some links if you want deep dive: Nadar check if your outbox has all your notes (kind 1)

NADAR

kagenui check your contatct relays outbox list

KAGENUI

Zombie Check if any of those you follow are no longer here.

Plebs vs. Zombies

Plebs vs. Zombies | Nostr Follow Manager

Clean up your Nostr follow list by identifying and removing dormant zombie accounts. Hunt zombies, manage follows, and keep your network alive!

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here's what the signature of this event says (it's probably very common)