{
  "demo_id": "demo_20260404_083520",
  "scenario_id": "glucose",
  "dataset_id": "glu-sec01-core",
  "dataset_title": "glu-sec01-core",
  "rows": [],
  "feature_keys": [
    "glucose",
    "insulin",
    "meal_load"
  ],
  "target_key": "target_glucose",
  "summary": {
    "row_count": 0,
    "source": "none"
  }
}