text: 
  module.exports = {
    up: (queryInterface, Sequelize) => {
      return queryInterface.bulkInsert('Roles', [
        { name: 'admin' },
        { name: 'teacher' },
        { name: 'student' }
      ], {});
    },
  
    down: (queryInterface, Sequelize) => {
      return queryInterface.bulkDelete('Roles',
        { name: ['admin', 'teacher', 'student'] });
    }
  };
  