oldest property
Oldest is the WRITE time of the oldest assertion this tenant still holds after the sweep, RFC 3339, and it is omitted exactly when nothing remains at all. Still older than Before means records survived on purpose and says which mechanism kept them: a litigation hold (Held), or the per-call bound with more to sweep on the next call (Remaining).
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? oldest;