> Worst part was, a few months after I made the app, Chrome dropped a bug on an update that wiped local storage on update, so I lost months of IndexedDB records.

That is the state of web currently. I don't care if FAANG or some standard committee have RFC saying that the storage is persistent, if it is NOT a file on the system it can just go away much like cookies or cache. Just think of what Safari did to indexdb of sites that is NOT bookmarked on the screen.