The possibility of app updates removing stuff from the library is interesting.
There is also a “database cleanup” task that runs every 24 hours which checks if an app is actually installed on the system, and if it’s not installed, it’s removed from the Mitch library menu. Normally that code should never run anyway, because apps should be removed from the library instantly as soon as they are uninstalled. Maybe that “sanity-checking” code triggers a false positive and deletes stuff for no reason. I will look into that a bit later.