attachment class

db/base.py

@@ -1,3 +1,11 @@
-from sqlalchemy.ext.declarative import declarative_base
+from typing import Any
 
-Base = declarative_base()
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import MappedAsDataclass
+from sqlalchemy.types import JSON
+
+class Base(DeclarativeBase, MappedAsDataclass):
+    type_annotation_map = {
+        dict[str, Any]: JSON,
+        list[str]: JSON,
+    }