Timestamp (in millis-since-epoch) of the instant when the envelope was created. The meaning of "when the
envelope was created" is implementation specific and could be an instant on the producer machine, or the
instant when the database persisted the envelope, or other.
Timestamp (in millis-since-epoch) of the instant when the envelope was created. The meaning of "when the
envelope was created" is implementation specific and could be an instant on the producer machine, or the
instant when the database persisted the envelope, or other.