do $$
begin
  if exists (
    select 1
    from information_schema.columns
    where table_schema = 'public'
      and table_name = 'patient_patient_tag'
      and column_name = 'patient_tag_id'
  )
  and not exists (
    select 1
    from information_schema.columns
    where table_schema = 'public'
      and table_name = 'patient_patient_tag'
      and column_name = 'tag_id'
  ) then
    alter table public.patient_patient_tag
      rename column patient_tag_id to tag_id;
  end if;
end $$;