title: How to update database connection details in symfony (maybe propel?)
body: <p>I don't develop with symphony but need to update the database connection details for a couple websites developed by third parties running it.</p>
  <p>They appear to make use of propel.</p>
  <p>I've updated the dsn in database.yml but this has just taken the site offline (500 error)</p>
  <p>Any idea what I might have done wrong or may need to do to force the changes through. Is there some kind of update script I need to run?</p>
  <p>In case it helps I seem to have propel-init-crud, propel-generate-crud as options for propel when I run:</p>
  <h1>&gt; php symfony propel</h1>