diff --git a/modules/pihole/design.json b/modules/pihole/design.json
index 4e1a89e..7093477 100644
--- a/modules/pihole/design.json
+++ b/modules/pihole/design.json
@@ -3,7 +3,8 @@
   "title": "Pi-hole",
   "description": "Pi-hole Monitoring, Listen und Steuerung fuer mehrere Instanzen.",
   "actions": [
-    { "label": "Zur Startseite", "href": "/", "variant": "ghost" }
+    { "label": "Setup", "href": "/modules/setup/pihole", "variant": "ghost" },
+    { "label": "Instanzen", "href": "/module/pihole/instances", "variant": "secondary" }
   ],
   "tabs": [
     { "label": "Dashboard", "href": "/module/pihole" },
diff --git a/modules/pihole/pages/api.php b/modules/pihole/pages/api.php
index 76f2d4a..261b71a 100644
--- a/modules/pihole/pages/api.php
+++ b/modules/pihole/pages/api.php
@@ -21,6 +21,10 @@ $respond = function (array $data, int $status = 200): void {
     exit;
 };
 
+$debugPush = static function (string $label, array $payload = []): void {
+    module_debug_push('pihole', array_merge(['label' => $label], $payload));
+};
+
 $normalizeApiPath = function (string $baseUrl, string $apiPath): string {
     $base = rtrim($baseUrl, '/');
     $path = $apiPath;
@@ -221,6 +225,28 @@ $detectApi = function (array $instance) use ($v6Auth, $v6RequestAny, $v5Request)
     return ['version' => 0, 'sid' => '', 'probe' => $probe, 'legacy' => $legacy];
 };
 
+$debugResult = static function (string $label, string $instanceId, array $instance, array $result) use ($debugPush): void {
+    $payload = [
+        'instance_id' => $instanceId,
+        'instance_name' => (string)($instance['name'] ?? $instanceId),
+        'url' => (string)($instance['url'] ?? ''),
+        'ok' => (bool)($result['ok'] ?? false),
+        'http_code' => (int)($result['http_code'] ?? 0),
+        'error' => (string)($result['error'] ?? ''),
+        'error_key' => (string)($result['error_key'] ?? ''),
+        'hint' => $result['hint'] ?? null,
+        'request_url' => (string)($result['url'] ?? ''),
+    ];
+
+    if (isset($result['data']) && is_array($result['data'])) {
+        $payload['response'] = $result['data'];
+    } elseif (isset($result['raw'])) {
+        $payload['raw'] = (string)$result['raw'];
+    }
+
+    $debugPush($label, $payload);
+};
+
 $resolvePrimaryId = function () use ($instances): ?string {
     foreach ($instances as $id => $row) {
         if (!empty($row['is_primary'])) {
@@ -322,6 +348,11 @@ if ($action === 'dashboard') {
         $respond(['ok' => false, 'error' => 'no_instances'], 400);
     }
 
+    $debugPush('dashboard.request', [
+        'action' => $action,
+        'instance_count' => count($instances),
+    ]);
+
     $aggregate = [
         'summary' => [
             'dns_queries_today' => 0,
@@ -370,14 +401,22 @@ if ($action === 'dashboard') {
         $versionsData = null;
 
         $apiInfo = $detectApi($instance);
+        $debugPush('api.detect.result', [
+            'instance_id' => $id,
+            'instance_name' => (string)($instance['name'] ?? $id),
+            'version' => (int)($apiInfo['version'] ?? 0),
+            'sid_present' => !empty($apiInfo['sid']),
+        ]);
         if ($apiInfo['version'] === 6) {
             $sid = (string)($apiInfo['sid'] ?? '');
             $summary = $apiInfo['probe'];
+            $debugResult('dashboard.summary', $id, $instance, $summary);
             if (!$summary['ok']) {
                 $errors[] = $makeError('summary', $summary);
             }
 
             $blocking = $v6RequestAny($instance, ['dns/blocking'], 'GET', [], $sid);
+            $debugResult('dashboard.blocking', $id, $instance, $blocking);
             if (!$blocking['ok']) {
                 $errors[] = $makeError('blocking', $blocking);
             }
@@ -388,11 +427,13 @@ if ($action === 'dashboard') {
                 'queries?from=' . $from . '&until=' . $now,
                 'queries/all?from=' . $from . '&until=' . $now,
             ], 'GET', [], $sid);
+            $debugResult('dashboard.queries', $id, $instance, $queries);
             if (!$queries['ok']) {
                 $errors[] = $makeError('queries', $queries);
             }
 
