diff --git a/packages/data-schemas/src/app/interface.spec.ts b/packages/data-schemas/src/app/interface.spec.ts
new file mode 100644
index 0000000000..3d59f394a5
--- /dev/null
+++ b/packages/data-schemas/src/app/interface.spec.ts
@@ -0,0 +1,29 @@
+import { getConfigDefaults } from 'librechat-data-provider';
+import type { TCustomConfig } from 'librechat-data-provider';
+import { loadDefaultInterface } from './interface';
+
+describe('loadDefaultInterface', () => {
+  it('preserves the configured temporary chat retention period', async () => {
+    const config: Partial<TCustomConfig> = {
+      interface: {
+        temporaryChatRetention: 24,
+      },
+    };
+
+    const interfaceConfig = await loadDefaultInterface({
+      config,
+      configDefaults: getConfigDefaults(),
+    });
+
+    expect(interfaceConfig?.temporaryChatRetention).toBe(24);
+  });
+
+  it('omits temporary chat retention when it is not explicitly configured', async () => {
+    const interfaceConfig = await loadDefaultInterface({
+      config: {},
+      configDefaults: getConfigDefaults(),
+    });
+
+    expect(interfaceConfig).not.toHaveProperty('temporaryChatRetention');
+  });
+});
diff --git a/packages/data-schemas/src/app/interface.ts b/packages/data-schemas/src/app/interface.ts
index 8768f6fcae..f5ea50fb25 100644
--- a/packages/data-schemas/src/app/interface.ts
+++ b/packages/data-schemas/src/app/interface.ts
@@ -39,13 +39,14 @@ export async function loadDefaultInterface({
     mcpServers: interfaceConfig?.mcpServers ?? defaults.mcpServers,
     customWelcome: interfaceConfig?.customWelcome ?? defaults.customWelcome,
 
-    // Permissions - only include if explicitly configured
+    // Permissions and related settings - only include if explicitly configured
     bookmarks: interfaceConfig?.bookmarks,
     memories: shouldDisableMemories ? false : interfaceConfig?.memories,
     prompts: interfaceConfig?.prompts,
     multiConvo: interfaceConfig?.multiConvo,
     agents: interfaceConfig?.agents,
     temporaryChat: interfaceConfig?.temporaryChat,
+    temporaryChatRetention: interfaceConfig?.temporaryChatRetention,
     runCode: interfaceConfig?.runCode,
     webSearch: interfaceConfig?.webSearch,
     fileSearch: interfaceConfig?.fileSearch,