Bit off-topic, but having played with HA a bit I always wonder if there is a general strategy on how to deal with failures, i.e. is there a way to make everything go to the default/safe mode in case things stop working? A watchdog-like backup system? And another backup for that :) I get that it's unlikely to happen, but still.. Like:

- some sensor triggers lights on via impuls relay (that's what I have to happen in my home), HA stops functioning, lights remain on. How to make sure instead they're turned off? I get that not using impuls relays but relays which need to be driven high constantly might be one step in the right direction, but that would still assume whatever line the relay is driven with is pulled low when HA stops functioning.

- you setup HA to instruct your home battery to charge during off-peak hours, HA stops functioning during off-peak, battery is left in 'charge as much as you want' state. Unless battery has functionality to tell it 'charge max x hours' it will try to keep charging, whereas it would be nicer if it wouldn't

- same for heating: leave for vacation, tell HA to put heating in low power mode but to start heating the house again in normal mode 3 days before I'm back (because that's roughly the amount of time needed with low temp heating to get everything warm again). HA stops, I come home to a cold house.