Domoticz

After a restart, for example after a power failure, all my outputs (GPIOs) are set to their last known state.
I'd rather like them to stay turned off consequently.
What is the best way to do so?

Additional background:

Im building up a controllsystem for a friends's terrarium.
One of its devices is a sprinkler, which must not spray for too long. This is a question of live and death for the terariums residents.
In case of a failure while the sprinkler is on, after restart the sprinkler stays on whithout turning of automaticly.