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@@ -52,17 +52,18 @@ RUN echo "" > ./traffic_control/__init__.py || true
 RUN pip install --no-cache-dir -e .
 
 # ── Runtime config ────────────────────────────────────────────────────────
-ENV WORKERS=2
 ENV PORT=7860
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 
 EXPOSE 7860
 
-
+# Single worker is required: Gradio's mount_gradio_app is not fork-safe.
+# HF Spaces expects a single healthy process on port 7860.
 ENV ENABLE_WEB_INTERFACE=true
 CMD ["sh", "-c", \
      "uvicorn traffic_control.server.app:app \
       --host 0.0.0.0 \
       --port ${PORT} \
-      --workers ${WORKERS}"]
+      --workers 1 \
+      --timeout-keep-alive 75"]