Fully implement snip db storage

src/Entity/SnipContent.php

@@ -7,14 +7,16 @@ use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\DBAL\Types\Types;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Types\UlidType;
 use Symfony\Component\Uid\Ulid;
 
 #[ORM\Entity(repositoryClass: SnipContentRepository::class)]
 class SnipContent
 {
     #[ORM\Id]
-    #[ORM\GeneratedValue]
-    #[ORM\Column]
+    #[ORM\Column(type: UlidType::NAME, unique: true)]
+    #[ORM\GeneratedValue(strategy: 'CUSTOM')]
+    #[ORM\CustomIdGenerator(class: 'doctrine.ulid_generator')]
     private ?Ulid $id = null;
 
     #[ORM\ManyToOne(inversedBy: 'snipContents')]