[
  {
    "sku": "RET-1",
    "sold_units": "100",
    "returned_units": "12",
    "cohort": "2026-09-closed",
    "return_rate_pct": 12.0,
    "return_status": "high_returns"
  },
  {
    "sku": "RET-2",
    "sold_units": "200",
    "returned_units": "4",
    "cohort": "2026-09-closed",
    "return_rate_pct": 2.0,
    "return_status": "ok"
  },
  {
    "sku": "RET-3",
    "sold_units": "0",
    "returned_units": "0",
    "cohort": "2026-09-closed",
    "return_rate_pct": "",
    "return_status": "no_sales"
  },
  {
    "sku": "RET-4",
    "sold_units": "10",
    "returned_units": "12",
    "cohort": "2026-09-closed",
    "return_rate_pct": "",
    "return_status": "invalid_cohort"
  }
]