How do I map common columns to every class?

Question

I have a set of fields (timestamps, user info, etc) that are common to just about every table in my database. Is there a way to associate these columns without having to tediously add them to every single entity class?

My first thought was to have a common base class holding these fields with the column mappings but without the InheritanceMappingAttribute, but Linq was still looking for an inheritance chain decleration.