alter table public.tenant_content_notifications
  drop constraint if exists tenant_content_notifications_notification_type_check;

alter table public.tenant_content_notifications
  add constraint tenant_content_notifications_notification_type_check
  check (notification_type in (
    'public_question_bank_synced',
    'public_question_bank_conflict',
    'public_question_bank_sync_failed'
  ));

create index if not exists idx_tenant_question_bank_adoptions_sync_ops
  on public.tenant_question_bank_adoptions(sync_status, updated_at desc)
  where sync_status in ('pending', 'failed');