feat: Add comprehensive API usage examples for v3, ERD, data dictionary, and course cloning documentation.

docs/api-docs/ER/ERD_v3_improved.txt

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+// E-Learning Platform - Enhanced ERD v3.0
+// Major improvements:
+// 1. Separated roles table with display values
+// 2. Separated user_profiles table
+// 3. Added created_by/updated_by audit trails
+// 4. Made updated_at/updated_by nullable
+// 5. Used ENUM for status fields
+// 6. Optimized audit trail placement
+// 7. Added announcement status and multi-instructor support
+
+// ============================================
+// CORE TABLES
+// ============================================
+
+Table roles {
+  id int [pk, increment]
+  code varchar [unique, not null, note: 'ADMIN | INSTRUCTOR | STUDENT']
+  name jsonb [not null, note: '{"th": "ผู้ดูแลระบบ", "en": "Administrator"}']
+  description jsonb [note: 'role description']
+  created_at datetime [not null, default: `now()`]
+  
+  indexes {
+    code [unique]
+  }
+}
+
+Table users {
+  id int [pk, increment]
+  username varchar [unique, not null]
+  email varchar [unique, not null]
+  password varchar [not null]
+  role_id int [not null, ref: > roles.id]
+  email_verified_at datetime
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  indexes {
+    username [unique]
+    email [unique]
+    role_id
+  }
+}
+
+Table user_profiles {
+  id int [pk, increment]
+  user_id int [unique, not null, ref: > users.id]
+  prefix varchar [note: 'Mr. | Mrs. | Ms. | Dr. etc.']
+  first_name varchar [not null]
+  last_name varchar [not null]
+  phone varchar
+  avatar_url varchar
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  updated_by int [ref: > users.id]
+  
+  indexes {
+    user_id [unique]
+  }
+}
+
+Table categories { 
+  id int [pk, increment]
+  name jsonb [not null, note: 'multi-language category name']
+  slug varchar [unique, not null]
+  description jsonb
+  icon varchar [note: 'icon identifier']
+  sort_order int [not null, default: 0]
+  is_active boolean [not null, default: true]
+  created_at datetime [not null, default: `now()`]
+  created_by int [not null, ref: > users.id]
+  updated_at datetime
+  updated_by int [ref: > users.id]
+  
+  indexes {
+    slug [unique]
+    is_active
+    sort_order
+  }
+}
+
+// ============================================
+// COURSE STRUCTURE
+// ============================================
+
+Table courses {
+  id int [pk, increment]
+  category_id int [ref: > categories.id]
+  title jsonb [not null, note: '{"th": "...", "en": "..."}']
+  slug varchar [unique, not null]
+  description jsonb
+  thumbnail_url varchar
+  price decimal [not null, default: 0, note: 'must be >= 0']
+  is_free boolean [not null, default: false]
+  have_certificate boolean [not null, default: false, note: 'issue certificate upon completion']
+  status varchar [not null, default: 'DRAFT', note: 'ENUM: DRAFT | PENDING | APPROVED | REJECTED | ARCHIVED']
+  approved_by int [ref: > users.id, note: 'admin user id']
+  approved_at datetime
+  rejection_reason varchar
+  created_at datetime [not null, default: `now()`]
+  created_by int [not null, ref: > users.id, note: 'primary instructor']
+  updated_at datetime
+  updated_by int [ref: > users.id]
+  
+  indexes {
+    category_id
+    slug [unique]
+    status
+    created_by
+    (status, is_free)
+    (category_id, status)
+  }
+}
+
+Table course_instructors {
+  id int [pk, increment]
+  course_id int [not null, ref: > courses.id]
+  user_id int [not null, ref: > users.id]
+  is_primary boolean [not null, default: false, note: 'primary instructor']
+  joined_at datetime [not null, default: `now()`]
+  
+  indexes {
+    (course_id, user_id) [unique]
+    course_id
+    user_id
+    is_primary
+  }
+}
+
+Table chapters {
+  id int [pk, increment]
+  course_id int [not null, ref: > courses.id]
+  title jsonb [not null, note: 'multi-language']
+  description jsonb
+  sort_order int [not null, default: 0, note: 'must be >= 0']
+  is_published boolean [not null, default: false]
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  Note: 'No created_by/updated_by - use course audit trail'
+  
+  indexes {
+    course_id
+    (course_id, sort_order)
+  }
+}
+
+Table lessons {
+  id int [pk, increment]
+  chapter_id int [not null, ref: > chapters.id]
+  title jsonb [not null, note: 'multi-language']
+  content jsonb [note: 'multi-language lesson content']
+  type varchar [not null, note: 'ENUM: VIDEO QUIZ']
+  duration_minutes int [note: 'estimated duration']
+  sort_order int [not null, default: 0, note: 'must be >= 0']
+  is_sequential boolean [not null, default: true]
+  prerequisite_lesson_ids jsonb [note: 'array of lesson IDs [1, 2, 3]']
+  require_pass_quiz boolean [default: false]
+  is_published boolean [not null, default: false]
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  Note: 'No created_by/updated_by - use course audit trail'
+  
+  indexes {
+    chapter_id
+    (chapter_id, sort_order)
+    type
+  }
+}
+
+// ============================================
+// QUIZ SYSTEM
+// ============================================
+
+Table quizzes {
+  id int [pk, increment]
+  lesson_id int [not null, ref: > lessons.id]
+  title jsonb [not null, note: 'multi-language']
+  description jsonb
+  passing_score int [not null, default: 60, note: 'must be 0-100']
+  time_limit int [note: 'in minutes, must be > 0 if set']
+  shuffle_questions boolean [not null, default: false]
+  shuffle_choices boolean [not null, default: false]
+  show_answers_after_completion boolean [not null, default: true, note: 'show correct answers after quiz completion']
+  created_at datetime [not null, default: `now()`]
+  created_by int [not null, ref: > users.id]
+  updated_at datetime
+  updated_by int [ref: > users.id]
+  
+  indexes {
+    lesson_id
+  }
+}
+
+Table questions {
+  id int [pk, increment]
+  quiz_id int [not null, ref: > quizzes.id]
+  question jsonb [not null, note: 'multi-language']
+  explanation jsonb [note: 'answer explanation']
+  question_type varchar [not null, default: 'MULTIPLE_CHOICE', note: 'ENUM: MULTIPLE_CHOICE | TRUE_FALSE | SHORT_ANSWER']
+  score int [not null, default: 1, note: 'must be > 0']
+  sort_order int [not null, default: 0]
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  Note: 'No created_by/updated_by - saved with quiz'
+  
+  indexes {
+    quiz_id
+    (quiz_id, sort_order)
+  }
+}
+
+Table choices {
+  id int [pk, increment]
+  question_id int [not null, ref: > questions.id]
+  text jsonb [not null, note: 'multi-language']
+  is_correct boolean [not null, default: false]
+  sort_order int [not null, default: 0]
+  indexes {
+    question_id
+  }
+}
+
+// ============================================
+// STUDENT PROGRESS
+// ============================================
+
+Table enrollments {
+  id int [pk, increment]
+  user_id int [not null, ref: > users.id]
+  course_id int [not null, ref: > courses.id]
+  status varchar [not null, default: 'ENROLLED', note: 'ENUM: ENROLLED | IN_PROGRESS | COMPLETED | DROPPED']
+  progress_percentage int [not null, default: 0, note: '0-100']
+  enrolled_at datetime [not null, default: `now()`]
+  started_at datetime [note: 'first lesson access']
+  completed_at datetime
+  last_accessed_at datetime
+  
+  Note: 'No created_by/updated_by - system managed'
+  
+  indexes {
+    (user_id, course_id) [unique, name: 'unique_enrollment']
+    user_id
+    course_id
+    status
+    last_accessed_at
+  }
+}
+
+
+Table certificates {
+  id int [pk, increment]
+  user_id int [not null, ref: > users.id]
+  course_id int [not null, ref: > courses.id]
