User Management plugin: per-database access and Percona PostgreSQL support

The User Management plugin v0.2.2 lands two upgrades in one release: finer-grained access control for PostgreSQL, and support for a new engine.

Per-database access control: a new InstanceDatabase resource declares a database and its owner, and users can now be granted read or readWrite scoped to a single database instead of the whole instance. CONNECT on each InstanceDatabase is restricted to explicitly granted users, and PostgreSQL extensions can be enabled per database rather than per instance. All of it is surfaced in a new Access tab in the UI, which groups Users and Databases in one place.

Percona PostgreSQL support: the plugin can now manage users and roles on Percona PostgreSQL clusters the same way as on any other supported engine — no more out-of-band administration for those clusters.

To learn more, visit the release notes.