The main can close when nobody is home

A leak alert on a phone is not a shutoff. Floor sensors could scream and the line would keep running. Away most weeks. The old stack was notify-only. That is a house you hope someone is in.

Titan sits on the main. Its own probe closes the valve with no Home Assistant. Power dies, it fails closed — watched it do that on a breaker trip. HA only adds policy: a garage leak always, the rest of the house only when away, a flow meter if a burst stays stupid-high. After it closes, it stays closed until a person opens it.

Solved means water can stop when the house is empty. Not that the include worked.