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

This is to just fetch the message, given it's message id.

This is for querying reasons, to see what is available.

This is to query broker for pending message ids (i.e. ones that
haven't yet started).