Masto.host on Nostr: Yep, your server is only 19 months old, so having 730 days in your 'Content cache ...

Yep, your server is only 19 months old, so having 730 days in your 'Content cache retention period' settings will have little to no impact.

Even 548 days will have little impact since that is pretty much the number of days the server has been live.

Finally, yes relays have exponentially inflated your database size. If you want to not have it growing at this rate, you should disable them.