Allow more than one user to be deleted 😂

server/migrations/20180708231200-serviceid-null.js

@@ -0,0 +1,14 @@
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.changeColumn('users', 'serviceId', {
+      type: Sequelize.STRING,
+      allowNull: true,
+    });
+  },
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.changeColumn('users', 'serviceId', {
+      type: Sequelize.STRING,
+      allowNull: false,
+    });
+  }
+}