devices listing now looks at the timestamp of status readings to determine if a column should exist

src/common/StatusDust.tsx

@@ -114,6 +114,29 @@ export default function StatusDust(props: Props) {
     )
   }
 
+  function compareTimestamps(timestamp1: string, timestamp2: string): number {
+    const date1 = new Date(timestamp1);
+    const date2 = new Date(timestamp2);
+
+    // Check if dates are valid
+    if (isNaN(date1.getTime()) || isNaN(date2.getTime())) {
+      throw new Error("Invalid RFC3339 timestamp format");
+    }
+
+    // Compare using getTime() for millisecond precision
+    return date1.getTime() - date2.getTime();
+  }
+
+  if (device.status.sen5x?.timestamp) {
+    const now = new Date();
+    const oneDayAgo = new Date(now.getTime() - 24 * 60 * 60 * 1000);
+    if (compareTimestamps(device.status.sen5x?.timestamp, oneDayAgo.toISOString()) < 0) {
+      return null
+    } 
+  } else {
+    return null
+  }
+
   return (
     <Tooltip title={tooltip()}>
       <PulseBox color={color} className={classes.box} >