fix: prevent duplicate events in database

src/Entity/DomainEvent.php

@@ -6,6 +6,9 @@ use App\Repository\DomainEventRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: DomainEventRepository::class)]
+#[ORM\UniqueConstraint(
+    columns: ['action', 'date', 'domain_id']
+)]
 class DomainEvent extends Event
 {
     #[ORM\ManyToOne(targetEntity: Domain::class, inversedBy: 'events')]