+  enrollment_id int [unique, not null, ref: > enrollments.id]
+  file_path varchar [not null, note: 'S3 path to certificate PDF']
+  issued_at datetime [not null, default: `now()`]
+  
+  indexes {
+    user_id
+    course_id
+    enrollment_id [unique]
+    (user_id, course_id)
+  }
+}
+
+
+Table lesson_progress {
+  id int [pk, increment]
+  user_id int [not null, ref: > users.id]
+  lesson_id int [not null, ref: > lessons.id]
+  is_completed boolean [not null, default: false]
+  completed_at datetime
+  video_progress_seconds int [default: 0]
+  video_duration_seconds int
+  video_progress_percentage decimal(5,2)
+  last_watched_at datetime
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  Note: 'No created_by/updated_by - student action only'
+  
+  indexes {
+    (user_id, lesson_id) [unique]
+    user_id
+    lesson_id
+    last_watched_at
+  }
+}
+
+Table quiz_attempts {
+  id int [pk, increment]
+  user_id int [not null, ref: > users.id]
+  quiz_id int [not null, ref: > quizzes.id]
+  score int [not null, default: 0, note: '0-100']
+  total_questions int [not null]
+  correct_answers int [not null, default: 0]
+  is_passed boolean [not null, default: false]
+  attempt_number int [not null, default: 1]
+  answers jsonb [note: 'student answers for review']
+  started_at datetime [not null, default: `now()`]
+  completed_at datetime
+  
+  Note: 'No updated_at - attempts are immutable after completion'
+  
+  indexes {
+    user_id
+    quiz_id
+    (user_id, quiz_id)
+    (user_id, quiz_id, attempt_number)
+  }
+}
+
+// ============================================
+// COMMUNICATION
+// ============================================
+
+Table announcements {
+  id int [pk, increment]
+  course_id int [not null, ref: > courses.id]
+  title jsonb [not null, note: 'multi-language']
+  content jsonb [not null, note: 'multi-language']
+  status varchar [not null, default: 'DRAFT', note: 'ENUM: DRAFT | PUBLISHED | ARCHIVED']
+  is_pinned boolean [not null, default: false]
+  published_at datetime [note: 'scheduled publish date']
+  created_at datetime [not null, default: `now()`]
+  created_by int [not null, ref: > users.id]
+  updated_at datetime
+  updated_by int [ref: > users.id]
+  
+  indexes {
+    course_id
+    created_by
+    status
+    (course_id, status, is_pinned, published_at)
+  }
+}
+
+Table announcement_attachments {
+  id int [pk, increment]
+  announcement_id int [not null, ref: > announcements.id]
+  file_name varchar [not null]
+  file_path varchar [not null, note: 'S3 key']
+  file_size int [not null, note: 'bytes']
+  mime_type varchar [not null]
+  created_at datetime [not null, default: `now()`]
+  
+  Note: 'No updated_at - attachments are immutable'
+  
+  indexes {
+    announcement_id
+  }
+}
+
+Table lesson_attachments {
+  id int [pk, increment]
+  lesson_id int [not null, ref: > lessons.id]
+  file_name varchar [not null]
+  file_path varchar [not null, note: 'S3 key']
+  file_size int [not null, note: 'bytes']
+  mime_type varchar [not null]
+  description jsonb [note: 'multi-language']
+  sort_order int [not null, default: 0]
+  created_at datetime [not null, default: `now()`]
+  
+  Note: 'No updated_at - use lesson audit trail'
+  
+  indexes {
+    lesson_id
+    (lesson_id, sort_order)
+  }
+}
+
+// ============================================
+// PAYMENT SYSTEM (Future)
+// ============================================
+
+Table orders {
+  id int [pk, increment]
+  user_id int [not null, ref: > users.id]
+  total_amount decimal [not null, default: 0]
+  status varchar [not null, default: 'PENDING', note: 'ENUM: PENDING | PAID | CANCELLED | REFUNDED']
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  indexes {
+    user_id
+    status
+    (user_id, status)
+  }
+}
+
+Table order_items {
+  id int [pk, increment]
+  order_id int [not null, ref: > orders.id]
+  course_id int [not null, ref: > courses.id]
+  price decimal [not null]
+  created_at datetime [not null, default: `now()`]
+  
+  indexes {
+    order_id
+    course_id
+  }
+}
+
+Table payments {
+  id int [pk, increment]
+  order_id int [not null, ref: > orders.id]
+  provider varchar [not null, note: 'stripe | paypal | promptpay']
+  transaction_id varchar [unique]
+  amount decimal [not null]
+  status varchar [not null, default: 'PENDING', note: 'ENUM: PENDING | SUCCESS | FAILED']
+  paid_at datetime
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  indexes {
+    order_id
+    transaction_id [unique]
+    status
+  }
+}
+
+Table instructor_balances {
+  id int [pk, increment]
+  instructor_id int [not null, unique, ref: > users.id]
+  available_amount decimal [not null, default: 0]
+  withdrawn_amount decimal [not null, default: 0]
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  
+  indexes {
+    instructor_id [unique]
+  }
+}
+
+Table withdrawal_requests {
+  id int [pk, increment]
+  instructor_id int [not null, ref: > users.id]
+  amount decimal [not null]
+  status varchar [not null, default: 'PENDING', note: 'ENUM: PENDING | APPROVED | REJECTED | PAID']
+  approved_by int [ref: > users.id]
+  approved_at datetime
+  rejected_reason varchar
+  created_at datetime [not null, default: `now()`]
+  updated_at datetime
+  updated_by int [ref: > users.id]
+  
+  indexes {
+    instructor_id
+    status
+    (instructor_id, status)
+  }
+}
+
+// ============================================
+// NOTES & BEST PRACTICES
+// ============================================
+
+// 1. ENUM Status Values:
+//    - courses: DRAFT | PENDING | APPROVED | REJECTED | ARCHIVED
+//    - enrollments: ENROLLED | IN_PROGRESS | COMPLETED | DROPPED
+//    - announcements: DRAFT | PUBLISHED | ARCHIVED
+//    - orders: PENDING | PAID | CANCELLED | REFUNDED
+//    - payments: PENDING | SUCCESS | FAILED
+//    - withdrawals: PENDING | APPROVED | REJECTED | PAID
+//    - score_policy: HIGHEST | LATEST | FIRST | AVERAGE
+//    - lesson_type: VIDEO | PDF | TEXT | QUIZ
+//    - question_type: MULTIPLE_CHOICE | TRUE_FALSE | SHORT_ANSWER
+
+// 2. Audit Trail Strategy:
+//    - Full audit (created_by, updated_by): courses, quizzes, categories, announcements
+//    - Partial audit (created_by only): user_profiles
+//    - No audit: student actions (enrollments, progress, attempts)
+//    - No audit: child records saved with parent (questions, choices, chapters, lessons)
+
+// 3. Updated Fields:
+//    - updated_at is NULL on creation, only set when actually updated
+//    - updated_by is NULL on creation, only set when updated by someone
+
+// 4. Multi-Instructor Support:
+//    - course_instructors table allows multiple instructors per course
+//    - is_primary flag identifies main instructor
+//    - created_by in courses table is the original creator
+
+// 5. Role System:
+//    - roles table stores code (ADMIN) and display names ({"th": "ผู้ดูแลระบบ"})
+//    - Allows easy translation and role management
+//    - users.role_id references roles.id
+
+// 6. User Profiles:
+//    - Separated from users table for cleaner authentication
+//    - Contains display information (name, bio, avatar)
+//    - prefix field for Thai/international name prefixes
+
+// 7. Announcement Status:
+//    - DRAFT: not visible to students
+//    - PUBLISHED: visible to enrolled students
+//    - ARCHIVED: hidden but kept for history
+
+// 8. Foreign Key Actions:
+//    - users.role_id: RESTRICT (don't delete roles in use)
+//    - courses.created_by: RESTRICT (don't delete instructors with courses)
+//    - enrollments: CASCADE (delete with user/course)
+//    - announcements: CASCADE (delete with course)
+//    - quiz_attempts: CASCADE (delete with user)

