Blog purge after some time

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Hi, can you develop (if not exist there yet) a plugin to purge never used blogs (or just for few posts)? like if a blog exist and has any update for more than 30 (editable) days and any post has been made on it, the blog is purged.

Also, if a blog exist and has any update for more than 60-90 days (editable) and has <= 3 (editable) posts the blog is purged.

What do you think? It shouldn’t be so hard