Dockerfile

# Multi-stage production container for FinTech Transaction Intelligence API
FROM python:3.11-slim as runtime

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1 \
    PYTHONPATH=/app/src

# Set working directory
WORKDIR /app

# Install system dependencies (build-essential, libgomp for OpenMP/LightGBM)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    libgomp1 \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copy dependency requirements
COPY pyproject.toml /app/

# Install python packages
RUN pip install --no-cache-dir \
    fastapi \
    uvicorn[standard] \
    gunicorn \
    pydantic \
    polars \
    numpy \
    lightgbm \
    xgboost \
    catboost \
    onnxruntime \
    onnxmltools \
    scikit-learn \
    pyyaml

# Copy application source code and configuration
COPY src /app/src
COPY configs /app/configs
COPY artifacts /app/artifacts
COPY main.py /app/

# Expose port 8000
EXPOSE 8000

# Health check endpoint
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Start Gunicorn master with Uvicorn ASGI workers
CMD ["gunicorn", "-c", "configs/gunicorn_conf.py", "api.main:app"]