title: How to do huge data migrations on Heroku?
body: <p>Hi we have an app on Heroku, that is changing a lot from time to time. This means that we need to do some pretty big migrations on our data now and then. My question is - how to do this efficiently and without having to keep a terminal connection open for several hours doing a <code>heroku run rake db:migrate</code> and with as little downtime as possible.</p>
  
  <p>And just to make myself clear - my question is NOT about writing the migrations themselves - it's only about running them on Heroku.</p>