feat: 添加数据库迁移、清空聊天记录按钮 - 复用SAVE_HISTORY接口

core/server.py

@@ -345,9 +345,12 @@ class BackendServer:
 
     def _handle_save_history(self, body: Dict) -> Dict:
         messages = body.get("messages", [])
+        if messages and messages[0].get("action") == "clear":
+            self._graph.clear_chat_records()
+            return {"status": "history_cleared"}
         result = self._graph.save_chat_records(messages)
         return {"status": "history_saved"}
-
+    
     def _send_response(self, request_id: str, response: PacketResponse) -> None:
         with self._lock:
             q = self._response_queues.pop(request_id, None)