1. I suggest allowing us to filter out releases that aren't yet in the database.

Overall this will have a minimal effect on the releases page, because most manga are added to the database very quickly after being listed as a release. But it will help to filter out some of the more obscure works, often doujinshi and hentai, which sometimes take much longer to be added to the database, if they are added at all. I'm particularly interested in filtering out doujinshi and hentai because they sometimes have really long (2-3 lines) or gross names, and it's frustrating that they evade the release filters I set up because they aren't in the database yet.

2. I suggest allowing us to filter by media type

Mostly would be useful for filtering out novels, for those who are only interested in manga, manhwa etc.

Also, is there a way to see a list of all the groups you've filtered from the release page?

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I like the filtering by media type very much. As many novels as there are being scanned, it would be super awesome if we could somehow filter those. Second on the group blocked list as well.