project-root/
├── domain/
│ ├── entities/
│ │ └── user.py # Core User entity (business logic)
│ ├── value_objects/
│ │ └── email.py # Value object for email validation
│ └── exceptions/
│ └── user_exceptions.py # Custom exceptions for User domain
├── application/
│ ├── use_cases/
│ │ ├── create_user.py # Use case for creating a User
│ │ ├── get_user.py # Use case for fetching a User
│ │ └── update_user.py # Use case for updating a User
│ ├── dto/
│ │ └── user_dto.py # Data Transfer Object for User
│ ├── interfaces/
│ │ └── user_repository.py # Repository interface for User
│ └── services/
│ └── user_service.py # Application Service for high-level logic
├── infrastructure/
│ ├── repositories/
│ │ └── postgres_user_repository.py # Implementation of UserRepository for PostgreSQL
│ ├── migrations/
│ │ └── create_user_table.sql # Database migration script for User table
│ └── config/
│ └── db_connection.py # Database connection logic
├── presentation/
│ ├── api/
│ │ ├── user_routes.py # API routes for User (e.g., FastAPI or Flask endpoints)
│ │ └── user_schemas.py # Request/response schemas for User (e.g., Pydantic models)
│ └── graphql/
│ └── user_resolvers.py # GraphQL resolvers for User
├── tests/
│ ├── unit/
│ │ ├── test_user_entity.py # Unit tests for User entity
│ │ ├── test_user_service.py # Unit tests for User service
│ │ └── test_user_repository.py # Unit tests for repository interface
│ ├── integration/
│ │ └── test_user_endpoints.py # Integration tests for User API endpoints
│ └── e2e/
│ └── test_user_flows.py # End-to-end tests for User workflows
├── .github/
│ └── workflows/
│ └── ci.yml # GitHub Actions CI workflow
├── Dockerfile # Dockerfile for building the app
├── docker-compose.yml # Docker Compose file for local development
├── requirements.txt # Python dependencies (or pom.xml for Java)
└── README.md # Project documentation