Update app.py

app.py

@@ -33,11 +33,13 @@ channel= int(chnl)
 
 ###DB BACKUP##
 
-async def downdb(msgid):
+async def downdb():
     client = TelegramClient(None, api_id, api_hash)
     await client.start(bot_token=bot_token)
-    os.remove('instance/database.db')    
-    await fast_download(client,msgid)
+    os.remove('instance/database.db')
+    async for message in client.iter_messages(channel_username, limit=1):
+        await fast_download(client,message)
+    
     return '2'