<p>In <a href="https://github.com/OpenSIPS/opensips/pull/715#discussion_r53200554">async.h</a>:</p>
<pre style='color:#555'>&gt; @@ -36,7 +36,8 @@
&gt;   * NOTE: all values in this enum must be negative
&gt;   */
&gt;  enum async_ret_code {
&gt; -        ASYNC_NO_IO = -5,
&gt; +        ASYNC_NO_IO = -6,
&gt; +        ASYNC_CHANGE_FD,
</pre>
<p>I'd suggest moving <code>ASYNC_CHANGE_FD</code> two spots below, since it's still an async operation (but on a new DB backend/host), along with <code>ASYNC_CONTINUE</code>.</p>

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