelay: 5000, // 5秒后自动保存
+			AutoSaveDelay: 2000, // 2秒后自动保存
 		},
 		Appearance: AppearanceConfig{
 			Language:    LangZhCN,

internal/models/document.go

@@ -4,38 +4,27 @@ import (
 	"time"
 )
 
-// DocumentMeta 文档元数据
-type DocumentMeta struct {
-	ID          string    `json:"id"`          // 文档唯一标识
-	Title       string    `json:"title"`       // 文档标题
-	LastUpdated time.Time `json:"lastUpdated"` // 最后更新时间
-	CreatedAt   time.Time `json:"createdAt"`   // 创建时间
-}
-
-// Document 表示一个文档
+// Document 表示一个文档（使用自增主键）
 type Document struct {
-	Meta    DocumentMeta `json:"meta"`    // 元数据
-	Content string       `json:"content"` // 文档内容
+	ID        int64     `json:"id" db:"id"`
+	Title     string    `json:"title" db:"title"`
+	Content   string    `json:"content" db:"content"`
+	CreatedAt time.Time `json:"createdAt" db:"created_at"`
+	UpdatedAt time.Time `json:"updatedAt" db:"updated_at"`
 }
 
-// DocumentInfo 文档信息（不包含内容，用于列表展示）
-type DocumentInfo struct {
-	ID          string    `json:"id"`          // 文档ID
-	Title       string    `json:"title"`       // 文档标题
-	LastUpdated time.Time `json:"lastUpdated"` // 最后更新时间
-	Path        string    `json:"path"`        // 文档路径
+// NewDocument 创建新文档（不需要传ID，由数据库自增）
+func NewDocument(title, content string) *Document {
+	now := time.Now()
+	return &Document{
+		Title:     title,
+		Content:   content,
+		CreatedAt: now,
+		UpdatedAt: now,
+	}
 }
 
 // NewDefaultDocument 创建默认文档
 func NewDefaultDocument() *Document {
-	now := time.Now()
-	return &Document{
-		Meta: DocumentMeta{
-			ID:          "default",
-			Title:       "默认文档",
-			LastUpdated: now,
-			CreatedAt:   now,
-		},
-		Content: "∞∞∞text-a\n",
-	}
+	return NewDocument("default", "∞∞∞text-a\n")
 }

internal/services/config_migration_service.go

@@ -132,7 +132,7 @@ func (cms *ConfigMigrationService[T]) checkResourceLimits() error {
 	return nil
 }
 
-// createBackupOptimized 优化的备份创建（单次扫描删除旧备份）
+// createBackupOptimized 优化的备份创建
 func (cms *ConfigMigrationService[T]) createBackupOptimized() (string, error) {
 	if _, err := os.Stat(cms.configPath); os.IsNotExist(err) {
 		return "", nil
@@ -155,7 +155,7 @@ func (cms *ConfigMigrationService[T]) createBackupOptimized() (string, error) {
 	return newBackupPath, copyFile(cms.configPath, newBackupPath)
 }
 
-// tryQuickRecovery 快速恢复检查（避免完整的备份恢复）
+// tryQuickRecovery 快速恢复检查
 func (cms *ConfigMigrationService[T]) tryQuickRecovery(existingConfig *koanf.Koanf) {
 	var testConfig T
 	if existingConfig.Unmarshal("", &testConfig) != nil {
@@ -213,7 +213,7 @@ func (cms *ConfigMigrationService[T]) mergeInPlace(existingConfig *koanf.Koanf,
 		return false, fmt.Errorf("config merge failed: %w", err)
 	}
 
-	// 更新元数据（直接操作，无需重新序列化）
+	// 更新元数据
 	mergeKoanf.Set("metadata.version", cms.targetVersion)
 	mergeKoanf.Set("metadata.lastUpdated", time.Now().Format(time.RFC3339))
 
@@ -249,12 +249,12 @@ func (cms *ConfigMigrationService[T]) atomicWrite(existingConfig *koanf.Koanf, c
 	return existingConfig.Load(&BytesProvider{configBytes}, jsonparser.Parser())
 }
 
-// fastMerge 快速合并函数（优化版本）
+// fastMerge 快速合并函数
 func (cms *ConfigMigrationService[T]) fastMerge(src, dest map[string]interface{}) error {
 	return cms.fastMergeRecursive(src, dest, 0)
 }
 
-// fastMergeRecursive 快速递归合并（单次遍历，最小化反射使用）
+// fastMergeRecursive 快速递归合并
 func (cms *ConfigMigrationService[T]) fastMergeRecursive(src, dest map[string]interface{}, depth int) error {
 	if depth > MaxRecursionDepth {
 		return fmt.Errorf("recursion depth exceeded")

internal/services/config_notification_service.go

@@ -5,6 +5,7 @@ import (
 	"crypto/sha256"
 	"encoding/json"
 	"fmt"
+	"reflect"
 	"sync"
 	"time"
 	"voidraft/internal/models"
@@ -28,6 +29,7 @@ type ConfigChangeCallback func(changeType ConfigChangeType, oldConfig, newConfig
 
