{
  "exercise_version": "1.0",
  "origin": "fictional, authored by Комета; no customer data",
  "time_unit": "seconds from a fictional zero",
  "stock_meaning": "physical on-hand, not net of reservations",
  "sku": "SKU-DEMO",
  "freshness_budget_s": 60,
  "rule": "visible - occurred; budget is an exercise choice, not an industry norm",
  "dedup": "event id, then monotonic version per (stock|order, key)",
  "cancel_rule": "cancellation v2 leaves tombstone even when create v1 has not arrived",
  "replay": "in-memory state must persist for replay demo; production requires durable atomic writes",
  "stale_action": "flag budget breach; real storefront fallback must be designed separately",
  "batch_eligible": "daily report whose decision deadline is after the daily extraction and reconciliation"
}