Migrated comped members to 'comped' status

refs https://github.com/TryGhost/Team/issues/790

In order to track when a member was comped, as well as to differentiate
paid members from comped, we are reintroducing the 'comped' status. This
migration will updated members with a Complimentary Stripe Subscription
to a status of 'comped'. It is essentially a reversal of the 4.6
migration.

core/server/data/migrations/versions/4.9/06-add-comped-status.js

@@ -0,0 +1,46 @@
+const logging = require('@tryghost/logging');
+const {createTransactionalMigration} = require('../../utils.js');
+
+module.exports = createTransactionalMigration(
+    async function up(knex) {
+        const compedMemberIds = (await knex('members')
+            .select('members.id')
+            .innerJoin(
+                'members_stripe_customers',
+                'members.id',
+                'members_stripe_customers.member_id'
+            ).innerJoin(
+                'members_stripe_customers_subscriptions',
+                function () {
+                    this.on(
+                        'members_stripe_customers.customer_id',
+                        'members_stripe_customers_subscriptions.customer_id'
+                    ).onIn(
+                        'members_stripe_customers_subscriptions.status',
+                        ['active', 'trialing', 'past_due', 'unpaid']
+                    );
+                }
+            ).where(
+                'members_stripe_customers_subscriptions.plan_nickname',
+                '=',
+                'Complimentary'
+            )).map(({id}) => id);
+
+        if (compedMemberIds.length === 0) {
+            logging.info('No Members found with Complimentary subscriptions');
+            return;
+        }
+
+        logging.info(`Updating ${compedMemberIds.length} Members status from 'paid' -> 'comped'`);
+
+        await knex('members')
+            .update('status', 'comped')
+            .whereIn('id', compedMemberIds);
+    },
+    async function down(knex) {
+        logging.info('Updating all member "comped" statuses to "paid"');
+        await knex('members')
+            .update('status', 'paid')
+            .where('status', 'comped');
+    }
+);