docs/api-docs/ER/e_learning_data_dictionary - data_dictionary.csv

@@ -0,0 +1,205 @@
+table_name,column_name,data_type,size,is_nullable,is_primary_key,is_foreign_key,description
+roles,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+roles,code,VARCHAR,50,NO,NO,NO,รหัสบทบาท (ADMIN | INSTRUCTOR | STUDENT)
+roles,name,JSONB,,NO,NO,NO,ชื่อบทบาทหลายภาษา
+roles,description,JSONB,,YES,NO,NO,คำอธิบายบทบาท
+roles,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+users,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+users,username,VARCHAR,100,NO,NO,NO,ชื่อผู้ใช้สำหรับเข้าสู่ระบบ (ไม่ซ้ำ)
+users,email,VARCHAR,255,NO,NO,NO,อีเมล (ไม่ซ้ำ)
+users,password,VARCHAR,255,NO,NO,NO,รหัสผ่านที่เข้ารหัสแล้ว
+users,role_id,INTEGER,10,NO,NO,YES,อ้างอิงบทบาทผู้ใช้
+users,email_verified_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่ยืนยันอีเมล
+users,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+users,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+user_profiles,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+user_profiles,user_id,INTEGER,10,NO,NO,YES,อ้างอิงผู้ใช้ (ไม่ซ้ำ)
+user_profiles,prefix,VARCHAR,20,YES,NO,NO,"คำนำหน้าชื่อ enum(นาย, นาง, นางสาว, ดร.)"
+user_profiles,first_name,VARCHAR,100,NO,NO,NO,ชื่อจริง
+user_profiles,last_name,VARCHAR,100,NO,NO,NO,นามสกุล
+user_profiles,phone,VARCHAR,20,YES,NO,NO,เบอร์โทรศัพท์
+user_profiles,avatar_url,VARCHAR,500,YES,NO,NO,URL รูปโปรไฟล์
+user_profiles,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+user_profiles,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+user_profiles,updated_by,INTEGER,10,YES,NO,YES,ผู้ใช้ที่แก้ไขล่าสุด
+categories,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+categories,name,JSONB,,NO,NO,NO,ชื่อหมวดหมู่หลายภาษา
+categories,slug,VARCHAR,100,NO,NO,NO,ตัวระบุสำหรับ URL (ไม่ซ้ำ)
+categories,description,JSONB,,YES,NO,NO,คำอธิบายหลายภาษา
+categories,icon,VARCHAR,100,YES,NO,NO,ตัวระบุไอคอน
+categories,sort_order,INTEGER,10,NO,NO,NO,ลำดับการแสดงผล
+categories,is_active,BOOLEAN,,NO,NO,NO,สถานะเปิดใช้งาน
+categories,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+categories,created_by,INTEGER,10,NO,NO,YES,ผู้สร้าง
+categories,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+categories,updated_by,INTEGER,10,YES,NO,YES,ผู้แก้ไขล่าสุด
+courses,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+courses,category_id,INTEGER,10,YES,NO,YES,อ้างอิงหมวดหมู่
+courses,title,JSONB,,NO,NO,NO,ชื่อคอร์สหลายภาษา
+courses,slug,VARCHAR,200,NO,NO,NO,ตัวระบุสำหรับ URL (ไม่ซ้ำ)
+courses,description,JSONB,,YES,NO,NO,คำอธิบายคอร์สหลายภาษา
+courses,thumbnail_url,VARCHAR,500,YES,NO,NO,URL รูปปกคอร์ส
+courses,price,"DECIMAL(10,2)",,NO,NO,NO,ราคาคอร์ส (ต้อง >= 0)
+courses,is_free,BOOLEAN,,NO,NO,NO,คอร์สฟรี
+courses,have_certificate,BOOLEAN,,NO,NO,NO,ออกใบประกาศนียบัตรเมื่อจบ
+courses,status,VARCHAR,20,NO,NO,NO,"สถานะ enum(DRAFT, PENDING, APPROVED, REJECTED, ARCHIVED)"
+courses,approved_by,INTEGER,10,YES,NO,YES,ผู้ดูแลที่อนุมัติ
+courses,approved_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่อนุมัติ
+courses,rejection_reason,TEXT,,YES,NO,NO,เหตุผลที่ปฏิเสธ
+courses,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+courses,created_by,INTEGER,10,NO,NO,YES,ผู้สอนหลัก
+courses,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+courses,updated_by,INTEGER,10,YES,NO,YES,ผู้แก้ไขล่าสุด
+course_instructors,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+course_instructors,course_id,INTEGER,10,NO,NO,YES,อ้างอิงคอร์ส
+course_instructors,user_id,INTEGER,10,NO,NO,YES,อ้างอิงผู้สอน
+course_instructors,is_primary,BOOLEAN,,NO,NO,NO,ผู้สอนหลัก
+course_instructors,joined_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่เข้าร่วม
+chapters,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+chapters,course_id,INTEGER,10,NO,NO,YES,อ้างอิงคอร์ส
+chapters,title,JSONB,,NO,NO,NO,ชื่อบทหลายภาษา
+chapters,description,JSONB,,YES,NO,NO,คำอธิบายบทหลายภาษา
+chapters,sort_order,INTEGER,10,NO,NO,NO,ลำดับการแสดงผล (ต้อง >= 0)
+chapters,is_published,BOOLEAN,,NO,NO,NO,สถานะเผยแพร่
+chapters,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+chapters,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+lessons,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+lessons,chapter_id,INTEGER,10,NO,NO,YES,อ้างอิงบท
+lessons,title,JSONB,,NO,NO,NO,ชื่อบทเรียนหลายภาษา
+lessons,content,JSONB,,YES,NO,NO,เนื้อหาบทเรียนหลายภาษา
+lessons,type,VARCHAR,20,NO,NO,NO,"ประเภทบทเรียน (VIDEO, QUIZ)"
+lessons,duration_minutes,INTEGER,10,YES,NO,NO,ระยะเวลาโดยประมาณ (นาที)
+lessons,sort_order,INTEGER,10,NO,NO,NO,ลำดับการแสดงผล (ต้อง >= 0)
+lessons,is_sequential,BOOLEAN,,NO,NO,NO,ต้องเรียนตามลำดับ
+lessons,prerequisite_lesson_ids,JSONB,,YES,NO,NO,รายการ ID บทเรียนที่ต้องเรียนก่อน
+lessons,require_pass_quiz,BOOLEAN,,YES,NO,NO,ต้องผ่านแบบทดสอบก่อนดำเนินการต่อ
+lessons,is_published,BOOLEAN,,NO,NO,NO,สถานะเผยแพร่
+lessons,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+lessons,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+quizzes,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+quizzes,lesson_id,INTEGER,10,NO,NO,YES,อ้างอิงบทเรียน
+quizzes,title,JSONB,,NO,NO,NO,ชื่อแบบทดสอบหลายภาษา
+quizzes,description,JSONB,,YES,NO,NO,คำอธิบายแบบทดสอบหลายภาษา
+quizzes,passing_score,INTEGER,10,NO,NO,NO,คะแนนผ่าน (0-100)
+quizzes,time_limit,INTEGER,10,YES,NO,NO,เวลาจำกัด (นาที ต้อง > 0 ถ้ากำหนด)
+quizzes,shuffle_questions,BOOLEAN,,NO,NO,NO,สุ่มลำดับคำถาม
+quizzes,shuffle_choices,BOOLEAN,,NO,NO,NO,สุ่มลำดับตัวเลือก
+quizzes,show_answers_after_completion,BOOLEAN,,NO,NO,NO,แสดงเฉลยหลังทำเสร็จ
+quizzes,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+quizzes,created_by,INTEGER,10,NO,NO,YES,ผู้สร้าง
+quizzes,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+quizzes,updated_by,INTEGER,10,YES,NO,YES,ผู้แก้ไขล่าสุด
+questions,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+questions,quiz_id,INTEGER,10,NO,NO,YES,อ้างอิงแบบทดสอบ
+questions,question,JSONB,,NO,NO,NO,ข้อความคำถามหลายภาษา
+questions,explanation,JSONB,,YES,NO,NO,คำอธิบายเฉลยหลายภาษา
+questions,question_type,VARCHAR,20,NO,NO,NO,"ประเภทคำถาม enum(MULTIPLE_CHOICE, TRUE_FALSE, SHORT_ANSWER)"
+questions,score,INTEGER,10,NO,NO,NO,คะแนนสำหรับคำตอบที่ถูก (ต้อง > 0)
+questions,sort_order,INTEGER,10,NO,NO,NO,ลำดับการแสดงผล
+questions,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+questions,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+choices,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+choices,question_id,INTEGER,10,NO,NO,YES,อ้างอิงคำถาม
+choices,text,JSONB,,NO,NO,NO,ข้อความตัวเลือกหลายภาษา
+choices,is_correct,BOOLEAN,,NO,NO,NO,คำตอบที่ถูกต้อง
+choices,sort_order,INTEGER,10,NO,NO,NO,ลำดับการแสดงผล
+enrollments,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+enrollments,user_id,INTEGER,10,NO,NO,YES,อ้างอิงนักเรียน
+enrollments,course_id,INTEGER,10,NO,NO,YES,อ้างอิงคอร์ส
+enrollments,status,VARCHAR,20,NO,NO,NO,"สถานะ enum(ENROLLED, IN_PROGRESS, COMPLETED, DROPPED)"
