improve logging; allow errors within poller to break everything; check for idleness only once per relation loop
improve logging; allow errors within poller to break everything; check for idleness only once per relation loop

harrystech/arthur-redshift-etl,harrystech/arthur-redshift-etl,harrystech/arthur-redshift-etl,harrystech/arthur-redshift-etl,harrystech/arthur-redshift-etl