Interface UpdateCollectionListResponse

Set to true when this response is a cached replay returned for an idempotency_key that was already processed. Set to false (or omitted) when the request was executed fresh. Buyers use this to distinguish cached replays from new executions — matters for billing reconciliation, audit logs, and any downstream system that assumes exactly-once event semantics. Only present on responses to mutating requests that carry idempotency_key.