 // ConfigListener 配置监听器
 type ConfigListener struct {
+	ID            string                               // 监听器唯一ID
 	Name          string                               // 监听器名称
 	ChangeType    ConfigChangeType                     // 监听的配置变更类型
 	Callback      ConfigChangeCallback                 // 回调函数（现在包含新旧配置）
@@ -45,9 +47,10 @@ type ConfigListener struct {
 
 // ConfigNotificationService 配置通知服务
 type ConfigNotificationService struct {
-	listeners sync.Map           // 使用sync.Map替代普通map+锁
-	logger    *log.LoggerService // 日志服务
-	koanf     *koanf.Koanf       // koanf实例
+	listeners map[ConfigChangeType][]*ConfigListener // 支持多监听器的map
+	mu        sync.RWMutex                           // 监听器map的读写锁
+	logger    *log.LoggerService                     // 日志服务
+	koanf     *koanf.Koanf                           // koanf实例
 	ctx       context.Context
 	cancel    context.CancelFunc
 	wg        sync.WaitGroup
@@ -57,20 +60,19 @@ type ConfigNotificationService struct {
 func NewConfigNotificationService(k *koanf.Koanf, logger *log.LoggerService) *ConfigNotificationService {
 	ctx, cancel := context.WithCancel(context.Background())
 	return &ConfigNotificationService{
-		logger: logger,
-		koanf:  k,
-		ctx:    ctx,
-		cancel: cancel,
+		listeners: make(map[ConfigChangeType][]*ConfigListener),
+		logger:    logger,
+		koanf:     k,
+		ctx:       ctx,
+		cancel:    cancel,
 	}
 }
 
 // RegisterListener 注册配置监听器
 func (cns *ConfigNotificationService) RegisterListener(listener *ConfigListener) error {
-	// 清理已存在的监听器
-	if existingValue, loaded := cns.listeners.LoadAndDelete(listener.ChangeType); loaded {
-		if existing, ok := existingValue.(interface{ cancel() }); ok {
-			existing.cancel()
-		}
+	// 生成唯一ID如果没有提供
+	if listener.ID == "" {
+		listener.ID = fmt.Sprintf("%s_%d", listener.Name, time.Now().UnixNano())
 	}
 
 	// 初始化新监听器
@@ -80,7 +82,11 @@ func (cns *ConfigNotificationService) RegisterListener(listener *ConfigListener)
 		return fmt.Errorf("failed to initialize listener state: %w", err)
 	}
 
-	cns.listeners.Store(listener.ChangeType, listener)
+	// 添加到监听器列表
+	cns.mu.Lock()
+	cns.listeners[listener.ChangeType] = append(cns.listeners[listener.ChangeType], listener)
+	cns.mu.Unlock()
+
 	return nil
 }
 
@@ -92,7 +98,7 @@ func (cns *ConfigNotificationService) initializeListenerState(listener *ConfigLi
 
 	if config := listener.GetConfigFunc(cns.koanf); config != nil {
 		listener.mu.Lock()
-		listener.lastConfig = deepCopyConfig(config)
+		listener.lastConfig = deepCopyConfigReflect(config)
 		listener.lastConfigHash = computeConfigHash(config)
 		listener.mu.Unlock()
 	}
@@ -100,23 +106,59 @@ func (cns *ConfigNotificationService) initializeListenerState(listener *ConfigLi
 	return nil
 }
 
-// UnregisterListener 注销配置监听器
-func (cns *ConfigNotificationService) UnregisterListener(changeType ConfigChangeType) {
-	if value, loaded := cns.listeners.LoadAndDelete(changeType); loaded {
-		if listener, ok := value.(*ConfigListener); ok {
+// UnregisterListener 注销指定ID的配置监听器
+func (cns *ConfigNotificationService) UnregisterListener(changeType ConfigChangeType, listenerID string) {
+	cns.mu.Lock()
+	defer cns.mu.Unlock()
+
+	listeners := cns.listeners[changeType]
+	for i, listener := range listeners {
+		if listener.ID == listenerID {
+			// 取消监听器
+			listener.cancel()
+			// 从切片中移除
+			cns.listeners[changeType] = append(listeners[:i], listeners[i+1:]...)
+			break
+		}
+	}
+
+	// 如果该类型没有监听器了，删除整个条目
+	if len(cns.listeners[changeType]) == 0 {
+		delete(cns.listeners, changeType)
+	}
+}
+
+// UnregisterAllListeners 注销指定类型的所有监听器
+func (cns *ConfigNotificationService) UnregisterAllListeners(changeType ConfigChangeType) {
+	cns.mu.Lock()
+	defer cns.mu.Unlock()
+
+	if listeners, exists := cns.listeners[changeType]; exists {
+		for _, listener := range listeners {
 			listener.cancel()
 		}
+		delete(cns.listeners, changeType)
 	}
 }
 
