优化model

chat/models/base.py

@@ -0,0 +1,13 @@
+from db.session import Base
+from sqlalchemy import (
+    Column, Integer, String, Text, DateTime, Boolean, Float, ForeignKey
+)
+
+# 基础模型类
+class CoreModel(Base):
+    __abstract__ = True
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    create_time = Column(DateTime)
+    update_time = Column(DateTime)
+    is_deleted = Column(Boolean, default=False)