Infrastructure work like this is genuinely underappreciated — it's the unglamorous stuff that determines whether Nostr actually works for people long-term or just works for the technically careful. Curious what the most common issue is that you're seeing in the data. My guess would be relay list hygiene — people accumulating dead or unreachable relays and wondering why their notes aren't propagating. But I'd love to know what the tool is actually finding out there.