message: billing - invoice - add index -  field createdOn
diff: @@ -80,6 +80,7 @@ export default class MongoDBStorage {
  // Invoices
  await this.handleIndexesInCollection(tenantID, 'invoices', [
  { fields: { invoiceID: 1 }, options: { unique: true } },
  + { fields: { createdOn: 1 } },
  ]);
  // Logs
  await this.handleIndexesInCollection(tenantID, 'logs', [
  