starr-philproperties/database/migrations/20260101000047-create-announcement-junction-tables.js

'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('announcement_courses', {
      id: {
        type:          Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey:    true,
      },
      announcement_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'announcements', key: 'id' },
        onDelete:   'CASCADE',
      },
      course_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'courses', key: 'course_id' },
        onDelete:   'CASCADE',
      },
    });

    await queryInterface.addConstraint('announcement_courses', {
      fields: ['announcement_id', 'course_id'],
      type:   'unique',
      name:   'uq_announcement_courses',
    });

    await queryInterface.addIndex('announcement_courses', { fields: ['announcement_id'], name: 'idx_announcement_courses_ann_id' });
    await queryInterface.addIndex('announcement_courses', { fields: ['course_id'],       name: 'idx_announcement_courses_course_id' });

    await queryInterface.createTable('announcement_roles', {
      id: {
        type:          Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey:    true,
      },
      announcement_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'announcements', key: 'id' },
        onDelete:   'CASCADE',
      },
      role: {
        type:      Sequelize.STRING(50),
        allowNull: false,
      },
    });

    await queryInterface.addConstraint('announcement_roles', {
      fields: ['announcement_id', 'role'],
      type:   'unique',
      name:   'uq_announcement_roles',
    });

    await queryInterface.addIndex('announcement_roles', { fields: ['announcement_id'], name: 'idx_announcement_roles_ann_id' });

    await queryInterface.createTable('announcement_reads', {
      id: {
        type:          Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey:    true,
      },
      announcement_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'announcements', key: 'id' },
        onDelete:   'CASCADE',
      },
      user_id: {
        type:       Sequelize.BIGINT,
        allowNull:  false,
        references: { model: 'users', key: 'user_id' },
        onDelete:   'CASCADE',
      },
      read_at: {
        type:         Sequelize.DATE,
        allowNull:    false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
      },
    });

    await queryInterface.addConstraint('announcement_reads', {
      fields: ['announcement_id', 'user_id'],
      type:   'unique',
      name:   'uq_announcement_reads',
    });

    await queryInterface.addIndex('announcement_reads', { fields: ['announcement_id'], name: 'idx_announcement_reads_ann_id' });
    await queryInterface.addIndex('announcement_reads', { fields: ['user_id'],         name: 'idx_announcement_reads_user_id' });
  },

  async down(queryInterface) {
    await queryInterface.dropTable('announcement_reads');
    await queryInterface.dropTable('announcement_roles');
    await queryInterface.dropTable('announcement_courses');
  },
};