* Put the user id filter inside the CTEs
One thing I forgot about Postgres CTEs is that they materialize the
entire CTE and the top-level query filters _that_.
* Use the correct column name
* Run user setting DUS per-user via Sidekiq
Doing it as a single query trips the query timeout beyond a certain
quantity of users.
* Run DataUpdateScripts::MigrateRelevantFieldsFromUsersToUsersNotificationSettings asynchronously