create index rsstg_post__posted_hour on rsstg_post(posted,hour);

create or replace view rsstg_order as
	select source_id, coalesce(last_scrape + make_interval(0,0,0,0,0,(60 / (coalesce(activity, 1)/7 + 1) )::integer), now() - interval '1 minute') as next_fetch
		from rsstg_source natural left join
		(select source_id, count(*) as activity
			from rsstg_post where 
				hour = extract('hour' from now())::smallint
				and posted > now() - interval '7 days'
			group by source_id) as act
		where enabled
		order by next_fetch;