refs https://github.com/TryGhost/Toolbox/issues/292
- When version missmatch handling is done in Ghost we need to store the 'Accept-Version' header values that have been already processed in the past (to avoid sending notifications about the same mismatch multiple times)
- The `version_notifications` will be storing an array with handled versions like so: `['v3.44', 'v4.23', 'v4.39']`.
- The emailing logic and processing is slightly similar to how "notification" key is handled, that's why I've placed the definition of this new key close by.
refs https://github.com/TryGhost/Team/issues/1520
- Sets the `offer_id` in the `members_stripe_customers_subscriptions` table based on the `offer_redemptions` that have the same tier and cadence
- We currently use the same subscription <-> offer linking when viewing a member
- The MySQL query is quite optimized in a single UPDATE query, but in SQLite we'll need to run (maximum) one UPDATE query for every offer (not per subscription).
- Best to merge this migration in 4.x (not in 5.0) because it is better (less error prone) to run this migration before starting to fill the offer_id field for updated migrations instead of after (https://github.com/TryGhost/Ghost/pull/14488)
- We need the SQLite migration for sites that will only migrate to MySQL at 5.0
refs https://github.com/TryGhost/Team/issues/1533
- Needed to create the read newsletter endpoint to make the newsletter resource more consistent with the other resources
- Read is available to admins like other newsletter actions