Add the ability to set Deferrable/Deferred from console.

[abdullah2993]

The equivalent in pgAdmin is these two checks

right now we have to go and manually edit the generated migration to add DEFERRABLE INITIALLY DEFERRED.

Example Migration:

ALTER TABLE public.xxx
    ADD CONSTRAINT xxx_id_fkey FOREIGN KEY (y_id)
    REFERENCES public.yyy (id) MATCH SIMPLE
    ON UPDATE NO ACTION
    ON DELETE NO ACTION
    DEFERRABLE INITIALLY DEFERRED;

[LydiaF]

I think another good usecase for @defer could be when a model has a computed field that takes a while to formulate.

Thanks for consideration :)