Pg_cron crontab log issue
To schedule jobs from the db server we'll need to enable trust authentication in pg_hba.conf for the user running the cron job.
We'll also need to either run UPDATE cron.job SET nodename = '' to make pg_cron connect via a local (unix domain) socket or add host all all 127.0.0.1/32 in pg_hba.conf to allow access to the pg_cron background worker via a local TCP connection.

As a basic sanity check to see if logging is enabled, we run SELECT cron.schedule('* * * * *', 'SELECT 1') which will run SELECT 1 at the start of every minute and should show up in the regular postgres log.