The event is independent, it is based on the state of the aggregate at the time the event occurred. It's better to have a vector clock for the aggregate as part

The event is independent, it is based on the state of the aggregate at the time the event occurred. It's better to have a vector clock for the aggregate as part of the event to determine what was the state when the event occurred. Even if you "have a policy" people will ignore it. Better to make it explicit.