RDF on the not-so-cheap? Real-time profiling of the internal Factory code by keeping track of every attribute and running a bunch of exciting INSERT hooks?<p>I have seen this pattern before, it comes when somebody is sick of having to adjust their database schema every time somebody comes up with a new user attribute that they <i>absolutely</i> <i>definitely</i> need to keep audited. Now you can add whatever &quot;columns&quot; you like, boss!