feat: collect assignment and disposition events for statistics

migrations/Version20260826000000.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * The append-only store behind the assignment and disposition statistics.
+ *
+ * Written by hand rather than diffed: the schema carries unrelated drift (JSON column
+ * comments, a messenger index) that a generated diff would sweep in alongside this table.
+ */
+final class Version20260826000000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Create statistics_event, the append-only store for assignment and disposition metrics';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql(<<<'SQL'
+            CREATE TABLE statistics_event (
+                id INT AUTO_INCREMENT NOT NULL,
+                name VARCHAR(64) NOT NULL,
+                occurred_at DATETIME NOT NULL COMMENT '(DC2Type:datetime_immutable)',
+                actor_id INT DEFAULT NULL,
+                actor_label VARCHAR(180) DEFAULT NULL,
+                actor_role VARCHAR(32) DEFAULT NULL,
+                assignment_id INT DEFAULT NULL,
+                disposition_id INT DEFAULT NULL,
+                application_id INT DEFAULT NULL,
+                teamer_id INT DEFAULT NULL,
+                destination_id INT DEFAULT NULL,
+                job_profile_id INT DEFAULT NULL,
+                hotel_code VARCHAR(8) DEFAULT NULL,
+                payload JSON NOT NULL,
+                INDEX IDX_A343D13C5E237E0687C03D1B (name, occurred_at),
+                INDEX IDX_A343D13C5E237E06C0D0E610 (name, hotel_code),
+                INDEX IDX_A343D13CD19302F8 (assignment_id),
+                INDEX IDX_A343D13C4302FF75 (teamer_id),
+                PRIMARY KEY(id)
+            ) DEFAULT CHARACTER SET utf8mb4 COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB
+        SQL);
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP TABLE statistics_event');
+    }
+}