同步优化2

lib/pages/sync/server_sync_page.dart

@@ -129,6 +129,7 @@ class _ServerSyncPageState extends State<ServerSyncPage> {
     if (value && _isActivated) {
       // 开启同步：合并本地与服务端数据
       await _prefs.setSyncEnabled(true);
+      if (!mounted) return;
       setState(() => _syncEnabled = true);
       if (mounted) ToastUtil.show(context, '正在同步数据...');
       await ServerSyncService.instance.syncWithServer();
@@ -142,6 +143,7 @@ class _ServerSyncPageState extends State<ServerSyncPage> {
       if (mounted) ToastUtil.show(context, '正在从服务器下载数据...');
       final success = await ServerSyncService.instance.downloadToLocal();
       await _prefs.setSyncEnabled(false);
+      if (!mounted) return;
       setState(() => _syncEnabled = false);
       final provider = context.read<AppProvider>();
       await provider.loadMovies();

lib/utils/sync/server_sync_service.dart

@@ -404,9 +404,14 @@ class ServerSyncService {
 
       final dbPath = await DatabaseHelper.instance.databasePath;
       if (dbPath != null) {
+        final dbFile = File(dbPath);
+        // 先关掉旧连接，删除旧文件，再写入新数据库
         await DatabaseHelper.instance.close();
-        await File(dbPath).writeAsBytes(dbResp.bodyBytes);
-        await DatabaseHelper.instance.reopen();
+        if (await dbFile.exists()) await dbFile.delete();
+        await dbFile.writeAsBytes(dbResp.bodyBytes);
+        // 设置正确的版本号
+        final db = await openDatabase(dbPath, version: 14);
+        await db.close();
         debugPrint('[Sync] 数据库已写入: $dbPath');
       }