(it can create table on it's own, spawn tasks, clean up, perform aggregation)

This is better for timeouts, since it supports delays larger than ~30 minutes.

This uses PGMQ and a short-lived table with random name.

periodic task added to demo app

Demo: 'echo' job is archived

It is not well thought-out

haskell-bee, haskell-bee-tests, haskell-bee-pgmq, haskell-bee-redis,
haskell-bee-stm

Add NFData instances

See merge request !2