PostgreSQL does not distinguish between users and roles: everything is a ROLE. The correct mental model, a real case, and a complete example to build a truly maintainable read-only account.
A client where every application user connected as the schema owner with the DBA role. How I restructured the Oracle security model by applying the principle of least privilege — with real SQL, custom roles and Unified Audit.
In MySQL and MariaDB a user's identity depends on the host they connect from. A real case, the authentication model explained in depth and the most common mistakes in access management.