message decay logic

src/lib/Firebase/messages.js

@@ -14,9 +14,23 @@ export async function getNearbyMessages(lat, lng) {
     );
 
     const snapshot = await getDocs(q);
-    return snapshot.docs.map(doc => ({ id: doc.id, ...doc.data() }));
+    const all = snapshot.docs.map(doc => ({ id: doc.id, ...doc.data() })); 
+
+    // we filter out messages which have already expired (past their echo date)
+    const now = Date.now();
+    const active = all.filter(message => { 
+        const echoTime = message.lastEchoAt?.toMillis() ?? message.createdAt.toMillis();
+        const daysSinceEcho = (now - echoTime) / (1000 * 60 * 60 * 24);
+
+        //console.log(message.text.slice(0, 20), '→ days since echo:', daysSinceEcho);
+
+        return daysSinceEcho < 30; // less than 30 means it lives / is active
+    });
+
+    return active;
 }
 
+
 export async function echoMessage(messageId) {
     const ref = doc(db, 'messages', messageId);
     await updateDoc(ref, {

src/lib/components/MapView.Svelte

@@ -12,6 +12,7 @@
     let mapDiv;
 
     let markers = []; // keep track of pins on map
+    let userMarker;
 
 
     /** Jisu Legacy - 내 위치 마커 (메시지 핀과 구분되는 파란 점) */