diff --git a/migrations/Version20250222165240.php b/migrations/Version20250222165240.php
new file mode 100644
index 00000000..5dd73d44
--- /dev/null
+++ b/migrations/Version20250222165240.php
@@ -0,0 +1,31 @@
+<?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 Version20250222165240 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Migrate the old attachment class discriminator values from legacy Part-DB to the modern format, so that there is just one unified value';
+    }
+
+    public function up(Schema $schema): void
+    {
+        //Change the old discriminator values to the new ones
+        $this->addSql('UPDATE attachments SET class_name = "Part" WHERE class_name = "PartDB\Part"');
+        $this->addSql('UPDATE attachments SET class_name = "Device" WHERE class_name = "PartDB\Device"');
+    }
+
+    public function down(Schema $schema): void
+    {
+        //No down required, as the new format can also be read by older Part-DB version
+    }
+}
diff --git a/src/Entity/Attachments/Attachment.php b/src/Entity/Attachments/Attachment.php
index 3c8d890d..4847eea5 100644
--- a/src/Entity/Attachments/Attachment.php
+++ b/src/Entity/Attachments/Attachment.php
@@ -96,8 +96,8 @@ use LogicException;
 #[DiscriminatorMap(typeProperty: '_type', mapping: self::API_DISCRIMINATOR_MAP)]
 abstract class Attachment extends AbstractNamedDBElement
 {
-    private const ORM_DISCRIMINATOR_MAP = ['PartDB\Part' => PartAttachment::class, 'Part' => PartAttachment::class,
-        'PartDB\Device' => ProjectAttachment::class, 'Device' => ProjectAttachment::class, 'AttachmentType' => AttachmentTypeAttachment::class,
+    private const ORM_DISCRIMINATOR_MAP = ['Part' => PartAttachment::class, 'Device' => ProjectAttachment::class,
+        'AttachmentType' => AttachmentTypeAttachment::class,
         'Category' => CategoryAttachment::class, 'Footprint' => FootprintAttachment::class, 'Manufacturer' => ManufacturerAttachment::class,
         'Currency' => CurrencyAttachment::class, 'Group' => GroupAttachment::class, 'MeasurementUnit' => MeasurementUnitAttachment::class,
         'Storelocation' => StorageLocationAttachment::class, 'Supplier' => SupplierAttachment::class,