-- Albums gain an owner: the tenancy root. Photos, shares, ratings and tags
-- all hang off albums, so this single column scopes everything.
alter table albums add column owner_id uuid references users(id);

-- Existing albums belong to the instance's original photographer.
update albums set owner_id = (select id from users order by created_at limit 1);

alter table albums alter column owner_id set not null;

create index albums_owner_idx on albums (owner_id);