text: 'use strict';
  
  module.exports = {
    up: function (queryInterface, Sequelize) {
      return queryInterface.addColumn(
          'tasks',
          'completedAt',
          {
            allowNull: true,
            type: Sequelize.DATE
          }
      );
    },
  
    down: function (queryInterface, Sequelize) {
      return queryInterface.removeColumn(
          'tasks',
          'completedAt'
      );
    }
  };
  