Update app/db.py

app/db.py

@@ -29,8 +29,13 @@ class User(SQLAlchemyBaseUserTableUUID, Base):
     pass
 
 
-engine = create_async_engine(DATABASE_URL)
-async_session_maker = async_sessionmaker(engine, expire_on_commit=False)
+engine = create_async_engine(DATABASE_URL, pool_per_ping=True)
+async_session_maker = async_sessionmaker(engine,
+                     #class_=AsyncSession,
+    autoflush=True,
+    autocommit=False,
+    expire_on_commit=False,                   
+                                        )
 
 
 async def create_db_and_tables():