I import relays from relay hints, kind 2 and kind 3. I also track seen_by for events which uses a source relay reference.
The NIPs and real word differ a bit for relay data, however the new relay NIP which I haven’t looked at may be useful.
I have over 700 relays found. A few I need to de-dupe/clean the data for. Only 416 have successfully connected at least once.
At some point using my relay health checker, I’ll automate the aggregation to connect to health relays, even as they are discovered. But not all relays add value..