Fixed existing members status properties

refs https://github.com/TryGhost/Team/issues/959

Since we had a bug where members with a canceled subscription would have
a status of 'comped' we must fix any existing members in this state.

We update all members which have no products to a status of 'free',
which is the definition of a 'free' member.

core/server/data/migrations/versions/4.12/02-fix-member-statuses.js

@@ -0,0 +1,38 @@
+const logging = require('@tryghost/logging');
+const {chunk: chunkArray} = require('lodash');
+const {createTransactionalMigration} = require('../../utils.js');
+
+module.exports = createTransactionalMigration(
+    async function up(knex) {
+        logging.info('Updating members with no products to "free"');
+
+        const freeMembers = await knex('members')
+            .select('members.id')
+            .leftJoin('members_products', 'members.id', 'members_products.member_id')
+            .where('members.status', '!=', 'free')
+            .whereNull('members_products.member_id');
+
+        if (freeMembers.length === 0) {
+            logging.info('No free members found');
+            return;
+        }
+
+        // SQLite >= 3.32.0 can support 32766 host parameters
+        // We use one for the SET clause, and the rest can be
+        // used to populate the WHERE IN (?... clause.
+        const chunkSize = 32765;
+
+        const freeMembersIds = freeMembers.map(row => row.id);
+
+        const chunks = chunkArray(freeMembersIds, chunkSize);
+
+        for (const chunk of chunks) {
+            await knex('members')
+                .update('status', 'free')
+                .whereIn('id', chunk);
+        }
+    },
+    async function down() {
+        logging.warn('Not reverting members to incorrect status');
+    }
+);