{
  "unit": "site-window and calendar day",
  "development": "2026-03-01/2026-03-04 inclusive",
  "test": "2026-03-05/2026-03-07 inclusive",
  "sites": [
    "shop-a",
    "shop-b"
  ],
  "leakage_controls": [
    "No random row split inside one labeled event",
    "Hour of day and client alias are not model features",
    "Train and test automation use different client aliases and hours"
  ]
}