feat: add AI catalog description generation

backend/test/catalog-postgres-access.test.ts

@@ -169,3 +169,23 @@ test("connects pg through OpenSSH, supplies askpass, and releases all secret lea
   expect(child.kill).toHaveBeenCalledWith("SIGTERM");
   expect(leasedPaths.some(existsSync)).toBe(false);
 });
+
+test("fails before creating a transport when the sampling signal is already aborted", async () => {
+  const store = secretStore();
+  store.putMany("psd-clinical", {
+    [CATALOG_SECRET_IDS.password]: "db-password",
+    [CATALOG_SECRET_IDS.sshPrivateKey]: "PRIVATE KEY\n",
+    [CATALOG_SECRET_IDS.sshKnownHosts]: "bastion.internal ssh-ed25519 AAAATEST\n",
+  });
+  const spawnSsh = vi.fn(() => fakeChild());
+  const createClient = vi.fn();
+  const access = new ConcreteCatalogPostgresAccess(store, { spawnSsh, createClient });
+  const controller = new AbortController();
+  controller.abort();
+
+  await expect(access.connect(sshDatabase(), controller.signal)).rejects.toThrow(
+    "PostgreSQL connector aborted",
+  );
+  expect(spawnSsh).not.toHaveBeenCalled();
+  expect(createClient).not.toHaveBeenCalled();
+});