So here is the problem description. I had an Airthings device that needed to be replaced (RMA). However, the new device of course has different identifiers such as serial number. HA has created new entities for this device, and retained the old entities with an error/warning message that the integration is not longer providing this device/entity. Now, I want to merge these devices… either a) add the new S/N as an identifier to the old entity or b) simply select both items in the entity list which are the same, and click a combine button… letting me decide which is the correct new entity. I noticed someone else had a similar issue depicted at Add ability to manually merge duplicate devices however, I do not know enough about the underpinnings of HA to start mucking with adding a custom identifier that is common to both devices and/or entities. So, definitely looking at some guidance, as I am sure many people have to RMA sensors and whatnot and want to see one single graph of lets say Radon level for the year… instead of 2 graphs (old device entity that is the dead unit, and new device entity that is the current unit).
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unfortunatly i have pretty much given up on this happening
I don’t know if that’ll help, but I found this integration while looking to solve this problem.
It is still actively maintained if I look at the commits from his GitHub repo.