Update app.py

app.py

@@ -36,13 +36,15 @@ channel= int(chnl)
 async def downdb():
     client = TelegramClient(None, api_id, api_hash)
     await client.start(bot_token=bot_token)
+    
     os.remove('instance/database.db')
     @client.on(events.NewMessage)
     async def handler(event):
         last_message = event.message
         await fast_download(client,last_message)
         await client.disconnect()
-    
+    db = SQLAlchemy(app)
+    migrate = Migrate(app, db)
     return '2'
 
 
@@ -509,7 +511,7 @@ def downdbur():
     # Create a new event loop for the current thread
     loop = asyncio.new_event_loop()
     asyncio.set_event_loop(loop)
-    
+    db.session.remove()
     # Run the async function
     rp = loop.run_until_complete(downdb())
     loop.close()  # Close the loop when done