/***********************************************************************************************************************************************************************
 * File Name: plan_lessons.mdl.js
 * Type of Program: Model
 * Description: Junction table — links standalone Lessons to a specific tier plan.
 *              Composite UNIQUE on (plan_id, lesson_id) only prevents adding
 *              the same lesson twice to the same plan — a lesson may belong
 *              to many plans simultaneously (Tier Plans v2, silent duplication
 *              across bundles is intentional; see admin/tiers.controller.js).
 *              Mirrors plan_courses.mdl.js — bundling/display only, not an
 *              access-control mechanism (see canAccessLesson / user_tier_grants).
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Aug. 1, 2026
 ***********************************************************************************************************************************************************************/
const { DataTypes } = require('sequelize');
const sequelize = require('../../config/db.config');

const mdl_PlanLessons = sequelize.define('PlanLesson', {
  id:        { type: DataTypes.BIGINT, primaryKey: true, autoIncrement: true },
  plan_id:   { type: DataTypes.BIGINT, allowNull: false },
  lesson_id: { type: DataTypes.BIGINT, allowNull: false },
}, {
  tableName:  'plan_lessons',
  timestamps: true,
  paranoid:   false,
});

module.exports = mdl_PlanLessons;