QR Scan - Detecting Duplicates

[TIMAI2]

Perhaps this might help:

Long Polling / Data Changed Event for Google Sheets

[sheets] A while ago I did some work on creating a dataChanged event for a php TinyWebDB, I have now worked up a similar solution for a google sheet. This is of benefit for apps with multiple users who may be working on the same dataset in google sheets, all other users will need to be made aware of any changes, and to update their data. Long Polling / Data Changed Event for Google Sheets