增加了event_handler修改内容的方法

src/chat/express/expression_learner.py

@@ -8,7 +8,6 @@ from typing import List, Dict, Optional, Any, Tuple
 
 from src.common.logger import get_logger
 from src.common.database.database_model import Expression
-from src.common.data_models.database_data_model import DatabaseMessages
 from src.llm_models.utils_model import LLMRequest
 from src.config.config import model_config, global_config
 from src.chat.utils.chat_message_builder import get_raw_msg_by_timestamp_with_chat_inclusive, build_anonymous_messages