Auwch, what happened. Lost my device

Hello,

I was playing with my hass instance:

  • rpi4
  • docker with
    • homeassistant
    • mqtt broker
    • zigbee2mqtt

Don’t know what I messed up but I can’t see my (mqtt)boiler anymore. Device + entities seem “unavailable”.
However

  • mqtt-broker up & running
  • boiler is sending mqtt messages.
  • other instances of hass on other devices, connected to same mqtt broker still see my boiler.

Is it possible to delete the device, but how to add it again? Boiler devices were added by autodiscovery…

No my dashboard looks sadly like…