title: Proper permission code for database file and database directory
body: <p>So I created a login python app, app will add data to database file while user sign-up, and app will extract data from database while user login, on production server.</p>
  
  <p>specifically, I want website users to </p>
  
  <blockquote>
    <ol>
    <li>not able to see the database file and its directory</li>
    <li>not able to download the database file if it can find the url.</li>
    <li>able to add/extract content to/from it through web app (written in python flask)</li>
    </ol>
  </blockquote>
  
  <p><strong>Thus, what permission code (such as 755,660) should I give to the database file and the directory where the database file is located?</strong> </p>