db/schema/0300_grp.sql

select create_newtype_text('public.grp_tag');

create table public.grp
  ( id       int             not null primary key generated always as identity
  , uid      human_uuid.huid not null unique default human_uuid.huid()
  , deleted  boolean         not null default false
  , tag      public.grp_tag  not null unique
  );

create function public.grp_admins()
  returns public.grp
  stable
  language sql
  as $$select * from public.grp where tag = public.grp_tag_of_string('admins')$$;

create function public.do_grp_add_admins()
  returns trigger
  volatile
  language plpgsql
  as $$
declare
  admins int[];
begin
  select array_agg(usr.id)
  from public.grp_members_admins() as usr
  into admins;

  perform public.grp_add_members( to_grp => NEW.id
                                , add_usrs => admins
                                );

  return null;
end;
$$;

create trigger grp_add_admins
after insert on public.grp
for each row
execute function public.do_grp_add_admins();

select audit( 'public'
            , 'grp'
            , array[] :: audited_column[]
            , soft_delete => true
            );

select immutable( 'public'
                , 'grp'
                , array[ 'id'
                       , 'uid'
                       , 'tag'
                       ]
                );