i m building an app for my institute using flutterflow. my mentor asked me to do a project. he asked me to implement 4 qr codes, like one is for breakfast, 2nd is for lunch, 3rd is for snacks, 4th is for dinner. and they should be generate every single day, which means they should create new one for set time like after 6 am. and another app for scanning that qr codes. he asked that when a qr code is scanned in another app for one time, it should not scan another time, in precise, it should not be scanned another time if scanned for once and when new qr code is generated, then only it should scanned