There is something called a ChainedPersistenceHandlerBase that you can inherit from and intercept everything that goes to and from the database.

You can use override as you see fit:

Maybe you have a common base class for all classes in your model, and maybe this class implements an Interface ITrackUpdate, then it would be a good thing to catch all updates and set the datetime…

We need to install our ChainedPersistenceHandlerBase baseclass. We do this by mixing it in before the current persistencehandler , we do this in the ecospace – before we go active: