diff --git a/classes/bfw/database/Database.php b/classes/bfw/database/Database.php
--- a/classes/bfw/database/Database.php
+++ b/classes/bfw/database/Database.php
@@ -12,16 +12,15 @@
 use PDOException;
 
 class Database implements DBInterface {
-    private static $logger = null;
     private static $handle = null;
-
+    private $logger;
     /**
      * @var PDO
      */
     private $pdo;
 
     private function __construct() {
-        self::$logger = Logger::getLogger('__CLASS__');
+        $this->logger = Logger::getLogger(__CLASS__);
 
         $dsn = 'mysql:host=localhost;dbname=ticketsystem';
         $config = array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8");
@@ -59,12 +58,11 @@
      */
     public function cleanup() {
         try {
-            $status = $this->pdo->exec("DELETE FROM `t_ticket` WHERE `id` > 1;");
-            $status = $this->pdo->exec("DELETE FROM `t_history` WHERE `id` > 1;");
-            $status = $this->pdo->exec("DELETE FROM `t_user` WHERE `id` > 2;");
-            $status = $this->pdo->exec("ALTER TABLE `t_history` AUTO_INCREMENT = 1;");
-            $status = $this->pdo->exec("ALTER TABLE `t_ticket` AUTO_INCREMENT = 1;");
-            $status = $this->pdo->exec("ALTER TABLE `t_user` AUTO_INCREMENT = 2;");
+            $this->pdo->exec("DELETE FROM `t_user` WHERE `id` > 2;");
+            $this->pdo->exec("DELETE FROM `t_group` WHERE `id` > 5;");
+
+            $this->pdo->exec("ALTER TABLE `t_user` AUTO_INCREMENT = 2;");
+            $this->pdo->exec("ALTER TABLE `t_group` AUTO_INCREMENT = 5;");
         } catch (PDOException $pdoe) {
             return false;
         }
@@ -98,7 +96,14 @@
         fclose($handle);
     }
 
+    /**
+     * @param $table
+     * @param $cond
+     * @return array|null
+     */
     public function fetchAll($table, $cond) {
+        $this->logger->info(sprintf('%s(%s, %s) ', __METHOD__, $table, $cond));
+
         return $this->fetch($table, $cond);
     }
 
@@ -108,6 +113,8 @@
      * @return array|null
      */
     public function fetch($table, $cond) {
+        $this->logger->info(sprintf('%s(%s, %s) ', __METHOD__, $table, $cond));
+
         $stmt = $this->pdo->prepare(sprintf('
             SELECT
                 *
@@ -158,7 +165,14 @@
         fclose($handle);
     }
 
+    /**
+     * @param $table
+     * @param $id
+     * @return mixed|null
+     */
     public function find($table, $id) {
+        $this->logger->info(sprintf('%s(%s, %d) ', __METHOD__, $table, $id));
+
         $stmt = $this->pdo->prepare(
             sprintf('
               SELECT
@@ -180,7 +194,14 @@
         return null;
     }
 
+    /**
+     * @param $table
+     * @param $sys
+     * @return array|null
+     */
     public function findAll($table, $sys) {
+        $this->logger->info(sprintf('%s(%s, %d) ', __METHOD__, $table, $sys));
+
         $stmt = $this->pdo->prepare(
             sprintf('
               SELECT
@@ -202,7 +223,15 @@
         return null;
     }
 
+    /**
+     * @param $table
+     * @param $field
+     * @param $value
+     * @return mixed|null
+     */
     public function findByField($table, $field, $value) {
+        $this->logger->info(sprintf('%s(%s, %s, %s) ', __METHOD__, $table, $field, $value));
+
         $stmt = $this->pdo->prepare(
             sprintf('
               SELECT
@@ -223,7 +252,15 @@
         return null;
     }
 
+    /**
+     * @param $table
+     * @param $field
+     * @param $value
+     * @return array|null
+     */
     function findAllByField($table, $field, $value) {
+        $this->logger->info(sprintf('%s(%s, %s, %s) ', __METHOD__, $table, $field, $value));
+
         $stmt = $this->pdo->prepare(
             sprintf('
               SELECT
@@ -244,7 +281,13 @@
         return null;
     }
 
+    /**
+     * @param $sql
+     * @return array|null
+     */
     public function query($sql) {
+        $this->logger->info(sprintf('%s(%s, %s) ', __METHOD__, $sql));
+
         $stmt = $this->pdo->query($sql);
 
         if ($stmt) {
@@ -254,6 +297,11 @@
         return null;
     }
 
+    /**
+     * @param $table
+     * @param $array
+     * @return int
+     */
     public function persist($table, $array) {
         $this->logger->info(sprintf('%s(%s, %s) ', __METHOD__, $table, print_r($array, true)));
 
@@ -283,6 +331,12 @@
         return $this->pdo->exec($sql);
     }
 
+    /**
+     * @param $table
+     * @param $id
+     * @param $array
+     * @return int
+     */
     public function store($table, $id, $array) {
         $this->logger->info(sprintf('%s(%s, %d, %s) ', __METHOD__, $table, $id, print_r($array, true)));
 
@@ -304,6 +358,11 @@
         return $this->pdo->exec($sql);
     }
 
+    /**
+     * @param $table
+     * @param $id
+     * @return int
+     */
     public function delete($table, $id) {
         $this->logger->info(sprintf('%s(%s, %s) ', __METHOD__, $table, $id));