title: Roll back all rails migrations or drop tables and modify migrations (start from scratch)
body: <p>I'm new to Rails and have started a project that I'm unhappy with my models and db schema.</p>
  
  <p>I'd like to start again from scratch but keep all my views, controllers.</p>
  
  <p>What's the best way to go about doing this?</p>
  
  <p>I want to remove all my migrations and all my models. There should be no irrelevant files left after this process (like migrations that are no longer in use).</p>
  
  <p>If it helps, I'm using Rails 3.1</p>
  
  <p>Thanks!</p>