Deferred pour to inactive tap eventually causes SyncManager to stop updating.

[scottresnik]

I'll see a bunch of entries like below at a regular interval:
02-09 17:29:00.874 D/SyncManager(28361): Processing 1 deferred pour.
02-09 17:29:00.874 W/LocalDbHelper(28361): getCurrentRow: pour
02-09 17:29:00.874 D/SyncManager(28361): >>> Posting pour: tap=kegboard.flow0 ticks=4830
02-09 17:29:00.884 D/Http (28361): --> GET https://kegbot.example.com/api/taps/ [200]
02-09 17:29:00.944 D/Http (28361): --> POST https://kegbot.example.com/api/taps/kegboard.flow0 [500]

Then between 1 and 2 hours later, that will stop, and the tablet will no longer be sending updates to the server.