title: How to increase ActiveRecord thread pool size on heroku
body: <p>Normally I would set the pool size as</p>
  
  <pre><code>development:
    adapter: postgresql
    encoding: unicode
    database: openkitchen_development
    username: rails
    host: localhost
    pool: 10
    password:
  </code></pre>
  
  <p>in database.yml. However heroku replaces the config file. I'm using girl_friday to
  do background db work and need to increase the thread pool size.</p>