+enrollments,progress_percentage,INTEGER,10,NO,NO,NO,เปอร์เซ็นต์ความคืบหน้า (0-100)
+enrollments,enrolled_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่ลงทะเบียน
+enrollments,started_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่เข้าเรียนครั้งแรก
+enrollments,completed_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่เรียนจบ
+enrollments,last_accessed_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่เข้าใช้ล่าสุด
+certificates,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+certificates,user_id,INTEGER,10,NO,NO,YES,อ้างอิงนักเรียน
+certificates,course_id,INTEGER,10,NO,NO,YES,อ้างอิงคอร์ส
+certificates,enrollment_id,INTEGER,10,NO,NO,YES,อ้างอิงการลงทะเบียน (ไม่ซ้ำ)
+certificates,file_path,VARCHAR,500,NO,NO,NO,เส้นทาง S3 ไฟล์ PDF ใบประกาศนียบัตร
+certificates,issued_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่ออกใบประกาศนียบัตร
+lesson_progress,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+lesson_progress,user_id,INTEGER,10,NO,NO,YES,อ้างอิงนักเรียน
+lesson_progress,lesson_id,INTEGER,10,NO,NO,YES,อ้างอิงบทเรียน
+lesson_progress,is_completed,BOOLEAN,,NO,NO,NO,สถานะเรียนจบ
+lesson_progress,completed_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่เรียนจบ
+lesson_progress,video_progress_seconds,INTEGER,10,YES,NO,NO,ความคืบหน้าวีดีโอ (วินาที)
+lesson_progress,video_duration_seconds,INTEGER,10,YES,NO,NO,ความยาววีดีโอทั้งหมด (วินาที)
+lesson_progress,video_progress_percentage,"DECIMAL(5,2)",,YES,NO,NO,เปอร์เซ็นต์ความคืบหน้าวีดีโอ
+lesson_progress,last_watched_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่ดูล่าสุด
+lesson_progress,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+lesson_progress,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+quiz_attempts,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+quiz_attempts,user_id,INTEGER,10,NO,NO,YES,อ้างอิงนักเรียน
+quiz_attempts,quiz_id,INTEGER,10,NO,NO,YES,อ้างอิงแบบทดสอบ
+quiz_attempts,score,INTEGER,10,NO,NO,NO,คะแนนที่ได้ (0-100)
+quiz_attempts,total_questions,INTEGER,10,NO,NO,NO,จำนวนคำถามทั้งหมด
+quiz_attempts,correct_answers,INTEGER,10,NO,NO,NO,จำนวนคำตอบที่ถูก
+quiz_attempts,is_passed,BOOLEAN,,NO,NO,NO,สถานะผ่าน
+quiz_attempts,attempt_number,INTEGER,10,NO,NO,NO,ครั้งที่ทำ
+quiz_attempts,answers,JSONB,,YES,NO,NO,คำตอบของนักเรียนสำหรับตรวจสอบ
+quiz_attempts,started_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่เริ่มทำ
+quiz_attempts,completed_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่ทำเสร็จ
+announcements,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+announcements,course_id,INTEGER,10,NO,NO,YES,อ้างอิงคอร์ส
+announcements,title,JSONB,,NO,NO,NO,ชื่อประกาศหลายภาษา
+announcements,content,JSONB,,NO,NO,NO,เนื้อหาประกาศหลายภาษา
+announcements,status,VARCHAR,20,NO,NO,NO,"สถานะ enum(DRAFT, PUBLISHED, ARCHIVED)"
+announcements,is_pinned,BOOLEAN,,NO,NO,NO,ปักหมุด
+announcements,published_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่กำหนดเผยแพร่
+announcements,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+announcements,created_by,INTEGER,10,NO,NO,YES,ผู้สร้าง
+announcements,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+announcements,updated_by,INTEGER,10,YES,NO,YES,ผู้แก้ไขล่าสุด
+announcement_attachments,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+announcement_attachments,announcement_id,INTEGER,10,NO,NO,YES,อ้างอิงประกาศ
+announcement_attachments,file_name,VARCHAR,255,NO,NO,NO,ชื่อไฟล์
+announcement_attachments,file_path,VARCHAR,500,NO,NO,NO,เส้นทาง/คีย์ S3
+announcement_attachments,file_size,INTEGER,10,NO,NO,NO,ขนาดไฟล์ (ไบต์)
+announcement_attachments,mime_type,VARCHAR,100,NO,NO,NO,ประเภท MIME
+announcement_attachments,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+lesson_attachments,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+lesson_attachments,lesson_id,INTEGER,10,NO,NO,YES,อ้างอิงบทเรียน
+lesson_attachments,file_name,VARCHAR,255,NO,NO,NO,ชื่อไฟล์
+lesson_attachments,file_path,VARCHAR,500,NO,NO,NO,เส้นทาง/คีย์ S3
+lesson_attachments,file_size,INTEGER,10,NO,NO,NO,ขนาดไฟล์ (ไบต์)
+lesson_attachments,mime_type,VARCHAR,100,NO,NO,NO,ประเภท MIME
+lesson_attachments,description,JSONB,,YES,NO,NO,คำอธิบายไฟล์หลายภาษา
+lesson_attachments,sort_order,INTEGER,10,NO,NO,NO,ลำดับการแสดงผล
+lesson_attachments,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+orders,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+orders,user_id,INTEGER,10,NO,NO,YES,อ้างอิงลูกค้า
+orders,total_amount,"DECIMAL(10,2)",,NO,NO,NO,ยอดรวมคำสั่งซื้อ
+orders,status,VARCHAR,20,NO,NO,NO,"สถานะ enum(PENDING, PAID, CANCELLED, REFUNDED)"
+orders,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+orders,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+order_items,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+order_items,order_id,INTEGER,10,NO,NO,YES,อ้างอิงคำสั่งซื้อ
+order_items,course_id,INTEGER,10,NO,NO,YES,อ้างอิงคอร์ส
+order_items,price,"DECIMAL(10,2)",,NO,NO,NO,ราคาคอร์ส ณ เวลาที่ซื้อ
+order_items,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+payments,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+payments,order_id,INTEGER,10,NO,NO,YES,อ้างอิงคำสั่งซื้อ
+payments,provider,VARCHAR,50,NO,NO,NO,"ผู้ให้บริการชำระเงิน enum(stripe, paypal, promptpay)"
+payments,transaction_id,VARCHAR,100,YES,NO,NO,รหัสธุรกรรมจากผู้ให้บริการ (ไม่ซ้ำ)
+payments,amount,"DECIMAL(10,2)",,NO,NO,NO,จำนวนเงินที่ชำระ
+payments,status,VARCHAR,20,NO,NO,NO,"สถานะ enum(PENDING, SUCCESS, FAILED)"
+payments,paid_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่ชำระเงิน
+payments,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+payments,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+instructor_balances,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+instructor_balances,instructor_id,INTEGER,10,NO,NO,YES,อ้างอิงผู้สอน (ไม่ซ้ำ)
+instructor_balances,available_amount,"DECIMAL(10,2)",,NO,NO,NO,ยอดเงินคงเหลือ
+instructor_balances,withdrawn_amount,"DECIMAL(10,2)",,NO,NO,NO,ยอดเงินที่ถอนแล้วทั้งหมด
+instructor_balances,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+instructor_balances,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+withdrawal_requests,id,INTEGER,10,NO,YES,NO,คีย์หลัก เพิ่มค่าอัตโนมัติ
+withdrawal_requests,instructor_id,INTEGER,10,NO,NO,YES,อ้างอิงผู้สอน
+withdrawal_requests,amount,"DECIMAL(10,2)",,NO,NO,NO,จำนวนเงินที่ขอถอน
+withdrawal_requests,status,VARCHAR,20,NO,NO,NO,"สถานะ enum(PENDING, APPROVED, REJECTED, PAID)"
+withdrawal_requests,approved_by,INTEGER,10,YES,NO,YES,ผู้ดูแลที่อนุมัติ
+withdrawal_requests,approved_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่อนุมัติ
+withdrawal_requests,rejected_reason,TEXT,,YES,NO,NO,เหตุผลที่ปฏิเสธ
+withdrawal_requests,created_at,TIMESTAMP,,NO,NO,NO,วันเวลาที่สร้าง
+withdrawal_requests,updated_at,TIMESTAMP,,YES,NO,NO,วันเวลาที่แก้ไขล่าสุด
+withdrawal_requests,updated_by,INTEGER,10,YES,NO,YES,ผู้แก้ไขล่าสุด

