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+
+FROM python:3.9-slim
+
+# Set working directory
+WORKDIR /app
+
+# Copy all backend files
+COPY . .
+
+# Install dependencies
+RUN pip install --no-cache-dir --upgrade -r requirements.txt
+
+# Run with gunicorn (Flask app inside app.py, object name = sales_forecast_api)
+CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860", "app:sales_forecast_api"]