在heli_db_to_excel.py中添加SEQUENCE_ID字段到数据处理结果，并新增根据会话ID查询SEQUENCE_ID的方法；在DifyCompareTest.py中优化回答判断逻辑，增加对空回答的处理，调整文件处理的最大并发数。

rag2_0/demo/heli_db_to_excel.py

@@ -277,6 +277,7 @@ class DataProcessor:
                 "消息发送者": record["message_sender"],
                 "发送者昵称": record["sender_nickname"],
                 "创建时间": record["CREATE_TIME"],
+                "SEQUENCE_ID": record["SEQUENCE_ID"],
             })
         
         return result
@@ -337,11 +338,21 @@ class MariaDBClient:
         df, _ = self.execute_query(sql, (start_date, end_date))
         return df
     
+    def get_sequence_id_by_session_id(self, session_id: str) -> Optional[pd.DataFrame]:
+        """根据会话ID查询消息详情"""
+        sql = """
+        SELECT SEQUENCE_ID
+        FROM crm_hlyj.crm_hlyj_dmri
+        WHERE SESSION_ID = %s
+        """
+        df, _ = self.execute_query(sql, (session_id,))
+        return df
+
     def query_messages_by_session_id(self, session_id: str) -> Optional[pd.DataFrame]:
         """根据会话ID查询消息详情"""
         sql = """
         SELECT CREATE_TIME, CUS_NICK_NAME, MODE, MSG_TYPE, AGENT_NAME, CONTENT, 
-               SESSION_ID, ACCOUNT, SYSTEM_MODE_MESSAGE_TYPE
+               SESSION_ID, ACCOUNT, SYSTEM_MODE_MESSAGE_TYPE, SEQUENCE_ID
         FROM crm_hlyj.crm_hlyj_dmri
         WHERE SESSION_ID = %s
         ORDER BY CREATE_TIME