Added MemberPaymentEvent model

refs https://github.com/TryGhost/Ghost/issues/12602

- Adds the aggregatePaymentVolume option to the `findAll` method,
allowing us to calculate volume over time

core/server/models/index.js

@@ -29,6 +29,7 @@ const models = [
     'mobiledoc-revision',
     'member',
     'member-subscribe-event',
+    'member-payment-event',
     'member-status-event',
     'posts-meta',
     'member-stripe-customer',

core/server/models/member-payment-event.js

@@ -0,0 +1,47 @@
+const errors = require('@tryghost/errors');
+const ghostBookshelf = require('./base');
+
+const MemberPaymentEvent = ghostBookshelf.Model.extend({
+    tableName: 'members_payment_events',
+    customQuery(qb, options) {
+        if (options.aggregatePaymentVolume) {
+            if (options.limit || options.filter) {
+                throw new errors.IncorrectUsageError('aggregatePaymentVolume does not work when passed a filter or limit');
+            }
+            const knex = ghostBookshelf.knex;
+            return qb.clear('select')
+                .select(knex.raw('DATE(created_at) as date'))
+                .select(knex.raw('SUM(amount) as gross_volume'))
+                .select('currency')
+                .groupByRaw('currency, DATE(created_at)')
+                .orderByRaw('DATE(created_at)');
+        }
+    }
+}, {
+    permittedOptions(methodName) {
+        const options = ghostBookshelf.Model.permittedOptions.call(this, methodName);
+
+        if (methodName === 'findAll') {
+            return options.concat('aggregatePaymentVolume');
+        }
+
+        return options;
+    },
+    async edit() {
+        throw new errors.IncorrectUsageError('Cannot edit MemberPaymentEvent');
+    },
+
+    async destroy() {
+        throw new errors.IncorrectUsageError('Cannot destroy MemberPaymentEvent');
+    }
+});
+
+const MemberPaymentEvents = ghostBookshelf.Collection.extend({
+    model: MemberPaymentEvent
+});
+
+module.exports = {
+    MemberPaymentEvent: ghostBookshelf.model('MemberPaymentEvent', MemberPaymentEvent),
+    MemberPaymentEvents: ghostBookshelf.collection('MemberPaymentEvents', MemberPaymentEvents)
+};
+

core/server/services/members/api.js

@@ -170,6 +170,7 @@ function createApiInstance(config) {
             StripeCustomerSubscription: models.StripeCustomerSubscription,
             Member: models.Member,
             MemberSubscribeEvent: models.MemberSubscribeEvent,
+            MemberPaymentEvent: models.MemberPaymentEvent,
             MemberStatusEvent: models.MemberStatusEvent
         },
         logger: logging