feat: better error message

src/main/webapp/src/App.jsx

@@ -80,6 +80,14 @@ function Root() {
         check_validity(data => dispatch({type: 'init', val: data}))
     }, []);
 
+
+    useEffect(() => {
+        const interval = setInterval(() => {
+            check_validity(data => dispatch({type: 'update', val: data}))
+        }, 1000 * 60 * 9)
+        return () => clearInterval(interval)
+    }, []);
+
     return <>
         <header>
             <Nav/>