title: Where are the postgreSQL files after a db:migrate in Rails?
body: <p>When working with SQLite3, after I run <code>bundle exec rake db:migrate</code>, it updates the <code>development.sqlite3</code> file in the <code>db</code> folder (itself in my app folder).</p>
  
  <p>I configured my Rails app to work with PostgreSQL, the databases and migrations work fine but I don't know where the associated files are created. Instead, I still see the same .sqlite3 files. </p>
  
  <p>Any idea where they are lodged, or maybe they're not even created? And why the .sqlite3 are still created if I run Rails with PostgreSQL?</p>
  
  <p>Thanks a lot.</p>