refactor: derive the bus escort from the travel date

migrations/Version20261016090000.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Drops the staffing matrix's Busbegleitung flag.
+ *
+ * Whether a date gets a bus escort follows from the date itself: one with boarding points has
+ * bus travel, and App\Service\Assignment\AssignmentPlanner pre-selects the first of them. A flag
+ * per product could only repeat that, and less precisely, since bus travel varies between the
+ * dates of one product.
+ *
+ * Written by hand rather than taken from doctrine:migrations:diff, which also carries the
+ * pre-existing drift of the dev database.
+ */
+final class Version20261016090000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Drop staffing_rule.bus_escort';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE staffing_rule DROP bus_escort');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE staffing_rule ADD bus_escort TINYINT NOT NULL');
+    }
+}