Index: branches/RC/admin/install/upgrades/inportal_upgrade_v4.3.1.php
===================================================================
diff -u -r10666 -r10785
--- branches/RC/admin/install/upgrades/inportal_upgrade_v4.3.1.php	(.../inportal_upgrade_v4.3.1.php)	(revision 10666)
+++ branches/RC/admin/install/upgrades/inportal_upgrade_v4.3.1.php	(.../inportal_upgrade_v4.3.1.php)	(revision 10785)
@@ -15,4 +15,11 @@
 		if ($application->Conn->GetOne($sql) === false) {
 			$application->Conn->Query($config_sql);
 		}
-	}
\ No newline at end of file
+	}
+
+	require_once FULL_PATH . '/core/install/upgrades.php'; // k4_include_once doesn't globalize $upgrade_class :(
+
+	$upgrade = new $upgrade_class();
+	/* @var $upgrade CoreUpgrades */
+
+	$upgrade->Upgrade_4_3_1('after');
\ No newline at end of file
Index: branches/RC/core/install/upgrades.php
===================================================================
diff -u -r9986 -r10785
--- branches/RC/core/install/upgrades.php	(.../upgrades.php)	(revision 9986)
+++ branches/RC/core/install/upgrades.php	(.../upgrades.php)	(revision 10785)
@@ -164,9 +164,9 @@
 		 */
 		function Upgrade_4_2_1($mode)
 		{
-			
+
 		}
-		
+
 		function Upgrade_4_2_2($mode)
 		{
 			if ($mode == 'before') {
@@ -175,6 +175,30 @@
 			}
 		}
 
+		/**
+		 * Adds index to "dob" field in "PortalUser" table when it's missing
+		 *
+		 * @param string $mode when called mode {before, after)
+		 */
+		function Upgrade_4_3_1($mode)
+		{
+			if ($mode == 'after') {
+				$sql = 'DESCRIBE ' . TABLE_PREFIX . 'PortalUser';
+				$structure = $this->Conn->Query($sql);
+
+				foreach ($structure as $field_info) {
+					if ($field_info['Field'] == 'dob') {
+						if (!$field_info['Key']) {
+							$sql = 'ALTER TABLE ' . TABLE_PREFIX . 'PortalUser
+									ADD INDEX (dob)';
+							$this->Conn->Query($sql);
+						}
+						break;
+					}
+				}
+			}
+		}
+
 	}
 
 ?>
\ No newline at end of file