Re: database specific pg_read_all_data / pg_write_all_data

There are setups where roles can access multiple databases and in some of those they have read/write all privileges and in others they do not?

Fundamentally making group-role memberships per-database is a fundamental change that seems quite unappealing to attempt without a solid use case that it will enable.  iMO you’ve claims here do not establish a solid use case - they are lacking convincing details.  That said, the project is open source - you can scratch your own itch.  But the model change is still a complexity hill to overcome.

David J.