Add task transitions history

app/Subscriber/TransitionSubscriber.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Subscriber;
+
+use Event\TaskEvent;
+use Model\Task;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+class TransitionSubscriber extends Base implements EventSubscriberInterface
+{
+    public static function getSubscribedEvents()
+    {
+        return array(
+            Task::EVENT_MOVE_COLUMN => array('execute', 0),
+        );
+    }
+
+    public function execute(TaskEvent $event)
+    {
+        $user_id = $this->userSession->getId();
+
+        if (! empty($user_id)) {
+            $this->transition->save($user_id, $event->getAll());
+        }
+    }
+}