const db = require('../models'); const Users = db.users; const Alerts = db.alerts; const Tags = db.tags; const AlertsData = [ { message: 'New member signed up', }, { message: 'Profile updated by Jane Smith', }, { message: 'New tag created: AI', }, { message: 'User Bob Brown updated profile', }, ]; const TagsData = [ { name: 'Economics', category: 'Profession', }, { name: 'Finance', category: 'Profession', }, { name: 'Development', category: 'Profession', }, { name: 'Marketing', category: 'Expertise', }, ]; // Similar logic for "relation_many" module.exports = { up: async (queryInterface, Sequelize) => { await Alerts.bulkCreate(AlertsData); await Tags.bulkCreate(TagsData); await Promise.all([ // Similar logic for "relation_many" ]); }, down: async (queryInterface, Sequelize) => { await queryInterface.bulkDelete('alerts', null, {}); await queryInterface.bulkDelete('tags', null, {}); }, };