This uses hex-encoded SHA1 hashes of the desired feeds' URLs to store them. It's much better than putting the URL or feed name as a filename because that would look ugly in the filesystem and possibly cause issues.
Submit an issue. Email me a patch or submit a PR if you've fixed it. Emailing patches is always preferred.
Copyright (C) 2020-2021 Ben O'Neill firstname.lastname@example.org. License: GNU GPL Version 3 https://gnu.org/licenses/gpl.html. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.