fix schule issue and contianer type issue

apps/edr-freight-api/src/migrations/2290000000000-DropContainerWagonsPerUnit.ts

@@ -0,0 +1,29 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * container_types.wagons_per_unit is no longer stored: the wagon fraction is
+ * derived from size_ft everywhere (40ft = 1.00 wagon, 20ft = 0.50 — two per
+ * wagon; see rule-engine/container-type.util.ts). The stored value duplicated
+ * that rule and could silently drift from it.
+ */
+export class DropContainerWagonsPerUnit2290000000000 implements MigrationInterface {
+  name = 'DropContainerWagonsPerUnit2290000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.container_types DROP COLUMN IF EXISTS wagons_per_unit;
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.container_types
+        ADD COLUMN IF NOT EXISTS wagons_per_unit numeric(4,2);
+    `);
+    // Backfill from the same size rule the code now derives from.
+    await queryRunner.query(`
+      UPDATE freight.container_types
+         SET wagons_per_unit = CASE WHEN size_ft >= 40 THEN 1.00 ELSE 0.50 END;
+    `);
+  }
+}