John Liu

I am sure that case that message event stream answer content is empty and then insert the empty value to the field `answer` in the table `messages`。

response event stream like this as following. ``` data: {"event": "agent_thought", "conversation_id": "a5233957-01e3-4bcf-bc9c-4390c1b92429", "message_id": "47d025d4-4141-4b70-9fdc-f921d5be0010", "created_at": 1719915570, "task_id": "1ae6620c-f80e-4da8-9900-3dc370010bee", "id": "d01ba9c8-e3cc-4b8c-9b72-d4f3dbc719d1", "position": 1, "thought": "", "observation": "", "tool": "", "tool_labels":...

The event stream final data with empty value for the answer field is inserted into the table 'messages', It is expected to be all the answer content but actionally inserted...