{
  "label": "Synthetic example: arithmetic independently checked with Python, not a live dot end-to-end product test",
  "input_rows": 8,
  "duplicate_rows_removed": ["B003"],
  "cancelled_orders_excluded": ["B004"],
  "summary": {
    "2026-09-21": {"orders": 3, "gross": 4000, "refund": 200, "net": 3800, "refund_share": 0.05, "ad_spend": 1200, "net_to_ad": 3.1666666666666665},
    "2026-09-28": {"orders": 3, "gross": 4500, "refund": 900, "net": 3600, "refund_share": 0.2, "ad_spend": 1300, "net_to_ad": 2.769230769230769}
  },
  "changes": {"gross_pct": 0.125, "net_pct": -0.052631578947368474, "refund_share_percentage_points": 15.000000000000002}
}