diff --git a/server.js b/server.js
index ef1150f..91c751a 100644
--- a/server.js
+++ b/server.js
@@ -47,7 +47,7 @@ async function store(event) {
       value: event.value, unit: event.unit, location: event.location, timestamp: event.timestamp,
     }));
     await r.hIncrBy("iot:counters", event.device_type, 1);
-    await r.zAdd("iot:recent", [{ score: 0, value: JSON.stringify(event) }]);
+    await r.zAdd("iot:recent", [{ score: Date.now(), value: JSON.stringify(event) }]);
     await r.zRemRangeByRank("iot:recent", 0, -1001);
   } catch (e) { console.error("Redis error:", e.message); }