Sorry for the delay first of all, unfortunately I didn't get the notification of this thread If you are using a latching relay I'd recommend using SensorLatchingRelay1Pin or SensorLatchingRelay2Pins which should take better all the aspects of a latching relay. Then you can still use the safeguard for closing the door after a given timeframe. And yes you have to set a reporting interval even if not intuitive at all. This is because the safeguard is checked in the loop cycle which is called only if a reporting interval is set. So if you have a safeguard set to 1 minute, the report interval should be 1 minute or less. Thanks!
I have published all the documentation in a Github repository. If someone wants to make PCBs, I recommend that you wait a little longer until you receive my PCBs and try them.