If you are evaluating whether the shared database is a good solution for you, consider Geneious Cloud as an alternative that requires no setup or ongoing administration of a server.
The attached document provides a step by step guide to setting up a Geneious Shared Database with direct SQL connection using PostgreSQL. This includes creating the database, adding database administrators and new users, and defining groups and roles. Shared databases have been tested with PostgreSQL versions 9-15.