{
  "chapter": 1,
  "categories": [
    "transactional-fact",
    "coordination-state",
    "event-history",
    "analytical-data"
  ],
  "cases": [
    {"id": "order-status", "label": "订单当前状态", "expected": "transactional-fact"},
    {"id": "route-hint", "label": "履约服务路由提示", "expected": "coordination-state"},
    {"id": "shard-owner", "label": "分片 owner 与租约到期时间", "expected": "coordination-state"},
    {"id": "request-counter", "label": "各节点请求计数", "expected": "coordination-state"},
    {"id": "order-paid-events", "label": "OrderPaid 事件历史", "expected": "event-history"},
    {"id": "payment-ledger", "label": "支付账务分录", "expected": "transactional-fact"},
    {"id": "latency-histogram", "label": "调用延迟直方图", "expected": "analytical-data"},
    {"id": "feature-flag", "label": "临时功能开关", "expected": "coordination-state", "condition": "有外部事实源，并接受明确的陈旧窗口与回滚策略"}
  ]
}