How to set Last Rest field of entity config from a flow?

[evil-dog]

I have a sensor with state class "Total Increasing" that is based on data that resets daily. To make home assistant understand this and work properly I need to update the "Last Reset" field when this happens.

I have tried using the "Update Config" node passing in lastReset and last_reset with a manual string matching the format in the entity config editor. I've also tried passing it a Date object, and a Date.toLocaleString() formatted string, and an epoch number. None of them has updated the last reset date in the config.

I've tried glancing at the code to see how to do this, but have not yet seen that there is a way to do this.

[zachowj]

It appears the update config node was never designed to handle the last_reset attribute of the sensor node, and there’s no workaround to manually update this via the API node until the custom component releases a fix.

Additionally, when using a sensor with device_class set to "total increasing," I encounter the following error:

ValueError: Entity sensor.test_sensor (<class 'custom_components.nodered.sensor.NodeRedSensor'>) with state_class total_increasing has set last_reset. Setting last_reset for entities with state_class other than 'total' is not supported. Please update your configuration if state_class is manually configured.

This suggests that "total increasing" might not be the appropriate value for your use case.

For reference, here’s more information on the available state classes and their constraints:
Home Assistant Sensor State Classes Documentation

[evil-dog]

Ah crap, yes you know I bet that state class "Total Increasing" automatically takes care of the reset since it's not expected that the value would decrease without being reset. So HA can detect the reset without a separate signal. I had originally set these up with state class measurement (not understanding the diff between them) and when I tried to use them on the Energy dashboard it gave me an error about the last reset value. I researched the state classes and found I was indeed using the wrong one and switched to total increasing, but I wrongly assumed I still needed to have last reset set.

I do have some sensors I setup using the "Total" state class and would need to set the "last reset" date. But I'm not using them for anything yet, so I don't think it's a problem yet. However, I do think a way to trigger a reset or set the "last reset" field is needed.

Thanks for your help.