feat: add metadata catalog cleanup commands

backend/test/catalog-operation-coordinator.test.ts

@@ -0,0 +1,20 @@
+import { expect, test } from "vitest";
+import { CatalogOperationCoordinator } from "../src/catalog/operation-coordinator.js";
+
+test("releases earlier database reservations when a batch reservation cannot be completed", async () => {
+  const coordinator = new CatalogOperationCoordinator();
+  const releaseBusyDatabase = coordinator.reserve("database-b");
+
+  await expect(coordinator.runMany(["database-a", "database-b"], async () => "unreachable"))
+    .rejects.toThrow("A database operation is already in progress");
+
+  expect(await coordinator.run("database-a", async () => "available")).toBe("available");
+  releaseBusyDatabase();
+});
+
+test("reserves duplicate database ids only once for a batch operation", async () => {
+  const coordinator = new CatalogOperationCoordinator();
+
+  expect(await coordinator.runMany(["database-a", "database-a"], async () => "completed"))
+    .toBe("completed");
+});