It works now

Dockerfile

@@ -28,15 +28,17 @@ RUN apt-get purge -y build-essential python3-dev && \
 # Copy application code
 COPY app/ ./app/
 
-# Create directory for RRD data
-RUN mkdir -p /app/data
+# Create directory for RRD data at /data (will be volume mounted)
+RUN mkdir -p /data
 
 # Expose port
 EXPOSE 8000
 
 # Create non-root user for security
 RUN useradd --create-home --shell /bin/bash appuser && \
-    chown -R appuser:appuser /app
+    chown -R appuser:appuser /app && \
+    chown -R appuser:appuser /data && \
+    chmod 777 /data
 USER appuser
 
 # Health check
@@ -44,4 +46,5 @@ HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
     CMD wget --no-verbose --tries=1 --spider http://localhost:8000/health || exit 1
 
 # Run the application
-CMD ["python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
+