Fix Proxmox sync jump host persistence (#1303)

src/backend/tests/database/routes/proxmox-jump-hosts.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from "vitest";
+import {
+  parseProxmoxJumpHosts,
+  serializeProxmoxJumpHosts,
+} from "../../../database/routes/proxmox-jump-hosts.js";
+
+describe("Proxmox jump-host persistence", () => {
+  const jumpHosts = [{ hostId: 7 }, { hostId: 9 }];
+
+  it("serializes resolved arrays before inserting a synced guest", () => {
+    expect(serializeProxmoxJumpHosts(jumpHosts)).toBe(
+      '[{"hostId":7},{"hostId":9}]',
+    );
+  });
+
+  it("keeps stored JSON strings stable", () => {
+    const stored = '[{"hostId":7}]';
+    expect(serializeProxmoxJumpHosts(stored)).toBe(stored);
+    expect(parseProxmoxJumpHosts(stored)).toEqual([{ hostId: 7 }]);
+  });
+
+  it("turns missing or malformed values into null", () => {
+    expect(serializeProxmoxJumpHosts(null)).toBeNull();
+    expect(serializeProxmoxJumpHosts("invalid")).toBeNull();
+  });
+});