diff --git a/src/handler/point.rs b/src/handler/point.rs
index 5ba5385..f2401f5 100644
--- a/src/handler/point.rs
+++ b/src/handler/point.rs
@@ -161,12 +161,14 @@ pub struct UpdatePointReq {
 /// Request payload for batch setting point tags.
 #[derive(Deserialize, Validate)]
 pub struct BatchSetPointTagsReq {
+    #[validate(length(min = 1, max = 500))]
     pub point_ids: Vec<Uuid>,
     pub tag_id: Option<Uuid>,
 }
 
 #[derive(Deserialize, Validate)]
 pub struct BatchSetPointEquipmentReq {
+    #[validate(length(min = 1, max = 500))]
     pub point_ids: Vec<Uuid>,
     pub equipment_id: Option<Uuid>,
     pub signal_role: Option<String>,
@@ -448,6 +450,7 @@ pub async fn delete_point(
 #[derive(Deserialize, Validate)]
 /// Request payload for batch point creation from node ids.
 pub struct BatchCreatePointsReq {
+    #[validate(length(min = 1, max = 500))]
     pub node_ids: Vec<Uuid>,
 }
 
@@ -563,6 +566,7 @@ pub async fn batch_create_points(
 #[derive(Deserialize, Validate)]
 /// Request payload for batch point deletion.
 pub struct BatchDeletePointsReq {
+    #[validate(length(min = 1, max = 500))]
     pub point_ids: Vec<Uuid>,
 }
 
diff --git a/src/handler/source.rs b/src/handler/source.rs
index 1d8b361..dfb8e02 100644
--- a/src/handler/source.rs
+++ b/src/handler/source.rs
@@ -171,23 +171,24 @@ fn build_node_tree(nodes: Vec<Node>) -> Vec<TreeNode> {
         id: Uuid,
         node_map: &mut HashMap<Uuid, TreeNode>,
         children_map: &HashMap<Uuid, Vec<Uuid>>,
-    ) -> TreeNode {
-        let mut node = node_map.remove(&id).unwrap();
+    ) -> Option<TreeNode> {
+        let mut node = node_map.remove(&id)?;
 
         if let Some(child_ids) = children_map.get(&id) {
             for &cid in child_ids {
-                let child = attach_children(cid, node_map, children_map);
-                node.children.push(child);
+                if let Some(child) = attach_children(cid, node_map, children_map) {
+                    node.children.push(child);
+                }
             }
         }
 
-        node
+        Some(node)
     }
 
     // ③ 生成最终树
     roots
         .into_iter()
-        .map(|rid| attach_children(rid, &mut node_map, &children_map))
+        .filter_map(|rid| attach_children(rid, &mut node_map, &children_map))
         .collect()
 }
 
diff --git a/web/js/events.js b/web/js/events.js
index 91c96b2..f391b2e 100644
--- a/web/js/events.js
+++ b/web/js/events.js
@@ -71,6 +71,10 @@ export function prependEvent(item) {
   if (placeholder) placeholder.remove();
 
   dom.eventList.insertBefore(makeCard(item), dom.eventList.firstChild);
+
+  // Keep DOM bounded to prevent unbounded growth
+  const cards = dom.eventList.querySelectorAll(".event-card");
+  if (cards.length > 100) cards[cards.length - 1].remove();
 }
 
 dom.eventList.addEventListener("scroll", () => {
diff --git a/web/js/logs.js b/web/js/logs.js
index ed96c38..fdf55ad 100644
--- a/web/js/logs.js
+++ b/web/js/logs.js
@@ -79,12 +79,17 @@ function setWsStatus(connected) {
   }
 }
 
+let _reconnectDelay = 1000;
+
 export function startPointSocket() {
   const protocol = location.protocol === "https:" ? "wss" : "ws";
   const ws = new WebSocket(`${protocol}://${location.host}/ws/public`);
   state.pointSocket = ws;
 
-  ws.onopen = () => setWsStatus(true);
+  ws.onopen = () => {
+    setWsStatus(true);
+    _reconnectDelay = 1000;
+  };
 
   ws.onmessage = (event) => {
     try {
@@ -101,12 +106,14 @@ export function startPointSocket() {
           entry.time.textContent = data.timestamp || "--";
         }
 
