fix delete old state

managers/storage.py

@@ -135,15 +135,23 @@ class TaskStorage:
             return {}
 
     async def save_task(self, task_id: str, params: TaskParams) -> None:
-        tasks = await self.load_tasks()
-        tasks[task_id] = params
-        await self.save_tasks(tasks)
+        async with self._lock:
+            try:
+                data = await asyncio.to_thread(self._load_sync)
+                data[task_id] = self._params_to_dict(params)
+                await asyncio.to_thread(self._save_sync, data)
+            except Exception as e:
+                logger.error(f"save_task error: {e}")
 
     async def delete_task(self, task_id: str) -> None:
-        tasks = await self.load_tasks()
-        if task_id in tasks:
-            del tasks[task_id]
-            await self.save_tasks(tasks)
+        async with self._lock:
+            try:
+                data = await asyncio.to_thread(self._load_sync)
+                if task_id in data:
+                    del data[task_id]
+                    await asyncio.to_thread(self._save_sync, data)
+            except Exception as e:
+                logger.error(f"delete_task error: {e}")
 
 
 class ChatStorage: