Fix ticket_id never stored when fail_thresh>1; guard sessionStorage JSON.parse

monitor.py: _ticket_interface/_ticket_unifi/_ticket_unreachable all used
`if tid and is_new` to guard db.set_ticket_id(). Since is_new is True only
on the first upsert (consec=1) but tickets are created at consec>=fail_thresh
(default 2), is_new is always False when the ticket is created, so the
ticket link never appeared in the UI. Changed to `if tid:`.

links.html: JSON.parse(sessionStorage.getItem(...)) in togglePanel and
restoreCollapseState had no try-catch. Corrupt/stale session storage would
throw an uncaught SyntaxError. Also wrapped all sessionStorage.setItem
calls in try-catch to defend against storage-full / private-browsing errors.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

monitor.py

@@ -789,7 +789,7 @@ class NetworkMonitor:
             f'Please inspect the cable/SFP/switch port for {host}/{iface}.'
         )
         tid = self.tickets.create(title, desc, priority='2')
-        if tid and is_new:
+        if tid:
             db.set_ticket_id(event_id, tid)
 
     # ------------------------------------------------------------------
@@ -831,7 +831,7 @@ class NetworkMonitor:
             f'Please check power and cable connectivity.'
         )
         tid = self.tickets.create(title, desc, priority='2')
-        if tid and is_new:
+        if tid:
             db.set_ticket_id(event_id, tid)
 
     # ------------------------------------------------------------------
@@ -873,7 +873,7 @@ class NetworkMonitor:
             f'Please check the host power, management interface, and network connectivity.'
         )
         tid = self.tickets.create(title, desc, priority='2')
-        if tid and is_new:
+        if tid:
             db.set_ticket_id(event_id, tid)
 
     # ------------------------------------------------------------------

templates/links.html

@@ -372,14 +372,16 @@ function togglePanel(panel) {
   if (title) title.setAttribute('aria-expanded', isCollapsed ? 'false' : 'true');
   const id = panel.id;
   if (id) {
-    const collapsed = JSON.parse(sessionStorage.getItem('linksCollapsed') || '{}');
+    let collapsed = {};
+    try { collapsed = JSON.parse(sessionStorage.getItem('linksCollapsed') || '{}'); } catch(_) {}
     collapsed[id] = panel.classList.contains('collapsed');
-    sessionStorage.setItem('linksCollapsed', JSON.stringify(collapsed));
+    try { sessionStorage.setItem('linksCollapsed', JSON.stringify(collapsed)); } catch(_) {}
   }
 }
 
 function restoreCollapseState() {
-  const collapsed = JSON.parse(sessionStorage.getItem('linksCollapsed') || '{}');
+  let collapsed = {};
+  try { collapsed = JSON.parse(sessionStorage.getItem('linksCollapsed') || '{}'); } catch(_) {}
   for (const [id, isCollapsed] of Object.entries(collapsed)) {
     const panel = document.getElementById(id);
     if (!panel) continue;
@@ -507,9 +509,11 @@ function collapseAll() {
     if (btn)   btn.textContent = '[+]';
     if (title) title.setAttribute('aria-expanded', 'false');
   });
-  sessionStorage.setItem('linksCollapsed', JSON.stringify(
-    Object.fromEntries([...document.querySelectorAll('.link-host-panel')].map(p => [p.id, true]))
-  ));
+  try {
+    sessionStorage.setItem('linksCollapsed', JSON.stringify(
+      Object.fromEntries([...document.querySelectorAll('.link-host-panel')].map(p => [p.id, true]))
+    ));
+  } catch(_) {}
 }
 
 function expandAll() {
@@ -520,7 +524,7 @@ function expandAll() {
     if (btn)   btn.textContent = '[–]';
     if (title) title.setAttribute('aria-expanded', 'true');
   });
-  sessionStorage.setItem('linksCollapsed', '{}');
+  try { sessionStorage.setItem('linksCollapsed', '{}'); } catch(_) {}
 }
 
 // ── Stale data warning ────────────────────────────────────────────