create or replace function ms_mv_orders_ut() returns trigger
security definer language 'plpgsql' as $$
begin
  if old.movie_showtime_id != new.movie_showtime_id then
    perform movie_showtimes_invalidate_row(old.movie_showtime_id);
    perform movie_showtimes_invalidate_row(new.movie_showtime_id);
  end if;
  return null;
end
$$;
