createdAt property
CreatedAt is when the row was written, same format. Every path that opens a session stamps it and StartedAt from one clock reading, so the two are equal on every session this surface has ever produced.
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;