title: Set default limit for pg_trgm
body: <p>This seems like a really basic question, but how do I change the default limit for the pg_trgm extension? Which is currently 0.3. I have done:</p>
  
  <pre><code>select set_limit(0.5)
  select show_limit() =&gt; 0.5
  </code></pre>
  
  <p>Close the connection, reconnect:</p>
  
  <pre><code>select show_limit() =&gt; 0.3
  </code></pre>
  
  <p>Thanks for your help.</p>