 // CheckConfigChanges 检查配置变更并通知相关监听器
 func (cns *ConfigNotificationService) CheckConfigChanges() {
-	cns.listeners.Range(func(key, value interface{}) bool {
-		if listener, ok := value.(*ConfigListener); ok {
+	cns.mu.RLock()
+	allListeners := make(map[ConfigChangeType][]*ConfigListener)
+	for changeType, listeners := range cns.listeners {
+		// 创建监听器切片的副本以避免并发访问问题
+		listenersCopy := make([]*ConfigListener, len(listeners))
+		copy(listenersCopy, listeners)
+		allListeners[changeType] = listenersCopy
+	}
+	cns.mu.RUnlock()
+
+	// 检查所有监听器
+	for _, listeners := range allListeners {
+		for _, listener := range listeners {
 			cns.checkAndNotify(listener)
 		}
-		return true
-	})
+	}
 }
 
 // checkAndNotify 检查配置变更并通知
@@ -144,7 +186,7 @@ func (cns *ConfigNotificationService) checkAndNotify(listener *ConfigListener) {
 
 	if hasChanges {
 		listener.mu.Lock()
-		listener.lastConfig = deepCopyConfig(currentConfig)
+		listener.lastConfig = deepCopyConfigReflect(currentConfig)
 		listener.lastConfigHash = currentHash
 		listener.mu.Unlock()
 
@@ -167,7 +209,82 @@ func computeConfigHash(config *models.AppConfig) string {
 	return fmt.Sprintf("%x", hash)
 }
 
-// deepCopyConfig 深拷贝配置对象
+// deepCopyConfigReflect 使用反射实现高效深拷贝
+func deepCopyConfigReflect(src *models.AppConfig) *models.AppConfig {
+	if src == nil {
+		return nil
+	}
+
+	// 使用反射进行深拷贝
+	srcValue := reflect.ValueOf(src).Elem()
+	dstValue := reflect.New(srcValue.Type()).Elem()
+
+	deepCopyValue(srcValue, dstValue)
+
+	return dstValue.Addr().Interface().(*models.AppConfig)
+}
+
+// deepCopyValue 递归深拷贝reflect.Value
+func deepCopyValue(src, dst reflect.Value) {
+	switch src.Kind() {
+	case reflect.Ptr:
+		if src.IsNil() {
+			return
+		}
+		dst.Set(reflect.New(src.Elem().Type()))
+		deepCopyValue(src.Elem(), dst.Elem())
+
+	case reflect.Struct:
+		for i := 0; i < src.NumField(); i++ {
+			if dst.Field(i).CanSet() {
+				deepCopyValue(src.Field(i), dst.Field(i))
+			}
+		}
+
+	case reflect.Slice:
+		if src.IsNil() {
+			return
+		}
+		dst.Set(reflect.MakeSlice(src.Type(), src.Len(), src.Cap()))
+		for i := 0; i < src.Len(); i++ {
+			deepCopyValue(src.Index(i), dst.Index(i))
+		}
+
+	case reflect.Map:
+		if src.IsNil() {
+			return
+		}
+		dst.Set(reflect.MakeMap(src.Type()))
+		for _, key := range src.MapKeys() {
+			srcValue := src.MapIndex(key)
+			dstValue := reflect.New(srcValue.Type()).Elem()
+			deepCopyValue(srcValue, dstValue)
+			dst.SetMapIndex(key, dstValue)
+		}
+
+	case reflect.Interface:
+		if src.IsNil() {
+			return
+		}
+		srcValue := src.Elem()
+		dstValue := reflect.New(srcValue.Type()).Elem()
+		deepCopyValue(srcValue, dstValue)
+		dst.Set(dstValue)
+
+	case reflect.Array:
+		for i := 0; i < src.Len(); i++ {
+			deepCopyValue(src.Index(i), dst.Index(i))
+		}
+
+	default:
+		// 对于基本类型和string，直接赋值
+		if dst.CanSet() {
+			dst.Set(src)
+		}
+	}
+}
+
+// deepCopyConfig 保留原有的JSON深拷贝方法作为备用
 func deepCopyConfig(src *models.AppConfig) *models.AppConfig {
 	if src == nil {
 		return nil
@@ -197,8 +314,8 @@ func (cns *ConfigNotificationService) debounceNotify(listener *ConfigListener, o
 	}
 
 	// 创建配置副本，避免在闭包中持有原始引用
-	oldConfigCopy := deepCopyConfig(oldConfig)
-	newConfigCopy := deepCopyConfig(newConfig)
+	oldConfigCopy := deepCopyConfigReflect(oldConfig)
+	newConfigCopy := deepCopyConfigReflect(newConfig)
 
 	changeType := listener.ChangeType
 
@@ -246,18 +363,33 @@ func (cns *ConfigNotificationService) executeCallback(
 func (cns *ConfigNotificationService) Cleanup() {
 	cns.cancel() // 取消所有context
 
