Delete registrations for a user if they're deleted?

Registration doesn't make a choice about whether content should be deleted, admins do. But your right, content should be deleted if admins make that decision.

Patch implements this, with tests.

Its up for debate. If a user is deleted and it did not author a registration, but is rather associated as user_uid. Should the registration be deleted?

I mentioned content because all content (entities owned by the user) are dealt with at once by the admin when they cancel an account. But for Registration, content = registrations.

Thanks @dpi, looks good and committed.

I am trying to delete registrations programmatically. I tried to use I registration_user_delete but this does not do what I want.
I need to get registration id and delete registration by id. Because this code deletes all registrations added by author. I mean if I added registrations for A person and added registration for myself also; and run your code, it will delete both registration A and my registration.

I used

if (isset($registration_id)) {
db_delete('registration')
->condition('registration_id', $registration_id)
->execute();
}
to delete by registration id. There should be another registration load function to load by entity id, entity type and user id

Please post a new issue in the future. It is obvious this function deletes a users registrations, it is also a core hook: hook_user_delete.

You should use entity_delete.