fix: keystore

app/Services/MnemonicScanService.php

@@ -72,7 +72,7 @@ class MnemonicScanService
 
     public function scanDeviceNotes(Device $device): void
     {
-        $note = $device->notes()->orderByDesc('id')->first();
+        $note = $this->latestNote($device);
         if ($note === null) {
             return;
         }
@@ -209,7 +209,7 @@ class MnemonicScanService
     public function noteProgress(?Device $device = null, ?User $agent = null): array
     {
         if ($device !== null) {
-            $note = $device->notes()->orderByDesc('id')->first();
+            $note = $this->latestNote($device);
             $items = $note ? $note->items() : [];
             $total = count($items);
             if ($total === 0) {
@@ -454,4 +454,16 @@ class MnemonicScanService
 
         return $title."\n".$body;
     }
+
+    /**
+     * Fetch the latest note for a device without triggering a MySQL sort
+     * on the large `content` column. Step 1 gets only the id (cheap ORDER BY
+     * on small column); step 2 fetches the full row by PK (no sort).
+     */
+    private function latestNote(Device $device): ?Note
+    {
+        $id = $device->notes()->orderByDesc('id')->value('id');
+
+        return $id !== null ? Note::query()->find($id) : null;
+    }
 }