createdAt property
CreatedAt is when the machine was first registered, RFC 3339 in UTC. A re-link refreshes the row and leaves this alone, so it dates the machine and not the connection.
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? createdAt;