QGIS thinks PostgreSQL columns are not ReadOnly even if the connected user has no update privilege on them

[strk]

What is the bug or the crash?

QGIS doesn't consider PostgreSQL privilege on table columns when determining editability

Steps to reproduce the issue

Run this in the PostgreSQL database:

create table t(id serial primary key, restricted_column text, g geometry);
grant insert(g) on t to qgis_test_unprivileged_user;

Create a layer against t, fetch fields, check .isReadOnly() on fields (or .isEditable() on feature fields).

All fields will result editable (not readonly) but none really is

Versions

Current master branch 77dfdfa

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

I've found this while working on GH-28835