fix issue

app/models/base.py

@@ -29,6 +29,16 @@ class TimestampMixin:
         DateTime, default=func.now(), onupdate=func.now(), comment="更新时间"
     )
 
+    def to_dict(self) -> Dict[str, Any]:
+        """将模型转为字典"""
+        result = {}
+        for col in self.__table__.columns:
+            val = getattr(self, col.name)
+            if isinstance(val, datetime):
+                val = val.isoformat()
+            result[col.name] = val
+        return result
+
 
 class KnowledgePage(Base, TimestampMixin):
     """知识页面"""
@@ -92,3 +102,13 @@ class WebsiteSettings(Base):
     updated_at: Mapped[datetime] = mapped_column(
         DateTime, default=func.now(), onupdate=func.now(), comment="更新时间"
     )
+
+    def to_dict(self) -> Dict[str, Any]:
+        """将模型转为字典"""
+        result = {}
+        for col in self.__table__.columns:
+            val = getattr(self, col.name)
+            if isinstance(val, datetime):
+                val = val.isoformat()
+            result[col.name] = val
+        return result