docs/api-docs/api_course_cloning.md

@@ -0,0 +1,360 @@
+# Course Cloning API
+
+## 📋 Overview
+
+API endpoint for cloning an entire course including all content, lessons, quizzes, and attachments.
+
+---
+
+## 🔧 Clone Course
+
+### Endpoint
+```http
+POST /api/instructor/courses/:courseId/clone
+Authorization: Bearer <instructor-token>
+Content-Type: application/json
+```
+
+### Request Body
+```json
+{
+  "new_title": {
+    "th": "Python สำหรับผู้เริ่มต้น (ปรับปรุง 2026)",
+    "en": "Python for Beginners (Updated 2026)"
+  },
+  "new_slug": "python-beginners-2026",
+  "copy_settings": {
+    "copy_chapters": true,
+    "copy_lessons": true,
+    "copy_quizzes": true,
+    "copy_attachments": true,
+    "copy_announcements": false
+  }
+}
+```
+
+### Response 201
+```json
+{
+  "new_course_id": 25,
+  "cloned_from_course_id": 1,
+  "status": "DRAFT",
+  "message": "Course cloned successfully",
+  "cloned_content": {
+    "chapters": 10,
+    "lessons": 45,
+    "quizzes": 10,
+    "questions": 150,
+    "attachments": 30,
+    "total_duration_minutes": 1200
+  },
+  "next_steps": [
+    "Edit content as needed",
+    "Update videos if necessary",
+    "Submit for approval when ready"
+  ]
+}
+```
+
+---
+
+## 📝 What Gets Cloned
+
+### ✅ Copied:
+- Course info (title, description, price, thumbnail)
+- All chapters
+- All lessons (including video references)
+- All quizzes and questions
+- All attachments (files copied to new location)
+- Course settings (is_free, have_certificate)
+- Lesson prerequisites
+- Sort orders
+
+### ❌ NOT Copied:
+- Enrollments
+- Student progress
+- Reviews/ratings
+- Announcements (optional)
+- Approval status (new course = DRAFT)
+- Statistics
+
+---
+
+## 🎯 Use Cases
+
+### 1. Update Videos
+```
+1. Clone course
+2. Replace videos in new course
+3. Submit for approval
+4. Publish
+```
+
+### 2. Add Lessons
+```
+1. Clone course
+2. Add new lessons/chapters
+3. Submit for approval
+4. Publish
+```
+
+### 3. Major Restructure
+```
+1. Clone course
+2. Reorganize chapters/lessons
+3. Update content
+4. Submit for approval
+5. Publish
+```
+
+---
+
+## 🔒 Permissions
+
+**Who can clone**:
+- ✅ Course owner (created_by)
+- ✅ Primary instructor (is_primary = true)
+- ✅ Admin
+
+**Restrictions**:
+- ❌ Cannot clone archived courses
+- ❌ Cannot clone rejected courses
+- ✅ Can clone approved/published courses
+
+---
+
+## 📊 Clone Process
+
+### Backend Process:
+```javascript
+async function cloneCourse(originalCourseId, newData) {
+  // 1. Create new course
+  const newCourse = await createCourse({
+    ...originalCourse,
+    title: newData.new_title,
+    slug: newData.new_slug,
+    status: 'DRAFT',
+    created_by: currentUser.id
+  });
+  
+  // 2. Clone chapters
+  for (const chapter of originalChapters) {
+    const newChapter = await createChapter({
+      ...chapter,
+      course_id: newCourse.id
+    });
+    
+    // 3. Clone lessons
+    for (const lesson of chapter.lessons) {
+      const newLesson = await createLesson({
+        ...lesson,
+        chapter_id: newChapter.id
+      });
+      
+      // 4. Clone attachments (copy files)
+      for (const attachment of lesson.attachments) {
+        await copyFileToS3(attachment.file_path, newPath);
+        await createAttachment({
+          ...attachment,
+          lesson_id: newLesson.id,
+          file_path: newPath
+        });
+      }
+      
+      // 5. Clone quizzes
+      if (lesson.quiz) {
+        const newQuiz = await createQuiz({
+          ...lesson.quiz,
+          lesson_id: newLesson.id
+        });
+        
+        // 6. Clone questions
+        for (const question of lesson.quiz.questions) {
+          const newQuestion = await createQuestion({
+            ...question,
+            quiz_id: newQuiz.id
+          });
+          
+          // 7. Clone choices
+          for (const choice of question.choices) {
+            await createChoice({
+              ...choice,
+              question_id: newQuestion.id
+            });
+          }
+        }
+      }
+    }
+  }
+  
+  return newCourse;
+}
+```
+
+---
+
+## ⚠️ Error Handling
+
+### Error: Course Not Found
+```json
+{
+  "error": {
+    "code": "COURSE_NOT_FOUND",
+    "message": "Course not found or you don't have permission"
+  }
+}
+```
+
+### Error: Slug Already Exists
+```json
+{
+  "error": {
+    "code": "SLUG_EXISTS",
+    "message": "Course slug already exists. Please use a different slug.",
+    "suggestion": "python-beginners-2026-v2"
+  }
+}
+```
+
+### Error: Clone Failed
+```json
+{
+  "error": {
+    "code": "CLONE_FAILED",
+    "message": "Failed to clone course. Please try again.",
+    "details": "Error copying attachment: file.pdf"
+  }
+}
+```
+
+---
+
+## 🎨 Frontend Integration
+
+### Clone Button
+```javascript
+async function cloneCourse(courseId) {
+  const response = await fetch(`/api/instructor/courses/${courseId}/clone`, {
+    method: 'POST',
+    headers: {
+      'Authorization': `Bearer ${token}`,
+      'Content-Type': 'application/json'
+    },
+    body: JSON.stringify({
+      new_title: {
+        th: `${originalTitle.th} (คัดลอก)`,
+        en: `${originalTitle.en} (Copy)`
+      },
+      new_slug: `${originalSlug}-copy-${Date.now()}`
+    })
+  });
+  
+  const data = await response.json();
+  
+  if (response.ok) {
+    // Redirect to edit new course
+    window.location.href = `/instructor/courses/${data.new_course_id}/edit`;
+  }
+}
+```
+
+---
+
+## 📈 Performance Considerations
+
+### Large Courses:
+- Use background job for cloning
+- Show progress indicator
+- Send notification when complete
+
+```http
+POST /api/instructor/courses/:courseId/clone
+{
+  "async": true
+}
+
+Response 202:
+{
+  "job_id": "clone-job-123",
+  "status": "PROCESSING",
+  "message": "Clone in progress. You will be notified when complete.",
+  "estimated_time_minutes": 5
+}
+```
+
+### Check Job Status:
+```http
+GET /api/instructor/clone-jobs/:jobId
+
+Response:
+{
+  "job_id": "clone-job-123",
+  "status": "COMPLETED",
+  "new_course_id": 25,
+  "progress": {
+    "chapters": "10/10",
+    "lessons": "45/45",
+    "quizzes": "10/10"
+  }
+}
+```
+
+---
+
+## 🔗 Related Endpoints
+
+### Get Clone History
+```http
+GET /api/instructor/courses/:courseId/clones
+```
+
+**Response**:
+```json
+{
+  "original_course_id": 1,
+  "clones": [
+    {
+      "id": 25,
+      "title": "Python for Beginners (Updated 2026)",
+      "status": "PUBLISHED",
+      "cloned_at": "2026-01-06T15:00:00Z",
+      "cloned_by": "Prof. John Smith"
+    },
+    {
+      "id": 30,
+      "title": "Python for Beginners (Advanced)",
+      "status": "DRAFT",
+      "cloned_at": "2026-01-05T10:00:00Z"
+    }
+  ]
+}
+```
+
+---
+
+## ✅ Summary
+
+**Endpoint**: `POST /instructor/courses/:courseId/clone`
+
+**Copies**:
+- ✅ All chapters, lessons, quizzes
+- ✅ All attachments (files copied)
+- ✅ All settings and configurations
+
+**Does NOT copy**:
+- ❌ Enrollments or student data
+- ❌ Reviews or ratings
+- ❌ Approval status
+
+**Result**: New DRAFT course ready for editing
+
+---
+
+## 🚀 Next Steps
+
+After cloning:
+1. Edit new course as needed
+2. Update videos if necessary
+3. Add/remove lessons
+4. Submit for approval
+5. Publish when approved

docs/api-docs/api_endpoints.md

@@ -18,8 +18,8 @@ Authorization: Bearer <token>
 ### Authentication
 | Method | Endpoint | Auth | Description |
 |--------|----------|------|-------------|
-| POST | `/auth/register` | - | Register new user |
-| POST | `/auth/login` | - | Login |
+| POST | `/auth/register` | - | Register new user (username + email) |
+| POST | `/auth/login` | - | Login (username OR email) |
 | POST | `/auth/logout` | ✅ | Logout |
 | POST | `/auth/refresh` | ✅ | Refresh token |
 | POST | `/auth/password/reset-request` | - | Request password reset |
@@ -28,8 +28,9 @@ Authorization: Bearer <token>
 ### User Profile
 | Method | Endpoint | Auth | Description |
 |--------|----------|------|-------------|
-| GET | `/users/me` | ✅ | Get current user profile |
-| PUT | `/users/me` | ✅ | Update profile |
+| GET | `/users/me` | ✅ | Get current user info |
+| GET | `/users/me/profile` | ✅ | Get user profile details |
+| PUT | `/users/me/profile` | ✅ | Update profile (name, phone, avatar) |
 | PUT | `/users/me/password` | ✅ | Change password |
 
 ### User Management (Admin)
@@ -40,6 +41,12 @@ Authorization: Bearer <token>
 | PUT | `/admin/users/:userId/role` | 🔒 Admin | Update user role |
 | DELETE | `/admin/users/:userId` | 🔒 Admin | Deactivate user |
 
