Slim Docker: drop torch/chronos/streamlit (~2GB), 5x faster build

Dockerfile

@@ -3,9 +3,10 @@ FROM python:3.12-slim
 WORKDIR /app
 
 # Install dependencies first (layer caching)
-COPY requirements.txt .
+# Use slim requirements (no torch/chronos/streamlit — not needed at API runtime)
+COPY backend/requirements-docker.txt backend/
 COPY backend/requirements.txt backend/
-RUN pip install --no-cache-dir -r requirements.txt -r backend/requirements.txt
+RUN pip install --no-cache-dir -r backend/requirements-docker.txt -r backend/requirements.txt
 
 # Non-root user for security
 RUN groupadd -r solarwine && useradd -r -g solarwine solarwine

backend/Dockerfile

@@ -3,9 +3,10 @@ FROM python:3.12-slim
 WORKDIR /app
 
 # Install dependencies first (layer caching)
-COPY requirements.txt .
+# Use slim requirements (no torch/chronos/streamlit — not needed at API runtime)
+COPY backend/requirements-docker.txt backend/
 COPY backend/requirements.txt backend/
-RUN pip install --no-cache-dir -r requirements.txt -r backend/requirements.txt
+RUN pip install --no-cache-dir -r backend/requirements-docker.txt -r backend/requirements.txt
 
 # Non-root user for security
 RUN groupadd -r solarwine && useradd -r -g solarwine solarwine

backend/requirements-docker.txt

@@ -0,0 +1,12 @@
+# Slim requirements for Docker backend (no torch/chronos/streamlit)
+# These are the packages actually needed at runtime by the FastAPI API.
+
+pandas>=2.0
+numpy>=1.24
+scikit-learn>=1.3
+requests>=2.28
+python-dotenv>=1.0
+xgboost>=2.0
+pvlib>=0.10.0
+astral>=3.2
+google-genai>=1.0