{
  "nodes": [
    {"id": "event_in", "label": "Incoming Event", "type": "event", "metadata": {}},
    {"id": "preprocess", "label": "Preprocess", "type": "function", "metadata": {}},
    {
      "id": "sub_pipeline",
      "label": "Subflow: Workspace Pipeline",
      "type": "subflow",
      "metadata": {"subflow_id": "workspace_pipeline"}
    },
    {"id": "out", "label": "Emit Output", "type": "output", "metadata": {}}
  ],
  "edges": [
    {"source": "event_in", "target": "preprocess", "label": "", "metadata": {}},
    {"source": "preprocess", "target": "sub_pipeline", "label": "", "metadata": {}},
    {"source": "sub_pipeline", "target": "out", "label": "", "metadata": {}}
  ]
}