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kotlinlang

Suppose I have a model for data classes which I'm planning to persist using JPA. In Java I'm used to creating a BaseEntity with id, isNew, created, updated etc. and having the rest of the model extend it.
In Kotlin I instinctively  try to do the same and model being data classes by nature I also instinctively put `data` modifier on the classes.
But no such luck, although data classes can extend other classes, unfortunately they cannot have non val/var constructor parameters, so I cannot extend my BaseEntity.
And this restriction screws up my code all over the place, I just can't use data classes in places where they actually make sense.
What is the point of data classes if you cannot create meaningful hierarchies using them?