250109-5代码。

models/knowledge_base.py

@@ -2,6 +2,8 @@ from sqlalchemy import create_engine, Column, Integer, String, ForeignKey, DateT
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import relationship, sessionmaker
 
+from datetime import datetime
+
 Base = declarative_base()
 metadata = MetaData()