There really needs to be an “undo” button for automatic category assignment for a particular retailer. It’s all too easy to click “All transactions past and going forwards” when asked you try to change the category for a particular transaction. This would overwrite ALL previous transactions with the click of a button, and there’s no way to reverse it easily…
For example, you buy mostly food at Costco. One day you get some fuel, accidentally click (fat fingers or whatever) “All transactions past and going forwards” when you try to change the category for that transaction, and it overwrites ALL previous transactions at Costco as fuel purchases, messing up all your previous hard work!
I personally would find it annoying but I’m happy to go with the majority.
Although, I imagine the initial mistake is because you’re rushing (even if it is fat fingers) so you’re likely just to press “yes, I’m sure” on the immediate popup aren’t you?