Hi, I was doing some nasty stuff this morning, deleting users in the database (`DELETE FROM users`, `DELETE FROM identities`). _However_, this left some user data hanging in the `namespaces` table and gave me a hard-to-debug error when trying to recreate the user (because there was already a conflicting namespace record.) I know deleting data right in the database is not the best of ideas (...) but it still made me curious: there are many foreign key constraints that makes deletion of a `users` record also cascade to delete related data. Is there a particular reason why the associated namespace is not set up via a foreign key relation per se? (One obvious reason I can think of: namespaces can be connected to either a team or a user, so a proper foreign key relation is hard to set up in this case.)