alter table jobs add column job_posts_notified_1st boolean default false;
update jobs set job_posts_notified_1st = true;
alter table jobs add column job_posts_notified_2nd boolean default false;
update jobs set job_posts_notified_2nd = true;

create index jobs_job_posts_notified_1st_ind on jobs( job_posts_notified_1st );
create index jobs_job_posts_notified_2nd_ind on jobs( job_posts_notified_2nd );

