I like that their server is just a single Go binary, but then they go and ruin that with a Node.js web UI and.. PostgreSQL?! Seems like complete overkill. I wonder what gripping limitations they faced with SQLite that they decided it needed PostgreSQL.
SQLite is still the default backend. Postgres is optional.
It looks like PostgreSQL is optional and SQLite is the default.
https://github.com/UNITRONIX/BetterDesk#prerequisites