Device-Class change not sticking

Configuration Z-Wave
1

I have an Everspring ST812 moisture sensor that doesn’t come in with a device type (so just on/off).
I can set the device_class: moisture in the Dev Tools for the binary sensor and for awhile it reflects correctly. Correct icon and wet/dry.
After an unknown period of time or an unknown action it’s back to not having a device_class.
When I first paired it the other day I did set up a mdi:water icon and I am removing that when setting the device_class. I’ve noticed that when it reverts, that icon is back.

Is setting the state in Dev Tools not a persistent change?

2

No, it is not.

You can change the device class for some entities by clicking on the entity (e.g. go to Devices, pick an entity) and customizing it in its settings:

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The other non-UI option is to assign the device class in configuration.yaml.

3

Thanks. I didn’t feel good about it since it is after all called “Developer Tools” but I wasn’t fully comprehending this page until you confirmed it. I see now that Configuration Variables = configuration file.

Continuing with this, what would be the recommended structure for a change like this if I want to keep it out of configuration.yaml?
Put it in a binary-sensors.yaml file?
You wouldn’t have a sample snippet, would you? Not quite to the point where I am able to make them from scratch and get the formatting correct.