outline/server/migrations/20180708231200-serviceid-null.js

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,
    });
  }
}