+### Role Management (Admin)
+| Method | Endpoint | Auth | Description |
+|--------|----------|------|-------------|
+| GET | `/admin/roles` | 🔒 Admin | List all roles |
+| GET | `/admin/roles/:roleId` | 🔒 Admin | Get role details |
+
 ---
 
 ## 2. Categories
@@ -83,6 +90,15 @@ Authorization: Bearer <token>
 | PUT | `/instructor/courses/:courseId` | 👨‍🏫 Instructor | Update course |
 | DELETE | `/instructor/courses/:courseId` | 👨‍🏫 Instructor | Delete course |
 | POST | `/instructor/courses/:courseId/submit` | 👨‍🏫 Instructor | Submit for approval |
+| POST | `/instructor/courses/:courseId/clone` | 👨‍🏫 Instructor | Clone course (copy all content) |
+
+### Course Instructors
+| Method | Endpoint | Auth | Description |
+|--------|----------|------|-------------|
+| GET | `/instructor/courses/:courseId/instructors` | 👨‍🏫 Instructor | List course instructors |
+| POST | `/instructor/courses/:courseId/instructors` | 👨‍🏫 Instructor | Add instructor to course |
+| DELETE | `/instructor/courses/:courseId/instructors/:userId` | 👨‍🏫 Instructor | Remove instructor |
+| PUT | `/instructor/courses/:courseId/instructors/:userId/primary` | 👨‍🏫 Instructor | Set as primary instructor |
 
 ---
 
@@ -166,8 +182,8 @@ Authorization: Bearer <token>
 |--------|----------|------|-------------|
 | GET | `/students/progress` | 👨‍🎓 Student | Get my overall progress |
 | GET | `/students/courses/:courseId/progress` | 👨‍🎓 Student | Get course progress |
-| GET | `/students/courses/:courseId/certificate` | 👨‍🎓 Student | Get certificate |
-| GET | `/students/certificates` | 👨‍🎓 Student | Get all certificates |
+| GET | `/students/courses/:courseId/certificate` | 👨‍🎓 Student | Get certificate (PDF file_path) |
+| GET | `/students/certificates` | 👨‍🎓 Student | Get all my certificates |
 
 ### Instructor Reports
 | Method | Endpoint | Auth | Description |
@@ -311,15 +327,15 @@ Authorization: Bearer <token>
 
 ---
 
-## Total Endpoints: **96+**
+## Total Endpoints: **107+**
 
 - Authentication: 6
-- User Management: 4
+- User Management: 6 (+2 profile, +2 roles)
 - Categories: 5
-- Courses: 14 (+2)
+- Courses: 19 (+4 instructors, +1 clone)
 - Chapters & Lessons: 16
 - Quizzes: 10
-- Announcements: 7 (+1)
+- Announcements: 7
 - Reports: 11
 - Orders & Payments: 7 (อนาคต)
 - Earnings & Withdrawals: 8 (อนาคต)

