improve api for specifying recurring times

[pyramation]

I like what these guys did:
https://github.com/davbeck/graphile-scheduler

select graphile_scheduler.every_day();
select graphile_scheduler.every_month();

[pyramation]

CREATE OR REPLACE FUNCTION :GRAPHILE_SCHEDULER_SCHEMA.every_minute() RETURNS integer[] AS $$
	SELECT ARRAY_AGG(range) FROM GENERATE_SERIES(0,59) AS range;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION :GRAPHILE_SCHEDULER_SCHEMA.every_hour() RETURNS integer[] AS $$
	SELECT ARRAY_AGG(range) FROM GENERATE_SERIES(0,23) AS range;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION :GRAPHILE_SCHEDULER_SCHEMA.every_day() RETURNS integer[] AS $$
	SELECT ARRAY_AGG(range) FROM GENERATE_SERIES(1,31) AS range;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION :GRAPHILE_SCHEDULER_SCHEMA.every_month() RETURNS integer[] AS $$
	SELECT ARRAY_AGG(range) FROM GENERATE_SERIES(1,12) AS range;
$$ LANGUAGE SQL;

CREATE OR REPLACE FUNCTION :GRAPHILE_SCHEDULER_SCHEMA.every_dow() RETURNS integer[] AS $$
	SELECT ARRAY_AGG(range) FROM GENERATE_SERIES(0,7) AS range;
$$ LANGUAGE SQL;

[pyramation]

https://github.com/davbeck/graphile-scheduler/blob/master/sql/000001.sql

[pyramation]

they also have all cron fields: https://github.com/davbeck/graphile-scheduler/blob/master/src/parseCron.ts