starr-philproperties/apps/api/database/migrations/20270101000041-create-task-prerequisites.js

'use strict';

// Index names use a `tpq_` (task-prerequisite) prefix instead of the
// original migration's `tp_` prefix — the original names (idx_tp_task_id,
// idx_tp_prerequisite_task_id) collide with task_progress's own
// idx_tp_task_id (see 20270101000040). CockroachDB apparently tolerates
// duplicate index names across tables, but Postgres does not, so this is
// fixed here rather than replicated — flagged for Kenneth's awareness.
module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('task_prerequisites', {
      id:                   { type: Sequelize.UUID, defaultValue: Sequelize.UUIDV4, primaryKey: true },
      task_id:              { type: Sequelize.UUID, allowNull: false, references: { model: 'tasks', key: 'task_id' }, onDelete: 'CASCADE' },
      prerequisite_task_id: { type: Sequelize.UUID, allowNull: false, references: { model: 'tasks', key: 'task_id' }, onDelete: 'CASCADE' },
      createdAt:            { type: Sequelize.DATE, allowNull: false },
      updatedAt:            { type: Sequelize.DATE, allowNull: false },
    });

    await queryInterface.addIndex('task_prerequisites', { fields: ['task_id', 'prerequisite_task_id'], unique: true, name: 'uq_task_prerequisite' });
    await queryInterface.addIndex('task_prerequisites', { fields: ['task_id'], name: 'idx_tpq_task_id' });
    await queryInterface.addIndex('task_prerequisites', { fields: ['prerequisite_task_id'], name: 'idx_tpq_prerequisite_task_id' });
  },

  async down(queryInterface) {
    await queryInterface.dropTable('task_prerequisites');
  },
};