CPostgresConnections"><span class="Identifier">rollback</span></a><span class="Other">(</span><span class="Identifier">self</span><span class="Other">:</span> <a href="postgres_types.html#PostgresConnections"><span class="Identifier">PostgresConnections</span></a><span class="Other">)</span><span class="Other">:</span> <span class="Identifier">owned</span><span class="Other">(</span><span class="Identifier">Future</span><span class="Other">[</span><span class="Identifier">void</span><span class="Other">]</s