Ive fixed too many juicy bugs over the last couple of years to pick just one. So this will likely be the first of a series.
I fixed one a couple of years ago in an iOS app. There was some offline storage where records could be saved, and for security reasons they would be automatically deleted if not accessed for a certain duration.
Problem was, they never got deleted because every time the app synced with the server the timer was being reset.
Turned out the class being used to save the record in the first place, was also being used to update it on sync. And that class set the ‘lastAccessed’ property to ‘now’.
So I had to refactor the class structure so that we had 2 separate tasks as we should have in the first place, one to download the record and one to update it.