ER Diagram

Our database schema uses MongoDB with collections representing core entities. Below is a high-level Entity-Relationship overview:

// User
│
├── has many → Transactions
├── has many → Certificates
├── enrolls in many → Courses
│
Course
│
├── has many → Lessons
├── has many → Reviews
├── has many → Certificates
│
Lesson
│
├── has many → Content (Video, PDF)
│
Transaction
│
├── belongs to → User
├── belongs to → Course
│
Certificate
│
├── belongs to → User
├── belongs to → Course
│
Review
│
├── belongs to → User
├── belongs to → Course
│
Content
│
├── belongs to → Lesson