docs/api-docs/api_v3_examples.md

@@ -0,0 +1,563 @@
+# API Usage Examples for ERD v3
+
+## 🔐 Authentication
+
+### Register with Username
+```http
+POST /api/auth/register
+Content-Type: application/json
+
+{
+  "username": "john_doe",
+  "email": "john@example.com",
+  "password": "SecurePass123!",
+  "first_name": "John",
+  "last_name": "Doe",
+  "prefix": "Mr."
+}
+```
+
+**Response 201**:
+```json
+{
+  "user": {
+    "id": 1,
+    "username": "john_doe",
+    "email": "john@example.com",
+    "role": {
+      "id": 3,
+      "code": "STUDENT",
+      "name": {
+        "th": "นักเรียน",
+        "en": "Student"
+      }
+    },
+    "profile": {
+      "prefix": "Mr.",
+      "first_name": "John",
+      "last_name": "Doe"
+    }
+  },
+  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
+}
+```
+
+---
+
+### Login with Username
+```http
+POST /api/auth/login
+Content-Type: application/json
+
+{
+  "username": "john_doe",
+  "password": "SecurePass123!"
+}
+```
+
+**Response 200**:
+```json
+{
+  "user": {
+    "id": 1,
+    "username": "john_doe",
+    "email": "john@example.com",
+    "role": {
+      "code": "STUDENT",
+      "name": {"th": "นักเรียน", "en": "Student"}
+    }
+  },
+  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
+}
+```
+
+---
+
+### Login with Email
+```http
+POST /api/auth/login
+Content-Type: application/json
+
+{
+  "email": "john@example.com",
+  "password": "SecurePass123!"
+}
+```
+
+**Response**: Same as username login
+
+---
+
+## 👤 User Profile
+
+### Get User Info
+```http
+GET /api/users/me
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "id": 1,
+  "username": "john_doe",
+  "email": "john@example.com",
+  "email_verified_at": "2026-01-01T10:00:00Z",
+  "role": {
+    "id": 3,
+    "code": "STUDENT",
+    "name": {"th": "นักเรียน", "en": "Student"}
+  },
+  "created_at": "2026-01-01T10:00:00Z"
+}
+```
+
+---
+
+### Get User Profile Details
+```http
+GET /api/users/me/profile
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "id": 1,
+  "user_id": 1,
+  "prefix": "Mr.",
+  "first_name": "John",
+  "last_name": "Doe",
+  "phone": "0812345678",
+  "avatar_url": "https://s3.../avatars/john.jpg",
+  "created_at": "2026-01-01T10:00:00Z",
+  "updated_at": "2026-01-05T15:30:00Z"
+}
+```
+
+---
+
+### Update Profile
+```http
+PUT /api/users/me/profile
+Authorization: Bearer <token>
+Content-Type: application/json
+
+{
+  "prefix": "Dr.",
+  "first_name": "John",
+  "last_name": "Doe",
+  "phone": "0898765432",
+  "avatar_url": "https://s3.../avatars/john-new.jpg"
+}
+```
+
+**Response 200**:
+```json
+{
+  "id": 1,
+  "prefix": "Dr.",
+  "first_name": "John",
+  "last_name": "Doe",
+  "phone": "0898765432",
+  "avatar_url": "https://s3.../avatars/john-new.jpg",
+  "updated_at": "2026-01-06T11:00:00Z",
+  "updated_by": 1
+}
+```
+
+---
+
+## 🎓 Multi-Instructor Support
+
+### List Course Instructors
+```http
+GET /api/instructor/courses/1/instructors
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "instructors": [
+    {
+      "id": 1,
+      "user_id": 5,
+      "username": "prof_smith",
+      "name": "Prof. John Smith",
+      "avatar_url": "https://s3.../avatars/smith.jpg",
+      "is_primary": true,
+      "joined_at": "2026-01-01T10:00:00Z"
+    },
+    {
+      "id": 2,
+      "user_id": 10,
+      "username": "dr_jane",
+      "name": "Dr. Jane Doe",
+      "avatar_url": "https://s3.../avatars/jane.jpg",
+      "is_primary": false,
+      "joined_at": "2026-01-05T14:00:00Z"
+    }
+  ]
+}
+```
+
+---
+
+### Add Instructor to Course
+```http
+POST /api/instructor/courses/1/instructors
+Authorization: Bearer <token>
+Content-Type: application/json
+
+{
+  "user_id": 15,
+  "is_primary": false
+}
+```
+
+**Response 201**:
+```json
+{
+  "id": 3,
+  "course_id": 1,
+  "user_id": 15,
+  "username": "ta_mike",
+  "name": "Mike Johnson",
+  "is_primary": false,
+  "joined_at": "2026-01-06T11:00:00Z"
+}
+```
+
+---
+
+### Set Primary Instructor
+```http
+PUT /api/instructor/courses/1/instructors/10/primary
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "message": "Primary instructor updated",
+  "instructors": [
+    {
+      "user_id": 5,
+      "is_primary": false
+    },
+    {
+      "user_id": 10,
+      "is_primary": true
+    }
+  ]
+}
+```
+
+---
+
+### Remove Instructor
+```http
+DELETE /api/instructor/courses/1/instructors/15
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "message": "Instructor removed successfully"
+}
+```
+
+**Error 400** (Last instructor):
+```json
+{
+  "error": {
+    "code": "LAST_INSTRUCTOR",
+    "message": "Cannot remove the last instructor from course"
+  }
+}
+```
+
+---
+
+## 🎓 Certificates
+
+### Get My Certificates
+```http
+GET /api/students/certificates
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "certificates": [
+    {
+      "id": 1,
+      "course_id": 1,
+      "course_title": "Python for Beginners",
+      "completion_date": "2026-01-05",
