dashboard: remember ai job correctness review history

[a-nogikh]

On the bug's page, display the history of job result changes.

[dvyukov]

I was thinking: do want this to be more generic "user action logging" thing so that we don't need to create table/helpers per each action? For example, we already have "bisection invalidation" button, we have reproducer submission to managers, now we also have AI job creation.
It could be a table with:

• entity type
• entity id
• action
• user
• date
• JSON with additional data

Then a single set of helpers to insert/retrieve actions for particular entity type/id.

[a-nogikh]

I am not sure we're going to have a great time journaling actions in Spanner for Datastore entities.

[dvyukov]

I am not sure we're going to have a great time journaling actions in Spanner for Datastore entities.

Why? Don't we just store a string ID, that's how we would store references in Datastore anyway.