Not all user data cleared from DB when deleting an account

[gwynnarth]

• NodeBB version: 1.12.0
• NodeBB git hash: 9c4b2d9

Not sure if that's a bug or intentional:
Issue #6702 added two new fields to the database:
'user:' + userData.uid + ':usernames' and 'user:' + userData.uid + ':emails' but I don't see these fields being removed in User.deleteAccount() as a result there are "dangling" data after removing an account. Is this data needed for anything after the account was removed, or is this a simple oversight?

Thanks!