title: Best general tool to manage database deltas
body: <p>We keep our mysql schema files in source control. 
  We keep current <strong>base</strong> and <strong>delta</strong> files, and whenever a new version is released, we take a delta files, merge them into base, clear them, and create appropriate migration scripts for production data.</p>
  
  <p>We have a good enough set of scripts to do this. My question is - is there a 3rd party I can utilize to support this process, instead of our home grown scripts?</p>
  
  <p><strong>Note</strong> - I'm looking for a tool that doesn't require me to change my entire development process. The tool should not care if I'm developing a Ruby/Java/.Net application.</p>