Whether at db initialization or upgrade time.
This step is actually done "systematically" manually by sysadm after an initialization or an upgrade.This now automatically grant read-only access to the guest user at db initialization or
upgrade time. This way, sysadm no longer have to manually alter the schema after
That way, sysadm won't have to be reminded to do it if they missed the step (I sometimes do forget it)initialization or upgrade.
Related to T4228