How do I clean up my notify settings and remove duplicate devices?

Configuration
1

I seem to have collected 4 or 5 extra devices in there and one of them is taking up the name that I’d like to use. How do I purge some/all of them?

Also just noticed another similar thing for the battery level as I should only have two:

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2

Anyone have any advice?

3

Look in known_devices.yaml and delete unwanted entries there.