title: How to add new seed data to existing rails database
body: <p>I am working on an application that is already deployed to some test and staging systems and various developers workstations. I need to add some additional reference data but i'm not sure how to add it.</p>
  
  <p>Most of the advice says use seed.rb, however my understanding is that this is only run once, when the application is initially deployed. Since we don't want to rebuild the test and staging databases just so that we can add 1 row of reference data, is there another way to add the data?</p>
  
  <p>I'm thinking of using a db migration, is this the correct approach?</p>
  
  <p>Thanks</p>