diff --git a/migrations/Version20240926085224.php b/migrations/Version20240926085224.php
new file mode 100644
index 0000000..b05ce37
--- /dev/null
+++ b/migrations/Version20240926085224.php
@@ -0,0 +1,35 @@
+<?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 Version20240926085224 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 remote_calendar_rule DROP FOREIGN KEY FK_EE93D058C56641EE');
+        $this->addSql('ALTER TABLE remote_calendar_rule CHANGE remote_calendar_id remote_calendar_id INT NOT NULL');
+        $this->addSql('ALTER TABLE remote_calendar_rule ADD CONSTRAINT FK_EE93D058C56641EE FOREIGN KEY (remote_calendar_id) REFERENCES remote_calendar (id) ON DELETE CASCADE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE remote_calendar_rule DROP FOREIGN KEY FK_EE93D058C56641EE');
+        $this->addSql('ALTER TABLE remote_calendar_rule CHANGE remote_calendar_id remote_calendar_id INT DEFAULT NULL');
+        $this->addSql('ALTER TABLE remote_calendar_rule ADD CONSTRAINT FK_EE93D058C56641EE FOREIGN KEY (remote_calendar_id) REFERENCES remote_calendar (id)');
+    }
+}
diff --git a/src/Entity/RemoteCalendarRule.php b/src/Entity/RemoteCalendarRule.php
index 6b5a05f..419fa56 100644
--- a/src/Entity/RemoteCalendarRule.php
+++ b/src/Entity/RemoteCalendarRule.php
@@ -10,6 +10,7 @@ use Doctrine\ORM\Mapping as ORM;
 class RemoteCalendarRule extends AbstractEntity
 {
     #[ORM\ManyToOne(inversedBy: 'rules')]
+    #[ORM\JoinColumn(nullable: false, onDelete: 'CASCADE')]
     private ?RemoteCalendar $remoteCalendar = null;
 
     #[ORM\Column(type: Types::JSON, nullable: true)]