diff --git a/frontend/assets/js/app.js b/frontend/assets/js/app.js
index db58a00..54e4df1 100644
--- a/frontend/assets/js/app.js
+++ b/frontend/assets/js/app.js
@@ -39,6 +39,53 @@ let syncInterval = null;
 let syncHashes = { events: null, documents: null, network: null };
 let pendingCanvasCreate = null;
 
+function startSync() {
+    if (syncInterval) return;
+    syncInterval = setInterval(async () => {
+        if (dragType || dragTarget || isPanning) return;
+        const openModals = document.querySelectorAll('.modal.show');
+        if (openModals.length > 0) return;
+        try {
+            const [eventsData, docsData, nodesData, linksData, shapesData] = await Promise.all([
+                apiFetch('events'),
+                apiFetch('documents'),
+                apiFetch('nodes'),
+                apiFetch('links'),
+                apiFetch('shapes'),
+            ]);
+
+            const eventsHash = JSON.stringify(eventsData);
+            if (eventsHash !== syncHashes.events) {
+                syncHashes.events = eventsHash;
+                events = Array.isArray(eventsData) ? eventsData : [];
+                loadAllTags();
+                renderTimeline();
+            }
+
+            const docsHash = JSON.stringify(docsData);
+            if (docsHash !== syncHashes.documents) {
+                syncHashes.documents = docsHash;
+                documents = Array.isArray(docsData) ? docsData : [];
+                renderDocuments();
+            }
+
+            const netHash = JSON.stringify({ n: nodesData, l: linksData, s: shapesData });
+            if (netHash !== syncHashes.network) {
+                syncHashes.network = netHash;
+                nodes = Array.isArray(nodesData) ? nodesData : [];
+                links = Array.isArray(linksData) ? linksData : [];
+                shapes = Array.isArray(shapesData) ? shapesData : [];
+                populateNodeSelects();
+                renderNodeList();
+                renderShapeList();
+                if (shapes.length) nextShapeZ = Math.max(...shapes.map(x => x.z_index)) + 1;
+                buildCanvasGraph();
+                renderNetwork();
+            }
+        } catch (e) {}
+    }, 5000);
+}
+
 const DOC_TYPE_ICONS = {
     deployment: { icon: 'fa-server', color: '#06b6d4' },
     attack: { icon: 'fa-bolt', color: '#ef4444' },