修复最近上下文只取到当前消息的问题

db/message_storage.py

@@ -100,6 +100,7 @@ class MessageStorageDB(BaseDBOperator):
           AND length(content) > %s
           AND CHAR_LENGTH(content) < 300
           AND content NOT LIKE '/%'
+        ORDER BY timestamp ASC
         """
         params = (hours_ago, group_id, min_content_length)
         return self.execute_query(sql, params) or []