-	cns.listeners.Range(func(key, value interface{}) bool {
-		cns.listeners.Delete(key)
-		return true
-	})
+	cns.mu.Lock()
+	for changeType, listeners := range cns.listeners {
+		for _, listener := range listeners {
+			listener.cancel()
+		}
+		delete(cns.listeners, changeType)
+	}
+	cns.mu.Unlock()
 
 	cns.wg.Wait() // 等待所有协程完成
 }
 
+// GetListeners 获取指定类型的所有监听器
+func (cns *ConfigNotificationService) GetListeners(changeType ConfigChangeType) []*ConfigListener {
+	cns.mu.RLock()
+	defer cns.mu.RUnlock()
+
+	listeners := cns.listeners[changeType]
+	result := make([]*ConfigListener, len(listeners))
+	copy(result, listeners)
+	return result
+}
+
 // CreateHotkeyListener 创建热键配置监听器
-func CreateHotkeyListener(callback func(enable bool, hotkey *models.HotkeyCombo) error) *ConfigListener {
+func CreateHotkeyListener(name string, callback func(enable bool, hotkey *models.HotkeyCombo) error) *ConfigListener {
 	return &ConfigListener{
-		Name:       "HotkeyListener",
+		Name:       name,
 		ChangeType: ConfigChangeTypeHotkey,
 		Callback: func(changeType ConfigChangeType, oldConfig, newConfig *models.AppConfig) error {
 			if newConfig != nil {
@@ -279,9 +411,9 @@ func CreateHotkeyListener(callback func(enable bool, hotkey *models.HotkeyCombo)
 }
 
 // CreateDataPathListener 创建数据路径配置监听器
-func CreateDataPathListener(callback func(oldPath, newPath string) error) *ConfigListener {
+func CreateDataPathListener(name string, callback func() error) *ConfigListener {
 	return &ConfigListener{
-		Name:       "DataPathListener",
+		Name:       name,
 		ChangeType: ConfigChangeTypeDataPath,
 		Callback: func(changeType ConfigChangeType, oldConfig, newConfig *models.AppConfig) error {
 			var oldPath, newPath string
@@ -298,7 +430,7 @@ func CreateDataPathListener(callback func(oldPath, newPath string) error) *Confi
 			}
 
 			if oldPath != newPath {
-				return callback(oldPath, newPath)
+				return callback()
 			}
 			return nil
 		},
@@ -313,8 +445,8 @@ func CreateDataPathListener(callback func(oldPath, newPath string) error) *Confi
 	}
 }
 
-// ServiceShutdown 关闭服务
-func (cns *ConfigNotificationService) ServiceShutdown() error {
+// OnShutdown 关闭服务
+func (cns *ConfigNotificationService) OnShutdown() error {
 	cns.Cleanup()
 	return nil
 }

internal/services/config_service.go

@@ -290,22 +290,22 @@ func (cs *ConfigService) SetHotkeyChangeCallback(callback func(enable bool, hotk
 	defer cs.mu.Unlock()
 
 	// 创建热键监听器并注册
-	hotkeyListener := CreateHotkeyListener(callback)
+	hotkeyListener := CreateHotkeyListener("DefaultHotkeyListener", callback)
 	return cs.notificationService.RegisterListener(hotkeyListener)
 }
 
 // SetDataPathChangeCallback 设置数据路径配置变更回调
-func (cs *ConfigService) SetDataPathChangeCallback(callback func(oldPath, newPath string) error) error {
+func (cs *ConfigService) SetDataPathChangeCallback(callback func() error) error {
 	cs.mu.Lock()
 	defer cs.mu.Unlock()
 
 	// 创建数据路径监听器并注册
-	dataPathListener := CreateDataPathListener(callback)
+	dataPathListener := CreateDataPathListener("DefaultDataPathListener", callback)
 	return cs.notificationService.RegisterListener(dataPathListener)
 }
 
-// ServiceShutdown 关闭服务
-func (cs *ConfigService) ServiceShutdown() error {
+// OnShutdown 关闭服务
+func (cs *ConfigService) OnShutdown() error {
 	cs.stopWatching()
 	if cs.notificationService != nil {
 		cs.notificationService.Cleanup()

internal/services/document_service.go

@@ -2,270 +2,337 @@ package services
 
 import (
 	"context"
-	"os"
+	"database/sql"
+	"fmt"
 	"path/filepath"
 	"sync"
-	"sync/atomic"
 	"time"
 	"voidraft/internal/models"
 
+	"github.com/wailsapp/wails/v3/pkg/application"
 	"github.com/wailsapp/wails/v3/pkg/services/log"
+	_ "modernc.org/sqlite" // SQLite driver
 )
 
