what is "dev servers list" it's the first time I hear it :)

in _config.php

Director::set_dev_servers(array(
	'localhost',
	'127.0.0.1',
	'yourserver.com'
));

listing is very long, please give me your IP and I add yours to give you the access. site is here http://87.207.57.202/boston/

here you can see code

class Page extends SiteTree {

	public static $db = array(
		'ShowInTopMenu' => 'Boolean',
		'ShowInLeftMenu' => 'Boolean',
		'ShowInLeftMenu2' => 'Boolean',
		'visits' => 'Int'
	);

	public static $has_one = array(
	);
	
	function getCMSFields() 
	{
		$fields = parent::getCMSFields();
		
		$fields->addFieldToTab("Root.Behaviour", new CheckboxField("ShowInTopMenu", "Pokaż w menu górnym"));
		$fields->addFieldToTab("Root.Behaviour", new CheckboxField("ShowInLeftMenu", "Pokaż w menu lewym"));
		$fields->addFieldToTab("Root.Behaviour", new CheckboxField("ShowInLeftMenu2", "Pokaż w menu lewym 2"));
		
		return $fields;
	}

}

class Page_Controller extends ContentController 
{
	function topMenu()
	{
    		$whereStatement = "ShowInTopMenu = 1";
   		return DataObject::get("Page", $whereStatement);
	}
	
	function leftMenu()
	{
    		$whereStatement = "ShowInLeftMenu = 1";
    		return DataObject::get("Page", $whereStatement);
	}
	
	function leftMenu2()
	{
    		$whereStatement = "ShowInLeftMenu2 = 1";
    		return DataObject::get("Page", $whereStatement);
	}
	
	function totalVisits() 
	{
		return DB::query("SELECT SUM(visits) FROM page_live")->value();
	}
	
	public static $allowed_actions = array(
	);

	public function init() 
	{
		parent::init();

		Requirements::themedCSS('layout'); 
		Requirements::themedCSS('typography'); 
		Requirements::themedCSS('form'); 
		
		//if( ?? cookie or session variable doesn't exist ?? ) 
		//{
			//?? create session or cookie ??

			$this->visits++;
			$this->write();

		//} 
	}
}

so the important is $this->visits++; in Page Controller and 'visits' => 'Int' in public static $db

there is no update query on visits in any page* table