title: Rails migration not doing anything?
body: <p>I created the following migration:</p>
  
  <pre><code>class AddTokenToRegionTriggers &lt; ActiveRecord::Migration[5.0]
    def change
      add_column :region_triggers, :token, :string
      add_index :region_triggers, :token, unique: true
    end
  end
  </code></pre>
  
  <p>There's a table called <code>region_triggers</code>. I tried running <code>rake db:migrate:up VERSION=123</code>, but it didn't do anything. The output is:</p>
  
  <pre><code>Enabling Bootsnap
  Model files unchanged.
  </code></pre>
  
  <p>When I ran <code>rake db:migrate:redo VERSION=123</code>, it said <code>No indexes found on region_triggers with the options provided.</code>.</p>
  
  <p>How do I make rails add the column and the index?</p>