no-issue
We're seeing problems with large sites taking a long time to run this
migration. The aim here is to refactor it so that it is faster to run.
We've achieved that by reducing the number of database queries needed,
firstly by selecting members with a join to their events (rather than
fetching the events on a member-by-member basis) we also batch the
necessary updates to further reduce db query time.
refs https://github.com/TryGhost/Team/issues/1000
Some free members were created with a status of 'comped', this resulted
in MemberStatusEvents being created with a `to_status` of 'comped'.
In 4.12 we fixed the status for all free members, but we did not update
the associated member_status_event.
* Migrated members comped status to reflect subscriptions
refs https://github.com/TryGhost/Team/issues/995
Due to a bug in subscription handling, members with Complimentary stripe
subscriptions were incorrectly given a status of 'paid'.
The goal of this migration is to fix existing broken members, and it
will be accompanied by a fix which prevents the bug for future members.
Since we are updating the status properties for members, we must ensure
that we also update the relevant member_status_events entries too, so
that we do not have incompatible sums between events and statuses.
For example, if we were to use events to graph comped members over time,
we would want the current count to match the query on statuses:
`SELECT COUNT(*) FROM members WHERE status='comped';`
