title: "Cannot ingress to a shared database" when trying to connect to Heroku shared PostgreSQL database
body: <p>I'm trying to connect to my newly created Heroku Django app with psql:</p>
  
  <pre><code>$ heroku pg:psql                           
  !    Cannot ingress to a shared database
  </code></pre>
  
  <p>Any ideas of what that is?</p>
  
  <p>I have a shared Postgres database 20GB plan.</p>