diff --git a/drb-c2-core/app/routers/calls.py b/drb-c2-core/app/routers/calls.py
index 76527d6..9e5ab39 100644
--- a/drb-c2-core/app/routers/calls.py
+++ b/drb-c2-core/app/routers/calls.py
@@ -78,10 +78,13 @@ async def close_stale_calls(
         started_raw = call.get("started_at")
         if not started_raw:
             continue
-        try:
-            started = datetime.fromisoformat(started_raw.replace("Z", "+00:00"))
-        except Exception:
-            continue
+        if isinstance(started_raw, datetime):
+            started = started_raw if started_raw.tzinfo else started_raw.replace(tzinfo=timezone.utc)
+        else:
+            try:
+                started = datetime.fromisoformat(str(started_raw).replace("Z", "+00:00"))
+            except Exception:
+                continue
         if started < cutoff:
             stale.append(call)
 
diff --git a/drb-frontend/app/admin/page.tsx b/drb-frontend/app/admin/page.tsx
index 5dc13c1..41464bc 100644
--- a/drb-frontend/app/admin/page.tsx
+++ b/drb-frontend/app/admin/page.tsx
@@ -961,15 +961,102 @@ function AuditLogTab() {
   );
 }
 
+// ---------------------------------------------------------------------------
+// Stale Calls tab
+// ---------------------------------------------------------------------------
+
+function StaleCallsTab() {
+  const [minutes, setMinutes]   = useState(30);
+  const [result, setResult]     = useState<{ dry_run: boolean; count: number; call_ids: string[] } | null>(null);
+  const [loading, setLoading]   = useState(false);
+  const [error, setError]       = useState<string | null>(null);
+
+  async function run(dryRun: boolean) {
+    setLoading(true);
+    setError(null);
+    setResult(null);
+    try {
+      const res = await c2api.closeStallCalls(minutes, dryRun);
+      setResult(res);
+    } catch (e) {
+      setError(String(e));
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  return (
+    <div className="space-y-5">
+      <p className="text-xs text-gray-500 font-mono">
+        Finds calls stuck in <span className="text-gray-300">active</span> status because a node rebooted before sending an end-call event.
+        Preview first, then close.
+      </p>
+
+      <div className="flex flex-wrap items-end gap-4">
+        <div>
+          <label className="text-xs text-gray-400 block mb-1">Older than (minutes)</label>
+          <input
+            type="number"
+            min={1} max={1440}
+            value={minutes}
+            onChange={(e) => setMinutes(Math.min(1440, Math.max(1, Number(e.target.value))))}
+            className="w-28 bg-gray-800 border border-gray-700 rounded-lg px-3 py-1.5 text-white text-sm font-mono focus:outline-none focus:border-indigo-500"
+          />
+        </div>
+        <button
+          onClick={() => run(true)}
+          disabled={loading}
+          className="bg-gray-800 hover:bg-gray-700 disabled:opacity-50 border border-gray-700 text-white text-sm font-mono px-4 py-1.5 rounded-lg transition-colors"
+        >
+          {loading ? "Working…" : "Preview"}
+        </button>
+        <button
+          onClick={() => run(false)}
+          disabled={loading || result === null || result.count === 0}
+          className="bg-red-700 hover:bg-red-600 disabled:opacity-50 text-white text-sm font-mono px-4 py-1.5 rounded-lg transition-colors"
+        >
+          {result && !result.dry_run ? "Closed" : result?.count ? `Close ${result.count} calls` : "Close calls"}
+        </button>
+      </div>
+
+      {error && (
+        <div className="bg-red-950 border border-red-800 rounded-lg p-3">
+          <p className="text-red-400 text-sm font-mono">{error}</p>
+        </div>
+      )}
+
+      {result && (
+        <div className="bg-gray-900 border border-gray-800 rounded-xl p-4 space-y-2">
+          <p className="text-sm font-mono text-white">
+            {result.dry_run ? "Preview: " : "Closed: "}
+            <span className={result.count > 0 ? "text-amber-400" : "text-green-400"}>
+              {result.count} stale call{result.count !== 1 ? "s" : ""}
+            </span>
+            {result.count === 0 && <span className="text-gray-500"> — nothing to clear</span>}
+          </p>
+          {result.call_ids.length > 0 && (
+            <div className="max-h-40 overflow-y-auto space-y-0.5">
+              {result.call_ids.map((id) => (
+                <p key={id} className="text-xs font-mono text-gray-400">{id}</p>
+              ))}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
 // ---------------------------------------------------------------------------
 // Main admin page
 // ---------------------------------------------------------------------------
 
-type AdminTab = "features" | "correlation" | "users" | "audit";
+type AdminTab = "features" | "correlation" | "users" | "audit" | "calls";
 
 const TAB_LABELS: { key: AdminTab; label: string }[] = [
   { key: "features",    label: "AI Features" },
   { key: "correlation", label: "Correlation Debug" },
+  { key: "calls",       label: "Calls" },
   { key: "users",       label: "Users" },
   { key: "audit",       label: "Audit Log" },
 ];
@@ -985,7 +1072,7 @@ export default function AdminPage() {
 
   if (!isAdmin) return null;
 
-  // Users/Audit tabs benefit from full width; AI Features / Correlation are narrow
+  // Users/Audit tabs benefit from full width; everything else is narrow
   const wide = tab === "users" || tab === "audit";
 
   return (
@@ -1008,6 +1095,7 @@ export default function AdminPage() {
 
       {tab === "features"    && <FeaturesTab />}
       {tab === "correlation" && <CorrelationDebugTab />}
+      {tab === "calls"       && <StaleCallsTab />}
       {tab === "users"       && <UsersTab currentUid={user?.uid ?? ""} />}
       {tab === "audit"       && <AuditLogTab />}
     </div>