Ex-moderator stil receiving Blog report emails

[WorldCraft]

One of my ex-moderators (super moderator) has contacted me saying that he has been getting Blog report emails. He's been stripped of all advanced moderator permissions (both global and forum specific) and is only in the Registered group.

I went ahead and took a look at the blog_moderators table with phpmyadmin. For some reason, his userid is still entered into the table. Is it safe to delete the entry?

What also concerns me is that I notice that all of my old super-mods are still in the tables (moderator and blog_moderator). I can only assume they are receiving blog report emails as well. Does this mean that I will have to manually delete their database entries every time I remove a supermod from the usergroup?

My current understanding of how these 2 tables work, is that they keep track of their set permissions (since there will not be a table entry if you never edited their specific permissions). Shouldn't these delete themselves when the mod is removed from the usergroups?

Thanks.