Gateway institution configuration is not always present

[phavekes]

This issue is imported from pivotal - Originaly created at Aug 15, 2023 by Michiel Kodde

Scenario
Given: the SSO on 2FA feature is installed on an existing installation.
And: I run the migration that creates the Gateway projection schema
And: I configure one of the institutions to use SSO on 2FA
Then: the gateway institution configuration should be updated to reflect the configuration value

Problem
However: the projector does not create the projection row if it does not exist yet.

Solution
The best solution would be to run an event replay. Ensuring all institutions are present in the GW institution configuration projection.
The next best solution is to make the projector aware of the possibility, an institution is not yet projected. And let it create the row on the fly.

[pmeulen]

I seems we ran into this with OpenConext/Stepup-Gateway#468

The problem is that this behaviour is not be what developers expect. As mentioned this is behavour is explicitly coded in the projector. It is not wrong per-se.

The problem with the middleware projections in general is that their behaviour is not documented, other than in code.