[xmprt]

The GPT-4 answer is only better in so far as it uses RunTransaction. I don't know why it's trying to loop through the stores and then running the i'th operation on that store when it could have just had the store referenced in the operation instead of passing it as a parameter. And then it's also creating a new client for each transaction which seems wrong (to be fair I'm not familiar with Firestore so maybe this is idiomatic).

[iillexial]

It's not idiomatic. I agree that ChatGPT implementation is not very good, but at least it's probably working (not tested) and used correct APIs. I tried several iterations after that, and it came up with a better design.