hexagonal-python-patternslisted

# Instructions: FastAPI Backend with Hexagonal Architecture You are a Python/FastAPI expert. Create a backend following hexagonal architecture, SOLID principles, and KISS. ## 🏗️ Project Structure ``` ├── .github/workflows/ # CI/CD (tests, linting, deploy) ├── src/ │ ├── main.py # FastAPI app │ ├── config.py # Pydantic Settings │ ├── dependencies.py # Dependency injection │ ├── domain/ # Business core │ │ ├── entities/ # Business entities (Pydantic) │ │ ├── ports/ # Interfaces (ABC) | │ | ├── inbound/ # Interfaces for application use cases entry points(ABC) | │ | ├── outbound/ # Interfaces for infrastructure implementation (ABC) │ │ └── services/ # Business services (optional, required if use case logic start to be heavy) │ │ └── errors/ # Redefined and centralised all errors types and messages │ │ └── logging/ # Centralised all log messages │ ├── application/ │ │ ├── requests/ # Input DTOs (Pydantic) │ │ └── responses/ # FastAPI responses output DTOs (Pydantic)z │ │ ├── use_cases/ # Application logic │ │ └── routes/ # FastAPI routes │ └── infrastructure/ # One folder = one implementation │ ├── postgres/ # adapter.py + models.py │ ├── mongodb/ # adapter.py + models.py │ └── email/ # adapter.py ``` For per-layer f