Cleanup unused images on Server (future feature-request)

[krbrs]

VERSION INFORMATION

Server Version: daily

Desktop Version: daily

DESCRIPTION

Just leaving this here so it's not lost on discord:

Sometimes upon starting the new WebUI there are background images shown which are not associated to a series anymore. There is no cleanup routine for unused images right now, but this might be good to implement for a future release.

Currently I clean up this folder by removing all images, run the verify task and download all images again (nuclear option but working).