diff --git a/migrations/Version20220213005422.php b/migrations/Version20220213005422.php
new file mode 100644
index 0000000000000000000000000000000000000000..331b38512a1ee7e69118c004756427f25b69b21e
--- /dev/null
+++ b/migrations/Version20220213005422.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20220213005422 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE "user" ADD completion_counter INT NOT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE SCHEMA public');
+        $this->addSql('ALTER TABLE "user" DROP completion_counter');
+    }
+}
diff --git a/src/Controller/CalendarController.php b/src/Controller/CalendarController.php
index d3d22e7b56c094ee56799a1c7c0ea11214eadfff..3e7257a56d92af709fcc7658548e21d6b1b6d344 100644
--- a/src/Controller/CalendarController.php
+++ b/src/Controller/CalendarController.php
@@ -55,4 +55,23 @@ class CalendarController extends AbstractController
 
         return new Response("all good");
     }
+    
+    #[Route('/calendar/send_click', name: 'calendar_send_click')]
+    #[IsGranted('ROLE_USER')]
+    public function calendarSendClick(EntityManagerInterface $manager)
+    {
+        /** @var User */
+        $user = $this->getUser();
+        if (!$user || !$user instanceof User)
+        {
+            throw new \LogicException("The button could not be pressed because there are no existing user.");
+        }
+
+        $completionCunter = $user->getCompletionCounter();
+        $user->setCompletionCounter($completionCunter++);
+        $manager->flush();
+
+        return new JsonResponse(["score", $user->calculateScore()]);
+    }
+
 }
diff --git a/src/Entity/User.php b/src/Entity/User.php
index 84635275cfa0ed95a2c2ce33c41ff50a3a94b6e1..a68769476890f21b7c3431d58e040e1c0d3f5010 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -29,7 +29,10 @@ class User implements UserInterface, PasswordAuthenticatedUserInterface
     private $displayName;
 
     #[ORM\Column(type: 'json', nullable: true)]
-    private $CalendarFile = [];
+    private $calendarFile = [];
+
+    #[ORM\Column(type: 'integer')]
+    private $completionCounter = 0;
 
     public function getId(): ?int
     {
@@ -115,13 +118,30 @@ class User implements UserInterface, PasswordAuthenticatedUserInterface
 
     public function getCalendarFile(): ?array
     {
-        return $this->CalendarFile;
+        return $this->calendarFile;
     }
 
-    public function setCalendarFile(?array $CalendarFile): self
+    public function setCalendarFile(?array $calendarFile): self
     {
-        $this->CalendarFile = $CalendarFile;
+        $this->calendarFile = $calendarFile;
 
         return $this;
     }
+
+    public function getCompletionCounter(): ?int
+    {
+        return $this->completionCounter;
+    }
+
+    public function setCompletionCounter(int $completionCounter): self
+    {
+        $this->completionCounter = $completionCounter;
+
+        return $this;
+    }
+
+    public function calculateScore(): ?float
+    {
+        return log($this->completionCounter);
+    }
 }