Attempt to fix growth of _internal database in InfluxDB
Attempt to fix growth of _internal database in InfluxDB

Modifies setup script to directly create the monitor retention policy to
retain 2h. Hopefully this limits the size of the _internal database.

srinathava/raspberry-pi-sleep-monitor,srinathava/raspberry-pi-sleep-monitor,srinathava/raspberry-pi-sleep-monitor,srinathava/raspberry-pi-sleep-monitor