no close db while finding the userid

main.py

@@ -237,7 +237,7 @@ async def receive(userModel : models.TransactionNft):
         return {'msg': 'user address not found'}
     else:
         userid = result['userid']
-        db.close()
+        
 
     # update nft owner
     if table3.find_one(nftid=nftid):