-        // ops view signal cell
+        // ops view signal dot
         const opsEntry = state.opsPointEls.get(data.point_id);
         if (opsEntry) {
-          opsEntry.valueEl.textContent = formatValue(data);
-          opsEntry.qualityEl.className = `badge quality-${(data.quality || "unknown").toLowerCase()}`;
-          opsEntry.qualityEl.textContent = (data.quality || "unknown").toUpperCase();
+          const { dotEl } = opsEntry;
+          const role = dotEl.dataset.opsRole;
+          import("./ops.js").then(({ sigDotClass }) => {
+            dotEl.className = sigDotClass(role, data.quality, data.value_text);
+          });
         }
 
         if (state.chartPointId === data.point_id) {
@@ -137,7 +144,8 @@ export function startPointSocket() {
 
   ws.onclose = () => {
     setWsStatus(false);
-    window.setTimeout(startPointSocket, 2000);
+    window.setTimeout(startPointSocket, _reconnectDelay);
+    _reconnectDelay = Math.min(_reconnectDelay * 2, 30000);
   };
 
   ws.onerror = () => setWsStatus(false);
diff --git a/web/js/ops.js b/web/js/ops.js
index 6080ef3..410c1ac 100644
--- a/web/js/ops.js
+++ b/web/js/ops.js
@@ -7,6 +7,14 @@ import { loadUnits } from "./units.js";
 const SIGNAL_ROLES = ["rem", "run", "flt"];
 const ROLE_LABELS = { rem: "REM", run: "RUN", flt: "FLT" };
 
+export function sigDotClass(role, quality, valueText) {
+  if (!quality || quality.toLowerCase() !== "good") return "sig-dot sig-warn";
+  const v = String(valueText ?? "").trim().toLowerCase();
+  const on = v === "1" || v === "true" || v === "on";
+  if (!on) return "sig-dot";
+  return role === "flt" ? "sig-dot sig-fault" : "sig-dot sig-on";
+}
+
 function runtimeBadge(runtime) {
   if (!runtime) return '<span class="badge offline">OFFLINE</span>';
   if (runtime.comm_locked) return '<span class="badge offline">COMM ERR</span>';
@@ -128,8 +136,7 @@ function renderOpsEquipments(equipments) {
       return `
         <div class="ops-signal-row">
           <span class="ops-signal-label">${ROLE_LABELS[role] || role}</span>
-          <span class="badge quality-unknown" data-ops-quality="${point.id}">?</span>
-          <span class="ops-signal-value" data-ops-value="${point.id}">--</span>
+          <span class="sig-dot sig-warn" data-ops-dot="${point.id}" data-ops-role="${role}"></span>
         </div>`;
     }).join("");
 
@@ -172,15 +179,12 @@ function renderOpsEquipments(equipments) {
     SIGNAL_ROLES.forEach((role) => {
       const point = roleMap[role];
       if (!point) return;
-      const valueEl = card.querySelector(`[data-ops-value="${point.id}"]`);
-      const qualityEl = card.querySelector(`[data-ops-quality="${point.id}"]`);
-      if (valueEl && qualityEl) {
-        state.opsPointEls.set(point.id, { valueEl, qualityEl });
+      const dotEl = card.querySelector(`[data-ops-dot="${point.id}"]`);
+      if (dotEl) {
+        state.opsPointEls.set(point.id, { dotEl });
         if (point.point_monitor) {
           const m = point.point_monitor;
-          valueEl.textContent = formatValue(m);
-          qualityEl.className = `badge quality-${(m.quality || "unknown").toLowerCase()}`;
-          qualityEl.textContent = (m.quality || "unknown").toUpperCase();
+          dotEl.className = sigDotClass(role, m.quality, m.value_text);
         }
       }
     });
diff --git a/web/styles.css b/web/styles.css
index 95cabb5..bfa9034 100644
--- a/web/styles.css
+++ b/web/styles.css
@@ -261,6 +261,18 @@ body {
   font-weight: 500;
 }
 
+.sig-dot {
+  width: 10px;
+  height: 10px;
+  border-radius: 50%;
+  flex-shrink: 0;
+  background: var(--text-3);
+  transition: background 0.2s;
+}
+.sig-dot.sig-on    { background: var(--success); }
+.sig-dot.sig-fault { background: var(--danger); }
+.sig-dot.sig-warn  { background: var(--warning); }
+
 .ops-eq-card-actions {
   padding: 6px 10px 8px;
   display: flex;