Creates a simple table and attaches a trigger function that just sleeps 1s

simple_trigger_testcase.sql

create table t1(c1 int);

CREATE OR REPLACE FUNCTION public.t1_upd()
 RETURNS trigger
 LANGUAGE plpgsql
AS $function$
begin
perform pg_sleep(1);
return new;
end;
$function$;

create trigger t1_upd_trg after update or insert on t1 for each row execute procedure t1_upd();