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