What about a script that can manage multiple POST inputs to the same cell from different users intelligently. Right now my logic is: Input to a cell from a POST request -> sheet formula takes that input and -> returns output in another cell -> GET takes that output from the cell and sends it to the user.

However, if second user inputs to that same cell with a POST request before that process is complete for the first user, the first user will get the second user's output.

I am looking for good ways to prevent this from occurring-or perhaps an entirely different approach is ideal.