{
  "source": "demo",
  "keyword": "ai seo course",
  "checked_every_hours": 3,
  "note": "Replace with the Rainmaker Games leaderboard feed. Contract: horses[{id,label,host: own|free|paid|field}], snapshots[{t: ISO UTC, ranks: {id: rank or null}}]. While source is demo, derby.js generates a scripted race.",
  "horses": [],
  "snapshots": []
}