Make path field unique in invoices and update migration logic

Author: tomkalon

config/doctrine/Invoice.orm.xml

@@ -10,7 +10,7 @@
         <field name="localeCode" column="locale_code" />
         <field name="total" column="total" type="integer" />
         <field name="paymentState" column="payment_state" />
-        <field name="path" column="path" />
+        <field name="path" column="path" unique="true" />
 
         <one-to-one field="billingData" target-entity="Sylius\InvoicingPlugin\Entity\BillingDataInterface">
             <cascade>

src/Generator/InvoiceFileNameGeneratorInterface.php

@@ -13,8 +13,6 @@
 
 namespace Sylius\InvoicingPlugin\Generator;
 
-use Sylius\InvoicingPlugin\Entity\InvoiceInterface;
-
 interface InvoiceFileNameGeneratorInterface
 {
     public function generateForPdf(string $invoiceNumber): string;

src/Migrations/Version20251023082457.php

@@ -20,16 +20,18 @@ final class Version20251023082457 extends AbstractMigration
 {
     public function getDescription(): string
     {
-        return 'Add path column to sylius_invoicing_plugin_invoice table to store invoice file paths';
+        return 'Add path field to sylius_invoicing_plugin_invoice table';
     }
 
     public function up(Schema $schema): void
     {
         $this->addSql('ALTER TABLE sylius_invoicing_plugin_invoice ADD path VARCHAR(255) NOT NULL');
+        $this->addSql('CREATE UNIQUE INDEX UNIQ_3AA279BFB548B0F ON sylius_invoicing_plugin_invoice (path)');
     }
 
     public function down(Schema $schema): void
     {
+        $this->addSql('DROP INDEX UNIQ_3AA279BFB548B0F ON sylius_invoicing_plugin_invoice');
         $this->addSql('ALTER TABLE sylius_invoicing_plugin_invoice DROP path');
     }
 }