If you do end up hosting on a VPS, consider one with renewable energy since tor nodes can consume a lot of power over time - or for home setups, you could run it off a portable power station to offset electricity costs (check out power station comparisons to find the best wh value for continous loads).

Just to clarify, VectorChord is actually the company that makes pgvecto.rs (the postgres vector extension), so you’re both talking about the same thing lol.

MPD (Music Player Daemon) would be perfect for that old Autonomic - super lightweight, runs on practically anythng, and Symfonium is an amazing Android client that supports it natively.