Discourse generating tons of images as topic thumbnails?

[merefield (Robert)]

Images should be deleted once orphaned:

How to make an image orphaned so that it gets removed?

All the details are available in this job https://github.com/discourse/discourse/blob/master/app/jobs/scheduled/clean_up_uploads.rb TL;DR: an image is orphaned if and only if it’s not referenced in the latest version of a post in a draft in a queued post in a logo site setting in a custom emoji in a theme in a user avatar/background/card image in a category logo/background image