-// DocumentService 提供文档管理功能
+// SQL constants for database operations
+const (
+	dbName = "voidraft.db"
+	// Database schema (simplified single table with auto-increment ID)
+	sqlCreateDocumentsTable = `
+CREATE TABLE IF NOT EXISTS documents (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    title TEXT NOT NULL,
+    content TEXT DEFAULT '∞∞∞text-a',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+)`
+
+	// Performance optimization indexes
+	sqlCreateIndexUpdatedAt = `CREATE INDEX IF NOT EXISTS idx_documents_updated_at ON documents(updated_at DESC)`
+	sqlCreateIndexTitle     = `CREATE INDEX IF NOT EXISTS idx_documents_title ON documents(title)`
+
+	// SQLite performance optimization settings
+	sqlOptimizationSettings = `
+PRAGMA journal_mode = WAL;
+PRAGMA synchronous = NORMAL;
+PRAGMA cache_size = -64000;
+PRAGMA temp_store = MEMORY;
+PRAGMA foreign_keys = ON;`
+
+	// Document operations
+	sqlGetDocumentByID = `
+SELECT id, title, content, created_at, updated_at 
+FROM documents 
+WHERE id = ?`
+
+	sqlInsertDocument = `
+INSERT INTO documents (title, content, created_at, updated_at)
+VALUES (?, ?, ?, ?)`
+
+	sqlUpdateDocument = `
+UPDATE documents 
+SET title = ?, content = ?, updated_at = ?
+WHERE id = ?`
+
+	sqlUpdateDocumentContent = `
+UPDATE documents 
+SET content = ?, updated_at = ?
+WHERE id = ?`
+
+	sqlUpdateDocumentTitle = `
+UPDATE documents 
+SET title = ?, updated_at = ?
+WHERE id = ?`
+
+	sqlDeleteDocument = `
+DELETE FROM documents WHERE id = ?`
+
+	sqlListAllDocumentsMeta = `
+SELECT id, title, created_at, updated_at 
+FROM documents 
+ORDER BY updated_at DESC`
+
+	sqlGetFirstDocumentID = `
+SELECT id FROM documents ORDER BY id LIMIT 1`
+)
+
+// DocumentService provides document management functionality
 type DocumentService struct {
 	configService *ConfigService
 	logger        *log.LoggerService
-	docStore      *Store[models.Document]
-
-	// 文档状态管理
-	mu       sync.RWMutex
-	document *models.Document
-
-	// 自动保存管理
+	db            *sql.DB
+	mu            sync.RWMutex
 	ctx           context.Context
-	cancel        context.CancelFunc
-	isDirty       atomic.Bool
-	lastSaveTime  atomic.Int64 // unix timestamp
-	saveScheduler chan struct{}
-
-	// 初始化控制
-	initOnce sync.Once
 }
 
-// NewDocumentService 创建文档服务
+// NewDocumentService creates a new document service
 func NewDocumentService(configService *ConfigService, logger *log.LoggerService) *DocumentService {
 	if logger == nil {
 		logger = log.New()
 	}
 
-	ctx, cancel := context.WithCancel(context.Background())
 	return &DocumentService{
 		configService: configService,
 		logger:        logger,
-		ctx:           ctx,
-		cancel:        cancel,
-		saveScheduler: make(chan struct{}, 1),
 	}
 }
 
-// Initialize 初始化服务
-func (ds *DocumentService) Initialize() error {
-	var initErr error
-	ds.initOnce.Do(func() {
-		initErr = ds.doInitialize()
-	})
-	return initErr
+// OnStartup initializes the service when the application starts
+func (ds *DocumentService) OnStartup(ctx context.Context, _ application.ServiceOptions) error {
+	ds.ctx = ctx
+	return ds.initDatabase()
 }
 
-// doInitialize 执行初始化
-func (ds *DocumentService) doInitialize() error {
-	if err := ds.initStore(); err != nil {
-		return err
-	}
-
-	ds.loadDocument()
-	go ds.autoSaveWorker()
-	return nil
-}
-
-// initStore 初始化存储
-func (ds *DocumentService) initStore() error {
-	docPath, err := ds.getDocumentPath()
+// initDatabase initializes the SQLite database
+func (ds *DocumentService) initDatabase() error {
+	dbPath, err := ds.getDatabasePath()
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to get database path: %w", err)
 	}
 
-	if err := os.MkdirAll(filepath.Dir(docPath), 0755); err != nil {
-		return err
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return fmt.Errorf("failed to open database: %w", err)
 	}
 
