diff --git a/public/js/app.js b/public/js/app.js
index 6b7fcde..8a896bb 100644
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -2151,6 +2151,7 @@
       if (dom.requireLoginForServerDetailsInput) dom.requireLoginForServerDetailsInput.value = settings.require_login_for_server_details ? "1" : "0";
       if (dom.showServerIpInput) dom.showServerIpInput.value = settings.show_server_ip ? "1" : "0";
       if (dom.cdnUrlInput) dom.cdnUrlInput.value = settings.cdn_url || '';
+      if (dom.prometheusCacheTtlInput) dom.prometheusCacheTtlInput.value = settings.prometheus_cache_ttl !== undefined ? settings.prometheus_cache_ttl : 30;
       
       // Handle Theme Priority: localStorage > Site Default
       const savedTheme = localStorage.getItem('theme');