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feat: production FastAPI backend — modular microservice architecture
EymenStructure: backend/ ├── main.py # ASGI app, lifespan, middleware, exception handlers ├── api/ │ ├── dependencies.py # DI providers + Annotated aliases │ ├── routers/ │ │ ├── finance.py # GET /finance/info|history|signals │ │ ├── chat.py # POST /chat/stream (SSE) + /chat/complete │ │ └── rag.py # POST /rag/upload (202) + GET /rag/jobs/{id} │ ├── schemas/ │ │ ├── requests.py # Pydantic v2 request models w/ Field constraints │ │ └── responses.py # Pydantic v2 response models (from_attributes=True) │ └── services/ │ ├── finance_service.py # asyncio.to_thread wrappers for yfinance/ta │ └── rag_service.py # EmbedJob dataclass + background task runner ├── requirements.txt └── Dockerfile # Multi-stage, non-root user, healthcheck Key architectural decisions: - Lifespan context manager:…bbb3578