Mastodon is the most used software for running an Fediverse server. However, it is notorious for its high resource usage. In particular, it caches a lot of media from remote servers, which can be a problem for machines with limited storage. Mastodon docs recommend setting up a scheduled task to remove old media. Till version 4.0, this can be used to remove remote media and preview cards. But it does not have support for removing old user avatars and headers. A pull request just landed in Mast...