-	ds.docStore = NewStore[models.Document](StoreOption{
-		FilePath: docPath,
-		AutoSave: false,
-		Logger:   ds.logger,
-	})
+	ds.db = db
+
+	// Apply optimization settings
+	if _, err := db.Exec(sqlOptimizationSettings); err != nil {
+		return fmt.Errorf("failed to apply optimization settings: %w", err)
+	}
+
+	// Create table
+	if _, err := db.Exec(sqlCreateDocumentsTable); err != nil {
+		return fmt.Errorf("failed to create table: %w", err)
+	}
+
+	// Create indexes
+	if err := ds.createIndexes(); err != nil {
+		return fmt.Errorf("failed to create indexes: %w", err)
+	}
+
+	// Ensure default document exists
+	if err := ds.ensureDefaultDocument(); err != nil {
+		return fmt.Errorf("failed to ensure default document: %w", err)
+	}
 
 	return nil
 }
 
-// getDocumentPath 获取文档路径
-func (ds *DocumentService) getDocumentPath() (string, error) {
+// getDatabasePath gets the database file path
+func (ds *DocumentService) getDatabasePath() (string, error) {
 	config, err := ds.configService.GetConfig()
 	if err != nil {
 		return "", err
 	}
-	return filepath.Join(config.General.DataPath, "docs", "default.json"), nil
+	return filepath.Join(config.General.DataPath, dbName), nil
 }
 
-// loadDocument 加载文档
-func (ds *DocumentService) loadDocument() {
-	ds.mu.Lock()
-	defer ds.mu.Unlock()
-
-	doc := ds.docStore.Get()
-	if doc.Meta.ID == "" {
-		ds.document = models.NewDefaultDocument()
-		ds.docStore.Set(*ds.document)
-	} else {
-		ds.document = &doc
+// createIndexes creates database indexes
+func (ds *DocumentService) createIndexes() error {
+	indexes := []string{
+		sqlCreateIndexUpdatedAt,
+		sqlCreateIndexTitle,
 	}
 
-	ds.lastSaveTime.Store(time.Now().Unix())
-}
-
-// GetActiveDocument 获取活动文档
-func (ds *DocumentService) GetActiveDocument() (*models.Document, error) {
-	ds.mu.RLock()
-	defer ds.mu.RUnlock()
-
-	if ds.document == nil {
-		return nil, nil
-	}
-
-	docCopy := *ds.document
-	return &docCopy, nil
-}
-
-// UpdateActiveDocumentContent 更新文档内容
-func (ds *DocumentService) UpdateActiveDocumentContent(content string) error {
-	ds.mu.Lock()
-	defer ds.mu.Unlock()
-
-	if ds.document != nil && ds.document.Content != content {
-		ds.document.Content = content
-		ds.markDirty()
-	}
-
-	return nil
-}
-
-// markDirty 标记为脏数据并触发自动保存
-func (ds *DocumentService) markDirty() {
-	if ds.isDirty.CompareAndSwap(false, true) {
-		select {
-		case ds.saveScheduler <- struct{}{}:
-		default: // 已有保存任务在队列中
-		}
-	}
-}
-
-// ForceSave 强制保存
-func (ds *DocumentService) ForceSave() error {
-	return ds.saveDocument()
-}
-
-// saveDocument 保存文档
-func (ds *DocumentService) saveDocument() error {
-	ds.mu.Lock()
-	defer ds.mu.Unlock()
-
-	if ds.document == nil {
-		return nil
-	}
-
-	now := time.Now()
-	ds.document.Meta.LastUpdated = now
-
-	if err := ds.docStore.Set(*ds.document); err != nil {
-		return err
-	}
-
-	if err := ds.docStore.Save(); err != nil {
-		return err
-	}
-
-	ds.isDirty.Store(false)
-	ds.lastSaveTime.Store(now.Unix())
-	return nil
-}
-
-// autoSaveWorker 自动保存工作协程
-func (ds *DocumentService) autoSaveWorker() {
-	ticker := time.NewTicker(ds.getAutoSaveInterval())
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ds.ctx.Done():
-			return
-		case <-ds.saveScheduler:
-			ds.performAutoSave()
-		case <-ticker.C:
-			if ds.isDirty.Load() {
-				ds.performAutoSave()
-			}
-			// 动态调整保存间隔
-			ticker.Reset(ds.getAutoSaveInterval())
-		}
-	}
-}
-
-// getAutoSaveInterval 获取自动保存间隔
-func (ds *DocumentService) getAutoSaveInterval() time.Duration {
-	config, err := ds.configService.GetConfig()
-	if err != nil {
-		return 5 * time.Second
-	}
-	return time.Duration(config.Editing.AutoSaveDelay) * time.Millisecond
-}
-
-// performAutoSave 执行自动保存
-func (ds *DocumentService) performAutoSave() {
-	if !ds.isDirty.Load() {
-		return
-	}
-
-	// 防抖：避免过于频繁的保存
-	lastSave := time.Unix(ds.lastSaveTime.Load(), 0)
-	if time.Since(lastSave) < time.Second {
-		// 延迟重试
-		time.AfterFunc(time.Second, func() {
-			select {
-			case ds.saveScheduler <- struct{}{}:
-			default:
-			}
-		})
-		return
-	}
-
-	if err := ds.saveDocument(); err != nil {
-		ds.logger.Error("auto save failed", "error", err)
-	}
-}
-
-// ReloadDocument 重新加载文档
-func (ds *DocumentService) ReloadDocument() error {
-	// 先保存当前文档
-	if ds.isDirty.Load() {
-		if err := ds.saveDocument(); err != nil {
+	for _, index := range indexes {
+		if _, err := ds.db.Exec(index); err != nil {
 			return err
 		}
 	}
+	return nil
+}
 
