Add keepalive SQL query to Notifier #1423
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Related to #1417
Add a noop SQL query every 10 seconds to keep the connection alive. I expect that this could surface more database exceptions that are currently being ignored because the socket isn't actually being exercised solely by running
wait_for_notify.I'm not sure if it matters if this is being run after
wait_for_notifyor if it should be before in the loop. Either way this loop should be fairly tight (once every second).