Built it with load cells (two per bed, HX711, ESP32) and the Rules card. Test last night with my supervisor lying on a spare bed and getting up at 23:10: the alarm opened at 23:20 and the carer got it in the chat app.
One thing I got wrong first: I left my old alarm rule on the profile switched on, so the 3 p.m. lounge alarms kept coming. Deleted it, only the Rules card is left. And Rachel, the manager is getting written consent from the families before we put the other two in.
Timestamps in UTC or it didn't happen.