diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index bdef820..1612a87 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,3 +1,3 @@
 {
-  "recommendations": ["svelte.svelte-vscode"]
+  "recommendations": []
 }
diff --git a/Vagrantfile b/Vagrantfile
index 05a8fd6..d52d88e 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -21,6 +21,7 @@ Vagrant.configure('2') do |config|
     if File.exist?('.vagrant.config.yml.dist')
         settingsDist = YAML.load(File.read('.vagrant.config.yml.dist'))
     end
+    # TODO: Handle empty file "in `merge': no implicit conversion of nil into Hash (TypeError)"
     if File.exist?('.vagrant.config.yml')
         settingsCustom = YAML.load(File.read('.vagrant.config.yml'))
     end
diff --git a/api/migrations/Version20240502173703.php b/api/migrations/Version20240502173703.php
new file mode 100644
index 0000000..05f64af
--- /dev/null
+++ b/api/migrations/Version20240502173703.php
@@ -0,0 +1,41 @@
+<?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 Version20240502173703 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Fix deletion of related entities on cascade';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE card DROP FOREIGN KEY FK_161498D3BC3F045D');
+        $this->addSql('ALTER TABLE card ADD CONSTRAINT FK_161498D3BC3F045D FOREIGN KEY (user_login_id) REFERENCES user (id) ON DELETE SET NULL');
+        $this->addSql('ALTER TABLE invitee DROP FOREIGN KEY FK_F7AADF3D759A837E');
+        $this->addSql('ALTER TABLE invitee DROP FOREIGN KEY FK_F7AADF3D4ACC9A20');
+        $this->addSql('ALTER TABLE invitee ADD CONSTRAINT FK_F7AADF3D759A837E FOREIGN KEY (table_to_sit_id) REFERENCES `table` (id) ON DELETE SET NULL');
+        $this->addSql('ALTER TABLE invitee ADD CONSTRAINT FK_F7AADF3D4ACC9A20 FOREIGN KEY (card_id) REFERENCES card (id) ON DELETE SET NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE invitee DROP FOREIGN KEY FK_F7AADF3D759A837E');
+        $this->addSql('ALTER TABLE invitee DROP FOREIGN KEY FK_F7AADF3D4ACC9A20');
+        $this->addSql('ALTER TABLE invitee ADD CONSTRAINT FK_F7AADF3D759A837E FOREIGN KEY (table_to_sit_id) REFERENCES `table` (id)');
+        $this->addSql('ALTER TABLE invitee ADD CONSTRAINT FK_F7AADF3D4ACC9A20 FOREIGN KEY (card_id) REFERENCES card (id)');
+        $this->addSql('ALTER TABLE card DROP FOREIGN KEY FK_161498D3BC3F045D');
+        $this->addSql('ALTER TABLE card ADD CONSTRAINT FK_161498D3BC3F045D FOREIGN KEY (user_login_id) REFERENCES user (id)');
+    }
+}
diff --git a/api/src/Entity/Card.php b/api/src/Entity/Card.php
index cca4d0c..ef5b877 100644
--- a/api/src/Entity/Card.php
+++ b/api/src/Entity/Card.php
@@ -20,8 +20,8 @@ class Card
     #[ORM\OneToMany(mappedBy: 'card', targetEntity: Invitee::class)]
     private Collection $invitees;
 
-    #[ORM\OneToOne(inversedBy: 'card', cascade: ['persist', 'remove'])]
-    #[ORM\JoinColumn(nullable: true)]
+    #[ORM\OneToOne(inversedBy: 'card', cascade: ['persist'])]
+    #[ORM\JoinColumn(nullable: true, onDelete: 'SET NULL')]
     private ?User $userLogin = null;
 
     public function __construct()
diff --git a/api/src/Entity/Invitee.php b/api/src/Entity/Invitee.php
index 5493efe..1a6f2b1 100644
--- a/api/src/Entity/Invitee.php
+++ b/api/src/Entity/Invitee.php
@@ -35,10 +35,11 @@ class Invitee
     private ?string $allergies = null;
 
     #[ORM\ManyToOne(inversedBy: 'invitees')]
-    #[ORM\JoinColumn(name: 'table_to_sit_id')]
+    #[ORM\JoinColumn(name: 'table_to_sit_id', onDelete: 'SET NULL')]
     private ?Table $table = null;
 
     #[ORM\ManyToOne(inversedBy: 'invitees')]
+    #[ORM\JoinColumn(onDelete: 'SET NULL')]
     private ?Card $card = null;
 
     public function __construct(string $firstname, string $lastname)
diff --git a/api/src/Entity/User.php b/api/src/Entity/User.php
index 8b11348..d2210a7 100644
--- a/api/src/Entity/User.php
+++ b/api/src/Entity/User.php
@@ -31,7 +31,7 @@ class User implements UserInterface, PasswordAuthenticatedUserInterface
     #[ORM\Column(nullable: false)]
     private string $password;
 
-    #[ORM\OneToOne(mappedBy: 'userLogin', cascade: ['persist', 'remove'])]
+    #[ORM\OneToOne(mappedBy: 'userLogin', cascade: ['persist'])]
     private ?Card $card = null;
 
     public function __construct(string $username, UserPasswordHasherInterface $passwordHasher, string $password)