Felix Feisst, I would assume that if the joined subclass hierarchy, we would expect an end revision timestamp in all 4 tables.

             Employee
              /    \
FullTimeEmployee  Contractor
       |
   Executive

Additionally, if an FullTimeEmployee is changed to set the end revision timestamp, this would be set in FullTimeEmployee and Employee. If the originating entity was an Executive, the end revision timestamp would be propagated upwards into both FullTimeEmployee as well as Employee, correct?