Esto le dará la fecha límite:
select id,
title,
created_at + interval '1' day * claim_window as deadline
from projects
Alternativamente, la función make_interval
se puede utilizar:
select id,
title,
created_at + make_interval(days => claim_window) as deadline
from projects
Para obtener todos los proyectos cuya fecha límite haya terminado, use:
select *
from (
select id,
created_at + interval '1' day * claim_window as deadline
from projects
) t
where localtimestamp at time zone 'UTC' > deadline