I modified it to no longer store the information because when Gladys connects to the MQTT of Zigbee, it retrieves the devices in the z2m format and stores them.
So I reuse them, do the reverse mapping, to send the right message.
So it stays in RAM, and we are sure to have the latest fresh information, in case the z2m devices evolve.
@jparbel is trying to test the generated image atrovato/gladys:zigbee2mqtt
EDIT: Call to other motivated people to also test this new image (whether to test compatibility on new devices, or non-regression on those that already work), thank you all 