Cleaning Up Mobile App Entities

How can you delete bogus mobile app entities from an HA install?

There is no delete option in the integration UI. I can see there are entries in .storage/core.entity_registry & .storage/core.restore_state. If I remove them from the files they come back after a restart. So where is the actual truth stored? It can’t be these files. I’d really like to clean up this mess but don’t see a way to do it.