Thanks Lars!
By all means I will leave automatic partition pruning to the optimizer if possible. And I totally agree that l have to rethink ETL and model design completely without assuming techniques that were valid in other specific scenarios. This is exactly what I currently evaluate in my current PoC. So we're getting a little bit offtopic now and I thank you for the provided links and information to my question!
Best regards (topic is closed from my side),
Bodo