+      "file_path": "https://s3.../certificates/cert-user1-course1.pdf",
+      "issued_at": "2026-01-05T16:00:00Z"
+    },
+    {
+      "id": 2,
+      "course_id": 3,
+      "course_title": "Web Development Bootcamp",
+      "completion_date": "2025-12-20",
+      "file_path": "https://s3.../certificates/cert-user1-course3.pdf",
+      "issued_at": "2025-12-20T10:00:00Z"
+    }
+  ]
+}
+```
+
+---
+
+### Get Course Certificate
+```http
+GET /api/students/courses/1/certificate
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "id": 1,
+  "course_id": 1,
+  "course_title": "Python for Beginners",
+  "student_name": "John Doe",
+  "completion_date": "2026-01-05",
+  "file_path": "https://s3.../certificates/cert-user1-course1.pdf",
+  "issued_at": "2026-01-05T16:00:00Z"
+}
+```
+
+**Error 404** (Not completed):
+```json
+{
+  "error": {
+    "code": "CERTIFICATE_NOT_FOUND",
+    "message": "Certificate not available. Complete the course first."
+  }
+}
+```
+
+**Error 400** (Course doesn't issue certificates):
+```json
+{
+  "error": {
+    "code": "NO_CERTIFICATE",
+    "message": "This course does not issue certificates"
+  }
+}
+```
+
+---
+
+## 🔒 Role Management (Admin)
+
+### List All Roles
+```http
+GET /api/admin/roles
+Authorization: Bearer <admin-token>
+```
+
+**Response 200**:
+```json
+{
+  "roles": [
+    {
+      "id": 1,
+      "code": "ADMIN",
+      "name": {
+        "th": "ผู้ดูแลระบบ",
+        "en": "Administrator"
+      },
+      "description": {
+        "th": "มีสิทธิ์เต็มในการจัดการระบบ",
+        "en": "Full system access"
+      }
+    },
+    {
+      "id": 2,
+      "code": "INSTRUCTOR",
+      "name": {
+        "th": "ผู้สอน",
+        "en": "Instructor"
+      },
+      "description": {
+        "th": "สามารถสร้างและจัดการคอร์สเรียน",
+        "en": "Can create and manage courses"
+      }
+    },
+    {
+      "id": 3,
+      "code": "STUDENT",
+      "name": {
+        "th": "นักเรียน",
+        "en": "Student"
+      },
+      "description": {
+        "th": "สามารถลงทะเบียนและเรียนคอร์ส",
+        "en": "Can enroll and learn courses"
+      }
+    }
+  ]
+}
+```
+
+---
+
+### Get Role Details
+```http
+GET /api/admin/roles/2
+Authorization: Bearer <admin-token>
+```
+
+**Response 200**:
+```json
+{
+  "id": 2,
+  "code": "INSTRUCTOR",
+  "name": {
+    "th": "ผู้สอน",
+    "en": "Instructor"
+  },
+  "description": {
+    "th": "สามารถสร้างและจัดการคอร์สเรียน",
+    "en": "Can create and manage courses"
+  },
+  "user_count": 45,
+  "created_at": "2026-01-01T00:00:00Z"
+}
+```
+
+---
+
+## 📚 Course with Certificate
+
+### Get Course Details (with have_certificate)
+```http
+GET /api/courses/1
+```
+
+**Response 200**:
+```json
+{
+  "id": 1,
+  "title": {
+    "th": "Python สำหรับผู้เริ่มต้น",
+    "en": "Python for Beginners"
+  },
+  "description": {...},
+  "price": 990,
+  "is_free": false,
+  "have_certificate": true,
+  "instructors": [
+    {
+      "user_id": 5,
+      "name": "Prof. John Smith",
+      "is_primary": true
+    },
+    {
+      "user_id": 10,
+      "name": "Dr. Jane Doe",
+      "is_primary": false
+    }
+  ],
+  "total_lessons": 50,
+  "total_duration": 1200,
+  "status": "APPROVED"
+}
+```
+
+---
+
+## 🎯 Quiz with show_answers_after_completion
+
+### Get Quiz
+```http
+GET /api/students/quizzes/1
+Authorization: Bearer <token>
+```
+
+**Response 200**:
+```json
+{
+  "id": 1,
+  "title": {"th": "แบบทดสอบท้ายบท", "en": "Chapter Quiz"},
+  "description": {...},
+  "passing_score": 60,
+  "time_limit": 30,
+  "shuffle_questions": true,
+  "shuffle_choices": true,
+  "show_answers_after_completion": true,
+  "questions": [...]
+}
+```
+
+---
+
+### Submit Quiz (with answers shown)
+```http
+POST /api/students/quizzes/1/submit
+Authorization: Bearer <token>
+Content-Type: application/json
+
+{
+  "answers": [
+    {"question_id": 1, "choice_id": 3},
+    {"question_id": 2, "choice_id": 7}
+  ]
+}
+```
+
+**Response 200** (show_answers_after_completion = true):
+```json
+{
+  "attempt_id": 1,
+  "score": 75,
+  "total_questions": 10,
+  "correct_answers": 8,
+  "is_passed": true,
+  "answers": [
+    {
+      "question_id": 1,
+      "question": {"th": "Python คืออะไร?"},
+      "your_answer": 3,
+      "correct_answer": 3,
+      "is_correct": true,
+      "explanation": {"th": "Python เป็นภาษาโปรแกรมมิ่ง..."}
+    },
+    {
+      "question_id": 2,
+      "question": {"th": "ตัวแปรใน Python..."},
+      "your_answer": 7,
+      "correct_answer": 8,
+      "is_correct": false,
+      "explanation": {"th": "ตัวแปรใน Python ไม่ต้องประกาศชนิดข้อมูล"}
+    }
+  ]
+}
+```
+
+**Response 200** (show_answers_after_completion = false):
+```json
+{
+  "attempt_id": 1,
+  "score": 75,
+  "total_questions": 10,
+  "correct_answers": 8,
+  "is_passed": true
+}
+```
+
+---
+
+## 🔗 Related Documentation
+
+- [API Endpoints Reference](./api_endpoints.md)
+- [ERD v3 Schema](./ER/ERD_v3_improved.txt)
+- [Edge Cases](./edge_cases_quick_reference.md)