
When using a different database, the evaluation fails as `config.services.postgresql.package` is only set if `services.postgresql` is enabled. Also, the systemd service shouldn't have a relation to postgres if a remote database is used.
When using a different database, the evaluation fails as `config.services.postgresql.package` is only set if `services.postgresql` is enabled. Also, the systemd service shouldn't have a relation to postgres if a remote database is used.