Vergleich install/resources/upgrade13.php - 1.4.2 - 1.4.4

	$db->write_query("ALTER TABLE ".TABLE_PREFIX."adminsessions ADD INDEX ( `uid` )");
	$db->write_query("ALTER TABLE ".TABLE_PREFIX."adminsessions ADD INDEX ( `dateline` )");

	if($db->type == "mysql" || $db->type == "mysqli")
	{
		$db->write_query("ALTER TABLE ".TABLE_PREFIX."adminsessions ADD INDEX ( `uid` )");
		$db->write_query("ALTER TABLE ".TABLE_PREFIX."adminsessions ADD INDEX ( `dateline` )");
	}

	$query = $db->query("SHOW INDEX FROM ".TABLE_PREFIX."users");
	while($ukey = $db->fetch_array($query))

	if($db->type != "sqlite2" && $db->type != "sqlite3")

		if($ukey['Key_name'] == "username")

		$query = $db->query("SHOW INDEX FROM ".TABLE_PREFIX."users");
		while($ukey = $db->fetch_array($query))

			$index = $ukey;
			break;

			if($ukey['Key_name'] == "username")
			{
				$index = $ukey;
				break;
			}
		}
		if($index)
		{
			$db->write_query("ALTER TABLE ".TABLE_PREFIX."users DROP KEY username");
		}
		
		$query = $db->simple_select("users", "username, uid", "1=1 GROUP BY username HAVING count(*) > 1");
		while($user = $db->fetch_array($query))
		{
			$db->update_query("users", array('username' => $user['username']."_dup".$user['uid']), "uid='{$user['uid']}'", 1);
		}
		
		if($db->type == "pgsql")
		{
			$db->write_query("ALTER TABLE ".TABLE_PREFIX."users ADD UNIQUE(username)");
		}
		else
		{
			$db->write_query("ALTER TABLE ".TABLE_PREFIX."users ADD UNIQUE KEY username (username)");