{
  "fixture": "synthetic",
  "source": "ad-platform-export",
  "as_of": "2026-09-02T09:00:00Z",
  "rows": [
    {"campaign_id": "C-101", "campaign": "Solar Quest", "spend_eur": 18400},
    {"campaign_id": "C-102", "campaign": "Pocket Arena", "spend_eur": 24500},
    {"campaign_id": "C-103", "campaign": "Puzzle Harbor", "spend_eur": 12800}
  ]
}