Noob here. Let's say I run my own relay and disconnect from all others. Will I see anyone else's posts? Or does the gossip thing need to be implemented for that?

Also what are your thoughts about expiring posts, to limit storage sizes? Then some kind of option where I can "save" posts to my own relay and act as a storage solution for that content as long as it is in my "save list" regardless of the time expiration?

This way we build more of a network similar to bitcoin, only the "correct" blocks are saved, similar to saved content from nostr- difference being it's just whatever content is saved by choice by the relays that will be accessible after the time expiration.