No way to permanently delete users, cases etc.

when you create user (with certain email and username) and then delete him,
user model goes to 'Deleted' tag. But there is no way to permanently delete him (only undelete).

This causes a problem, since you cannot create another user with the same username.

The same goes for every model in the system.

How do you PERMANENTLY delete user/case/set etc.?
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this problem