-	// 重新初始化存储
-	if err := ds.initStore(); err != nil {
+// ensureDefaultDocument ensures a default document exists
+func (ds *DocumentService) ensureDefaultDocument() error {
+	// Check if any document exists
+	var count int
+	err := ds.db.QueryRow("SELECT COUNT(*) FROM documents").Scan(&count)
+	if err != nil {
 		return err
 	}
 
-	// 重新加载
-	ds.loadDocument()
+	// If no documents exist, create default document
+	if count == 0 {
+		defaultDoc := models.NewDefaultDocument()
+		_, err := ds.CreateDocument(defaultDoc.Title)
+		return err
+	}
 	return nil
 }
 
-// ServiceShutdown 关闭服务
-func (ds *DocumentService) ServiceShutdown() error {
-	ds.cancel() // 停止自动保存工作协程
+// GetDocumentByID gets a document by ID
+func (ds *DocumentService) GetDocumentByID(id int64) (*models.Document, error) {
+	ds.mu.RLock()
+	defer ds.mu.RUnlock()
 
-	// 最后保存
-	if ds.isDirty.Load() {
-		return ds.saveDocument()
+	var doc models.Document
+	row := ds.db.QueryRow(sqlGetDocumentByID, id)
+	err := row.Scan(&doc.ID, &doc.Title, &doc.Content, &doc.CreatedAt, &doc.UpdatedAt)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, fmt.Errorf("failed to get document by ID: %w", err)
 	}
 
+	return &doc, nil
+}
+
+// CreateDocument creates a new document and returns the created document with ID
+func (ds *DocumentService) CreateDocument(title string) (*models.Document, error) {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
+
+	// Create document with default content
+	now := time.Now()
+	doc := &models.Document{
+		Title:     title,
+		Content:   "∞∞∞text-a\n",
+		CreatedAt: now,
+		UpdatedAt: now,
+	}
+
+	result, err := ds.db.Exec(sqlInsertDocument, doc.Title, doc.Content, doc.CreatedAt, doc.UpdatedAt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create document: %w", err)
+	}
+
+	// Get the auto-generated ID
+	id, err := result.LastInsertId()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get last insert ID: %w", err)
+	}
+
+	// Return the created document with ID
+	doc.ID = id
+	return doc, nil
+}
+
+// UpdateDocumentContent updates the content of a document
+func (ds *DocumentService) UpdateDocumentContent(id int64, content string) error {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
+
+	_, err := ds.db.Exec(sqlUpdateDocumentContent, content, time.Now(), id)
+	if err != nil {
+		return fmt.Errorf("failed to update document content: %w", err)
+	}
 	return nil
 }
 
-// OnDataPathChanged 处理数据路径变更
-func (ds *DocumentService) OnDataPathChanged(oldPath, newPath string) error {
-	return ds.ReloadDocument()
+// UpdateDocumentTitle updates the title of a document
+func (ds *DocumentService) UpdateDocumentTitle(id int64, title string) error {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
+
+	_, err := ds.db.Exec(sqlUpdateDocumentTitle, title, time.Now(), id)
+	if err != nil {
+		return fmt.Errorf("failed to update document title: %w", err)
+	}
+	return nil
+}
+
+// DeleteDocument deletes a document (not allowed if it's the only document)
+func (ds *DocumentService) DeleteDocument(id int64) error {
+	ds.mu.Lock()
+	defer ds.mu.Unlock()
+
+	// Check if this is the only document
+	var count int
+	err := ds.db.QueryRow("SELECT COUNT(*) FROM documents").Scan(&count)
+	if err != nil {
+		return fmt.Errorf("failed to count documents: %w", err)
+	}
+
+	// Don't allow deletion if this is the only document
+	if count <= 1 {
+		return fmt.Errorf("cannot delete the last document")
+	}
+
+	_, err = ds.db.Exec(sqlDeleteDocument, id)
+	if err != nil {
+		return fmt.Errorf("failed to delete document: %w", err)
+	}
+	return nil
+}
+
+// ListAllDocumentsMeta lists all document metadata
+func (ds *DocumentService) ListAllDocumentsMeta() ([]*models.Document, error) {
+	ds.mu.RLock()
+	defer ds.mu.RUnlock()
+
+	rows, err := ds.db.Query(sqlListAllDocumentsMeta)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list document meta: %w", err)
+	}
+	defer rows.Close()
+
+	var documents []*models.Document
+	for rows.Next() {
+		var doc models.Document
+		err := rows.Scan(&doc.ID, &doc.Title, &doc.CreatedAt, &doc.UpdatedAt)
+		if err != nil {
+			return nil, fmt.Errorf("failed to scan document meta: %w", err)
+		}
+		documents = append(documents, &doc)
+	}
+
+	return documents, nil
+}
+
+// GetFirstDocumentID gets the first document's ID for frontend initialization
+func (ds *DocumentService) GetFirstDocumentID() (int64, error) {
+	ds.mu.RLock()
+	defer ds.mu.RUnlock()
+
+	var id int64
+	err := ds.db.QueryRow(sqlGetFirstDocumentID).Scan(&id)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return 0, nil // No documents exist
+		}
+		return 0, fmt.Errorf("failed to get first document ID: %w", err)
+	}
+	return id, nil
+}
+
+// OnShutdown shuts down the service when the application closes
+func (ds *DocumentService) OnShutdown() error {
+	if ds.db != nil {
+		return ds.db.Close()
+	}
+	return nil
+}
+
+// OnDataPathChanged handles data path changes
+func (ds *DocumentService) OnDataPathChanged() error {
+	// Close existing database
+	if ds.db != nil {
+		ds.db.Close()
+	}
+
+	// Reinitialize with new path
+	return ds.initDatabase()
 }

