wip: guest account registration (self-service and booking create flow)

migrations/Version20260529130000.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260529130000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add guest invite expiry and activation timestamps to users';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE user ADD welcome_activation_expires_at DATETIME DEFAULT NULL');
+        $this->addSql('ALTER TABLE user ADD welcome_activated_at DATETIME DEFAULT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE user DROP welcome_activated_at');
+        $this->addSql('ALTER TABLE user DROP welcome_activation_expires_at');
+    }
+}