Database SCM

Why is it that every SCM article and every tool written is great for managing code but forgets how to manage DB assets. I have all my code in a repository, be it Subversion, CVS, or Perforce and I can automate my app deploys with CruiseControl or Anthill but what about my DB Objects and data. The systems I build are usually much more than simple java and config files and having half an automated process is almost no process at all. Install tools are the same, great at updating my app server deployment but almost all the stuff to run my DB upgrade scripts has to be written by hand. Now I am not dumb enough to do all this by hand so I used Red Gates libraries to automate a DB build, and though the tool works great, I hate having a disconnected process. I want one harness that will get me all the way there, with all the assets in the same repository. This world always seems to leave toolsets just a couple steps short. Power and promise but not true fulfillment.