internal/services/extension_service.go

@@ -257,8 +257,8 @@ func (es *ExtensionService) ResetAllExtensionsToDefault() error {
 	return nil
 }
 
-// ServiceShutdown 关闭服务
-func (es *ExtensionService) ServiceShutdown() error {
+// OnShutdown 关闭服务
+func (es *ExtensionService) OnShutdown() error {
 	es.cancel()
 	return nil
 }

internal/services/hotkey_service.go

@@ -259,7 +259,7 @@ func (hs *HotkeyService) IsRegistered() bool {
 	return hs.isRegistered.Load()
 }
 
-// ServiceShutdown 关闭服务
+// OnShutdown 关闭服务
 func (hs *HotkeyService) ServiceShutdown() error {
 	hs.cancel()
 	hs.wg.Wait()

internal/services/hotkey_service_darwin.go

@@ -283,8 +283,8 @@ func (hs *HotkeyService) IsRegistered() bool {
 	return hs.isRegistered.Load()
 }
 
-// ServiceShutdown 关闭热键服务
-func (hs *HotkeyService) ServiceShutdown() error {
+// OnShutdown 关闭热键服务
+func (hs *HotkeyService) OnShutdown() error {
 	return hs.UnregisterHotkey()
 }
 

internal/services/hotkey_service_linux.go

@@ -384,8 +384,8 @@ func (hs *HotkeyService) IsRegistered() bool {
 	return hs.isRegistered.Load()
 }
 
-// ServiceShutdown 关闭服务
-func (hs *HotkeyService) ServiceShutdown() error {
+// OnShutdown 关闭服务
+func (hs *HotkeyService) OnShutdown() error {
 	hs.cancel()
 	hs.wg.Wait()
 	C.closeX11Display()

internal/services/keybinding_service.go

@@ -185,8 +185,8 @@ func (kbs *KeyBindingService) GetAllKeyBindings() ([]models.KeyBinding, error) {
 	return config.KeyBindings, nil
 }
 
-// ServiceShutdown 关闭服务
-func (kbs *KeyBindingService) ServiceShutdown() error {
+// OnShutdown 关闭服务
+func (kbs *KeyBindingService) OnShutdown() error {
 	kbs.cancel()
 	return nil
 }

internal/services/path_migration_service.go

@@ -417,8 +417,8 @@ func (ms *MigrationService) CancelMigration() error {
 	return fmt.Errorf("no active migration to cancel")
 }
 
-// ServiceShutdown 服务关闭
-func (ms *MigrationService) ServiceShutdown() error {
+// OnShutdown 服务关闭
+func (ms *MigrationService) OnShutdown() error {
 	ms.CancelMigration()
 	return nil
 }

internal/services/service_manager.go

@@ -74,19 +74,13 @@ func NewServiceManager() *ServiceManager {
 	}
 
 	// 设置数据路径变更监听，处理配置重置和路径变更
-	err = configService.SetDataPathChangeCallback(func(oldPath, newPath string) error {
-		return documentService.OnDataPathChanged(oldPath, newPath)
+	err = configService.SetDataPathChangeCallback(func() error {
+		return documentService.OnDataPathChanged()
 	})
 	if err != nil {
 		panic(err)
 	}
 
-	// 初始化文档服务
-	err = documentService.Initialize()
-	if err != nil {
-		panic(err)
-	}
-
 	return &ServiceManager{
 		configService:     configService,
 		documentService:   documentService,