title: SlashDB error: 'ResultProxy' object has no attribute 'execution_options'
body: <p>I have a SlashDB installation on top of MySQL. Once in a while, especially after a period of time of inactivity, the first call to an API returns:</p>
  
  <pre><code>'ResultProxy' object has no attribute 'execution_options'
  </code></pre>
  
  <p>The second request (same endpoint) would work normally.</p>
  
  <p>My guess was that SlashDB's connection to MySQL had been terminated due to inactivity. I set the <code>wait_timeout</code> system variable (MySQL) to about 10 hours and it seems to help in some cases.</p>
  
  <p>What does this error mean, and is there a way to prevent it?</p>