version property
Version is which version this is, from 1 and monotone within the dataset. A number is never reused — not even after a disposal, where the next declare continues the count — so "signups v3" means one thing forever, which is what makes a model's citation of it checkable.
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
int? version;