Set ON DELETE SET NULL for savedExport foreign key in ExportGeneration entity and related migration

src/Bundle/ChillMainBundle/Entity/ExportGeneration.php

@@ -58,11 +58,11 @@ class ExportGeneration implements TrackCreationInterface
         /**
          *  The related saved export.
          *
-         * Note that, in some case, the options of this ExportGenration are not equals to the options of the saved export.
+         * Note that, in some case, the options of this ExportGeneration are not equals to the options of the saved export.
          * This happens when the options of the saved export are updated.
          */
         #[ORM\ManyToOne(targetEntity: SavedExport::class)]
-        #[ORM\JoinColumn(nullable: true)]
+        #[ORM\JoinColumn(nullable: true, onDelete: 'SET NULL')]
         private ?SavedExport $savedExport = null,
     ) {
         $this->id = Uuid::uuid4();

src/Bundle/ChillMainBundle/migrations/Version20250617141354.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chill\Migrations\Main;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20250617141354 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'When a row in chill_main_saved_export is deleted, set the references to NULL in chill_main_export_generation table';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql(<<<'SQL'
+            ALTER TABLE chill_main_export_generation DROP CONSTRAINT FK_E644B77DA61D6F69
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE chill_main_export_generation ADD CONSTRAINT FK_E644B77DA61D6F69 FOREIGN KEY (savedExport_id) REFERENCES chill_main_saved_export (id) ON DELETE SET NULL NOT DEFERRABLE INITIALLY IMMEDIATE
+        SQL);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql(<<<'SQL'
+            ALTER TABLE chill_main_export_generation DROP CONSTRAINT fk_e644b77da61d6f69
+        SQL);
+        $this->addSql(<<<'SQL'
+            ALTER TABLE chill_main_export_generation ADD CONSTRAINT fk_e644b77da61d6f69 FOREIGN KEY (savedexport_id) REFERENCES chill_main_saved_export (id) NOT DEFERRABLE INITIALLY IMMEDIATE
+        SQL);
+    }
+}