Fix: Compatible langchain versions + better startup script

Dockerfile

@@ -25,12 +25,9 @@ RUN mkdir -p /app/workspace_data /app/chroma_db
 # Expose ports
 EXPOSE 8000 8501
 
-# Create startup script to run both services
-RUN echo '#!/bin/bash\n\
-uvicorn app.api:app --host 0.0.0.0 --port 8000 &\n\
-sleep 5\n\
-streamlit run streamlit_app.py --server.port=8501 --server.address=0.0.0.0 --server.headless=true\n\
-' > /app/start.sh && chmod +x /app/start.sh
+# Copy startup script
+COPY startup.sh /app/startup.sh
+RUN chmod +x /app/startup.sh
 
 # Run both services
-CMD ["/bin/bash", "/app/start.sh"]
+CMD ["/bin/bash", "/app/startup.sh"]

requirements.txt

@@ -1,15 +1,15 @@
 # =============================================
-# LIGHTWEIGHT REQUIREMENTS FOR AZURE APP SERVICE
+# LIGHTWEIGHT REQUIREMENTS FOR AZURE APP SERVICE  
 # =============================================
 
-# Core LangChain (minimal)
-langchain==0.1.20
-langchain-core==0.1.52
-langchain-community==0.0.38
-langgraph==0.0.55
+# Core LangChain (compatible versions)
+langchain==0.2.14
+langchain-core==0.2.32
+langchain-community==0.2.12
+langgraph==0.2.0
 
 # Groq LLM
-langchain-groq==0.1.3
+langchain-groq==0.1.9
 
 # Web API
 fastapi==0.110.0

startup.sh

@@ -1,7 +1,22 @@
 #!/bin/bash
+set -e
 
-# Start FastAPI backend on port 8000 in background
+echo "Starting FastAPI backend on port 8000..."
 uvicorn app.api:app --host 0.0.0.0 --port 8000 &
+BACKEND_PID=$!
 
-# Start Streamlit frontend on port 8501 (Azure will use this)
+# Wait for backend to be ready
+echo "Waiting for backend to start..."
+sleep 10
+
+# Check if backend is running
+if ! kill -0 $BACKEND_PID 2>/dev/null; then
+    echo "ERROR: Backend failed to start"
+    exit 1
+fi
+
+echo "Backend started successfully (PID: $BACKEND_PID)"
+echo "Starting Streamlit frontend on port 8501..."
+
+# Start Streamlit frontend (this will keep the container running)
 streamlit run streamlit_app.py --server.port 8501 --server.address 0.0.0.0 --server.headless true