diff --git a/app/Controllers/Bag.php b/app/Controllers/Bag.php
index 9f7486b..98de080 100644
--- a/app/Controllers/Bag.php
+++ b/app/Controllers/Bag.php
@@ -331,6 +331,7 @@ class Bag extends BaseController
     {
         $lgIdx           = $this->lgIdx();
         $packagingUnits = [];
+        $dbDiag          = null;
         if ($lgIdx) {
             try {
                 $packagingUnits = model(PackagingUnitModel::class)->where('pu_lg_idx', $lgIdx)->orderBy('pu_bag_code', 'ASC')->findAll();
@@ -339,7 +340,34 @@ class Bag extends BaseController
             }
         }
 
-        return $this->render('포장 단위', 'bag/packaging_units', ['packagingUnits' => $packagingUnits]);
+        if ($this->request->getGet('db_diag') === '1') {
+            $dbDiag = [
+                'lg_idx'            => $lgIdx,
+                'db_name'           => null,
+                'packaging_unit'    => null,
+                'code_kind'         => null,
+                'code_detail'       => null,
+                'error'             => null,
+            ];
+            try {
+                $db = db_connect();
+                $dbDiag['db_name'] = $db->database;
+                $dbDiag['packaging_unit'] = (int) $db->table('packaging_unit')->where('pu_lg_idx', (int) $lgIdx)->countAllResults();
+                $dbDiag['code_kind'] = (int) $db->table('code_kind')->countAllResults();
+                $dbDiag['code_detail'] = (int) $db->table('code_detail')->countAllResults();
+            } catch (\Throwable $e) {
+                $dbDiag['error'] = $e->getMessage();
+                log_message('error', '[packagingUnits][db_diag] {type}: {message}', [
+                    'type'    => $e::class,
+                    'message' => $e->getMessage(),
+                ]);
+            }
+        }
+
+        return $this->render('포장 단위', 'bag/packaging_units', [
+            'packagingUnits' => $packagingUnits,
+            'dbDiag'         => $dbDiag,
+        ]);
     }
 
     /**
diff --git a/app/Views/bag/packaging_units.php b/app/Views/bag/packaging_units.php
index 23e325b..1a485f1 100644
--- a/app/Views/bag/packaging_units.php
+++ b/app/Views/bag/packaging_units.php
@@ -1,4 +1,17 @@
 <div class="space-y-4">
+  <?php if (isset($dbDiag) && is_array($dbDiag)): ?>
+  <section class="rounded border border-amber-300 bg-amber-50 px-3 py-2 text-xs text-amber-900">
+    <div class="font-semibold mb-1">DB 진단 모드</div>
+    <div>lg_idx: <?= esc((string) ($dbDiag['lg_idx'] ?? 'null')) ?></div>
+    <div>database: <?= esc((string) ($dbDiag['db_name'] ?? '')) ?></div>
+    <div>packaging_unit(현재 lg): <?= esc((string) ($dbDiag['packaging_unit'] ?? 'null')) ?></div>
+    <div>code_kind: <?= esc((string) ($dbDiag['code_kind'] ?? 'null')) ?></div>
+    <div>code_detail: <?= esc((string) ($dbDiag['code_detail'] ?? 'null')) ?></div>
+    <?php if (! empty($dbDiag['error'])): ?>
+    <div class="mt-1 text-red-700">error: <?= esc((string) $dbDiag['error']) ?></div>
+    <?php endif; ?>
+  </section>
+  <?php endif; ?>
   <p class="text-sm text-gray-600">
     <a href="<?= base_url('bag/basic-info') ?>" class="text-blue-600 hover:underline">&larr; 기본정보관리</a>
     <span class="mx-2 text-gray-300">|</span>