title: update_post_meta does not work
body: <p>this is the code I have in a template file for testing.
  when I open the page nothing happens in phpmyadmin
  I do have a meta with this key cf_address
  I do have a post with the id 436.</p>
  
  <pre><code>update_post_meta( 436, 'cf_address', 'kharia');
  </code></pre>
  
  <p>what seems to be the problem ?</p>