title: How to update a Postgres schema with flask-sqlalchemy?
body: <p>I'm running a simple Flask app with Heroku, and I can run the following command to create all the tables:</p>
  
  <pre><code>db.create_all()
  </code></pre>
  
  <p>However, I ship new stuff frequently and I often need to add new columns to existing tables. Is there an easy way to do this?</p>
  
  <p>If I need to manually create a new column with Postgres, how would I access the repl for Heroku's Postgres database?</p>