I use an Asus 86RU running Asus-Merlin. It ticks all of your boxes.

I’m not sure how I would do that. What sort of application would I use? Postgres doesn’t have a webui to log in through. So not sure how else I could test it.

Followed that guide. Got redis and postgresql14 installed. When installing immich I get an error in the log that says "error:password authentication failed for user “postgres”. I’ve trirled every combination of changing password, no passwords whatever. It never works.