title: Heroku "psql: FATAL: remaining connection slots are reserved for non-replication superuser connections"
body: <p>I'm developing an app on Heroku with a Postgresql backend. Periodically, I get this error message when trying to access the database, both from the CLI and from loading a page on the server:</p>
  
  <pre><code>psql: FATAL: remaining connection slots are reserved for non-replication superuser connections
  </code></pre>
  
  <p>Anyone seen this before or please help point me in the right direction?</p>