feat(todos): 修改 todos 表结构，迁移至复合主键并添加索引

src/storage/mod.rs

@@ -1493,7 +1493,7 @@ impl SessionStore {
         // Insert new todos
         for item in items {
             conn.execute(
-                "INSERT INTO todos (id, scope_key, session_id, topic_id, content, status, priority, created_at, updated_at)
+                "INSERT OR REPLACE INTO todos (id, scope_key, session_id, topic_id, content, status, priority, created_at, updated_at)
                  VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)",
                 params![
                     item.id,
@@ -1904,7 +1904,7 @@ fn ensure_todos_schema(conn: &Connection) -> Result<(), StorageError> {
         conn.execute_batch(
             "
             CREATE TABLE IF NOT EXISTS todos (
-                id TEXT PRIMARY KEY,
+                id TEXT NOT NULL,
                 scope_key TEXT NOT NULL,
                 session_id TEXT NOT NULL,
                 topic_id TEXT,
@@ -1912,7 +1912,8 @@ fn ensure_todos_schema(conn: &Connection) -> Result<(), StorageError> {
                 status TEXT NOT NULL DEFAULT 'pending',
                 priority TEXT NOT NULL DEFAULT 'medium',
                 created_at INTEGER NOT NULL,
-                updated_at INTEGER NOT NULL
+                updated_at INTEGER NOT NULL,
+                PRIMARY KEY (id, scope_key)
             );
 
             CREATE INDEX IF NOT EXISTS idx_todos_scope
@@ -1922,6 +1923,55 @@ fn ensure_todos_schema(conn: &Connection) -> Result<(), StorageError> {
                 ON todos(session_id);
             ",
         )?;
+        return Ok(());
+    }
+
+    // Migration: check if old schema has single-column PRIMARY KEY on `id`
+    // If so, migrate to composite PRIMARY KEY (id, scope_key)
+    let sql: String = conn
+        .query_row(
+            "SELECT sql FROM sqlite_master WHERE type='table' AND name='todos'",
+            [],
+            |row| row.get::<_, String>(0),
+        )
+        .unwrap_or_default();
+
+    let needs_migration = sql.contains("id TEXT PRIMARY KEY")
+        || (sql.contains("PRIMARY KEY") && !sql.contains("PRIMARY KEY (id, scope_key)"));
+
+    if needs_migration {
+        tracing::info!("Migrating todos table to composite PRIMARY KEY (id, scope_key)");
+        conn.execute_batch(
+            "
+            CREATE TABLE todos_new (
+                id TEXT NOT NULL,
+                scope_key TEXT NOT NULL,
+                session_id TEXT NOT NULL,
+                topic_id TEXT,
+                content TEXT NOT NULL,
+                status TEXT NOT NULL DEFAULT 'pending',
+                priority TEXT NOT NULL DEFAULT 'medium',
+                created_at INTEGER NOT NULL,
+                updated_at INTEGER NOT NULL,
+                PRIMARY KEY (id, scope_key)
+            );
+
+            INSERT OR IGNORE INTO todos_new
+                SELECT id, scope_key, session_id, topic_id, content, status, priority, created_at, updated_at
+                FROM todos;
+
+            DROP TABLE todos;
+
+            ALTER TABLE todos_new RENAME TO todos;
+
+            CREATE INDEX IF NOT EXISTS idx_todos_scope
+                ON todos(scope_key, created_at ASC);
+
+            CREATE INDEX IF NOT EXISTS idx_todos_session
+                ON todos(session_id);
+            ",
+        )?;
+        tracing::info!("Todos table migration complete");
     }
 
     Ok(())

web/src/components/Settings/ConfigPage.tsx

@@ -165,6 +165,11 @@ export function ConfigPage({ onClose, onSaveConnection }: ConfigPageProps) {
   const [toast, setToast] = useState('')
   const [dirty, setDirty] = useState(false)
 
+  const handleClose = useCallback(() => {
+    if (dirty && !confirm('有未保存的更改，确定要关闭吗？')) return
+    onClose()
+  }, [dirty, onClose])
+
   // Load config
   useEffect(() => {
     fetch('/api/config').then(r => r.json()).then(data => {
@@ -175,10 +180,10 @@ export function ConfigPage({ onClose, onSaveConnection }: ConfigPageProps) {
 
   // ESC to close
   useEffect(() => {
-    const h = (e: KeyboardEvent) => { if (e.key === 'Escape') onClose() }
+    const h = (e: KeyboardEvent) => { if (e.key === 'Escape') handleClose() }
     document.addEventListener('keydown', h)
     return () => document.removeEventListener('keydown', h)
-  }, [onClose])
+  }, [handleClose])
 
   const update = useCallback(<K extends keyof AppConfig>(key: K, value: AppConfig[K]) => {
     setConfig(prev => prev ? { ...prev, [key]: value } : prev)
@@ -589,7 +594,7 @@ export function ConfigPage({ onClose, onSaveConnection }: ConfigPageProps) {
   }
 
   return (
-    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm animate-[fadeIn_0.15s_ease-out]" onClick={onClose}>
+    <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm animate-[fadeIn_0.15s_ease-out]" onClick={handleClose}>
       <div
         className="relative flex flex-col w-[92vw] max-w-4xl h-[85vh] rounded-2xl border border-[var(--border-color)] bg-[var(--bg-primary)] shadow-2xl overflow-hidden animate-[scaleIn_0.2s_ease-out]"
         onClick={e => e.stopPropagation()}
@@ -600,7 +605,7 @@ export function ConfigPage({ onClose, onSaveConnection }: ConfigPageProps) {
           <span className="text-lg font-semibold text-[var(--text-primary)]">系统配置</span>
           {dirty && <span className="text-xs text-amber-400 bg-amber-500/10 px-2 py-0.5 rounded-full">未保存</span>}
           <div className="flex-1" />
-          <button onClick={onClose} className="p-2 rounded-lg text-[var(--text-muted)] hover:text-[var(--text-primary)] hover:bg-[var(--overlay-hover)] transition-colors" title="关闭 (Esc)">
+          <button onClick={handleClose} className="p-2 rounded-lg text-[var(--text-muted)] hover:text-[var(--text-primary)] hover:bg-[var(--overlay-hover)] transition-colors" title="关闭 (Esc)">
             <X className="h-5 w-5" />
           </button>
         </div>
@@ -640,7 +645,7 @@ export function ConfigPage({ onClose, onSaveConnection }: ConfigPageProps) {
         <div className="shrink-0 px-6 py-3 border-t border-[var(--border-color)] bg-[var(--bg-secondary)]/80 backdrop-blur-md flex items-center gap-3">
           {error && <span className="text-sm text-red-400 truncate max-w-xs">{error}</span>}
           <div className="flex-1" />
-          <button onClick={onClose} className="px-4 py-2 rounded-lg text-sm text-[var(--text-secondary)] hover:text-[var(--text-primary)] hover:bg-[var(--overlay-hover)] transition-colors">
+          <button onClick={handleClose} className="px-4 py-2 rounded-lg text-sm text-[var(--text-secondary)] hover:text-[var(--text-primary)] hover:bg-[var(--overlay-hover)] transition-colors">
             取消
           </button>
           <button