feat: add bus-only travel mailing lists

migrations/Version20261109074654.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20261109074654 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Allows a bus-only travel mailing list next to the full one: adds bus_leg and the list name, which replaces travel_code as the unique key.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE travel_mailing_list ADD bus_leg VARCHAR(20) DEFAULT NULL, ADD name VARCHAR(64) DEFAULT NULL');
+        // Every existing list holds all participants and is named by its travel code alone.
+        $this->addSql('UPDATE travel_mailing_list SET name = travel_code');
+        $this->addSql('ALTER TABLE travel_mailing_list MODIFY name VARCHAR(64) NOT NULL');
+        $this->addSql('CREATE UNIQUE INDEX UNIQ_68DC6E285E237E06 ON travel_mailing_list (name)');
+        $this->addSql('ALTER TABLE travel_mailing_list DROP INDEX UNIQ_68DC6E28BC4DD335, ADD INDEX IDX_68DC6E28BC4DD335 (travel_code)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // Fails while a travel has two lists; delete the bus-only one first.
+        $this->addSql('ALTER TABLE travel_mailing_list DROP INDEX IDX_68DC6E28BC4DD335, ADD UNIQUE INDEX UNIQ_68DC6E28BC4DD335 (travel_code)');
+        $this->addSql('DROP INDEX UNIQ_68DC6E285E237E06 ON travel_mailing_list');
+        $this->addSql('ALTER TABLE travel_mailing_list DROP bus_leg, DROP name');
+    }
+}