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Return only items carrying this tag (e.g. upgrade, incident, subnet). Exact match against the item's tags array.

Inclusive lower bound on item timestamps, as an ISO-8601 date (2026-06-01, a whole UTC day) or date-time with an explicit offset. Malformed values are a 400, never silently ignored. Must not be later than the range's upper bound.

Inclusive upper bound, same format as since. A bare date covers the whole named UTC day. Must not be earlier than the range's lower bound.

Maximum items to return (1-50). Defaults to 50.