Your individual shower habits might be predictable enough to if than your way to it with existing sensors.

If you track current draw on your boiler / water heater that would indicate a draw on hot water during time when you typically shower. You can add other checks for it to pass if you find too many false positives.

If you’re as glued to your phone as every one else alive atm a simple rfid / wireless charger or something you set your phone on when you strip for the shower triggering the event will likely be the most straight forward approach unless you bring your phone in the shower lol I’m occasionally guilty if the podcast is good enough 😅

Unless it bears fruit

You could certainly massage Grist into something that checks most of those boxes might have to get creative with widget fields to have people mark themselves as active on a given task. But similar to some advanced notion templates databases can back end most anything you can think of!

Thank you for these posts! Regrettably my laymen self got lost in the weeds trying to recreate the set up through a different distribution hahah but I’ve learned lots along the way :)