backend/Dockerfile

FROM python:3.11-slim

WORKDIR /app

# System deps
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc libpq-dev curl && \
    rm -rf /var/lib/apt/lists/*

# Python deps
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy app
COPY . .

# Health check
HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

EXPOSE 8000

CMD ["python", "-u", "main.py"]