feat: replace custom discount with absolute value in favor of percentage

migrations/Version20260908161500.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * The percentage column is dropped rather than converted: it shipped with Version20260908145156
+ * but no booking was ever given a value, so there is nothing to carry over.
+ */
+final class Version20260908161500 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Store the accommodation booking total discount as an absolute amount in minor units instead of a percentage';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE accommodation_booking DROP total_discount, ADD total_discount_amount INT DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE accommodation_booking DROP total_discount_amount, ADD total_discount INT DEFAULT NULL');
+    }
+}