set check_function_bodies = off;

CREATE OR REPLACE FUNCTION public.grp_add_members(to_grp integer, add_usrs integer[])
 RETURNS void
 LANGUAGE plpgsql
AS $function$
begin
  insert into public.grp_usr (grp, usr)
  select to_grp, usr_id
  from unnest(add_usrs) usr_id
  left join public.grp_usr gu on gu.usr = usr_id and gu.grp = to_grp
  where gu is null;
end;
$function$
;