Update app.py

app.py

@@ -13,6 +13,7 @@ from sqlalchemy import select, update, func
 from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
 from sqlalchemy.orm import sessionmaker, declarative_base
 from sqlalchemy import Column, Integer, String, DateTime, Text, Float, Boolean
+from sqlalchemy import JSON  
 import logging
 import hmac
 import hashlib