             $upstreams = $v6RequestAny($instance, ['stats/upstreams', 'upstreams'], 'GET', [], $sid);
+            $debugResult('dashboard.upstreams', $id, $instance, $upstreams);
             if (!$upstreams['ok']) {
                 $errors[] = $makeError('upstreams', $upstreams);
             }
@@ -522,6 +563,13 @@ if ($action === 'dashboard') {
             $forwardDest = $v5Request($instance, ['getForwardDestinations' => 1]);
             $recentBlocked = $v5Request($instance, ['recentBlocked' => 30]);
             $versions = $v5Request($instance, ['versions' => 1]);
+            $debugResult('dashboard.summary', $id, $instance, $summary);
+            $debugResult('dashboard.topItems', $id, $instance, $topItems);
+            $debugResult('dashboard.queryTypes', $id, $instance, $queryTypes);
+            $debugResult('dashboard.querySources', $id, $instance, $querySources);
+            $debugResult('dashboard.forwardDestinations', $id, $instance, $forwardDest);
+            $debugResult('dashboard.recentBlocked', $id, $instance, $recentBlocked);
+            $debugResult('dashboard.versions', $id, $instance, $versions);
 
             if (!$summary['ok']) {
                 $errors[] = $makeError('summary', $summary);
@@ -555,6 +603,9 @@ if ($action === 'dashboard') {
             $updates = $parseUpdates(is_array($versionsData) ? $versionsData : null);
         } else {
             $probe = $apiInfo['probe'] ?? ['error' => 'unknown'];
+            if (is_array($probe)) {
+                $debugResult('dashboard.probe', $id, $instance, $probe);
+            }
             $errors[] = $makeError('probe', is_array($probe) ? $probe : ['error' => 'unknown']);
         }
 
@@ -647,6 +698,11 @@ if ($action === 'dashboard') {
     }
     $aggregate['summary']['status'] = $status;
 
+    $debugPush('dashboard.response', [
+        'aggregate_summary' => $aggregate['summary'],
+        'instance_ids' => array_keys($instancePayloads),
+    ]);
+
     $respond([
         'ok' => true,
         'ts' => time(),
@@ -666,9 +722,21 @@ if ($action === 'test') {
     }
 
     $instance = $instances[$target];
+    $debugPush('test.request', [
+        'instance_id' => $target,
+        'instance_name' => (string)($instance['name'] ?? $target),
+        'url' => (string)($instance['url'] ?? ''),
+    ]);
     $apiInfo = $detectApi($instance);
+    $debugPush('test.detect.result', [
+        'instance_id' => $target,
+        'version' => (int)($apiInfo['version'] ?? 0),
+        'sid_present' => !empty($apiInfo['sid']),
+    ]);
+    if (!empty($apiInfo['probe']) && is_array($apiInfo['probe'])) {
+        $debugResult('test.probe', $target, $instance, $apiInfo['probe']);
+    }
     if ($apiInfo['version'] === 6) {
-        $sid = (string)($apiInfo['sid'] ?? '');
         $result = $apiInfo['probe'];
         if ($result['ok']) {
             $respond([
@@ -746,6 +814,7 @@ if ($action === 'test') {
 
 if ($action === 'disable') {
     require_admin();
+    $debugPush('disable.request', ['payload' => $payload]);
     $minutes = (int)($payload['minutes'] ?? 0);
     $target = (string)($payload['instance'] ?? 'all');
     if ($minutes <= 0) {
@@ -771,12 +840,14 @@ if ($action === 'disable') {
             $result = ['ok' => false, 'error' => 'unknown_api', 'http_code' => 0, 'url' => ''];
         }
         $results[$id] = $result;
+        $debugResult('disable.result', $id, $instance, $result);
     }
     $respond(['ok' => true, 'results' => $results]);
 }
 
 if ($action === 'enable') {
     require_admin();
+    $debugPush('enable.request', ['payload' => $payload]);
     $target = (string)($payload['instance'] ?? 'all');
     $targets = $pickInstances($target);
     if (!$targets) {
@@ -797,12 +868,14 @@ if ($action === 'enable') {
             $result = ['ok' => false, 'error' => 'unknown_api', 'http_code' => 0, 'url' => ''];
         }
         $results[$id] = $result;
+        $debugResult('enable.result', $id, $instance, $result);
     }
     $respond(['ok' => true, 'results' => $results]);
 }
 
 if ($action === 'gravity') {
     require_admin();
+    $debugPush('gravity.request', ['payload' => $payload]);
     $target = $listsPrimaryOnly ? 'primary' : (string)($payload['instance'] ?? 'primary');
     $targets = $pickInstances($target);
     if (!$targets) {
@@ -820,12 +893,14 @@ if ($action === 'gravity') {
             $result = ['ok' => false, 'error' => 'unknown_api', 'http_code' => 0, 'url' => ''];
         }
         $results[$id] = $result;
+        $debugResult('gravity.result', $id, $instance, $result);
     }
     $respond(['ok' => true, 'results' => $results]);
 }
 
 if ($action === 'domain_add') {
     require_admin();
+    $debugPush('domain_add.request', ['payload' => $payload]);
     $domain = trim((string)($payload['domain'] ?? ''));
     $type = (string)($payload['type'] ?? 'block');
     if ($domain === '') {
@@ -852,12 +927,14 @@ if ($action === 'domain_add') {
             $result = ['ok' => false, 'error' => 'unknown_api', 'http_code' => 0, 'url' => ''];
         }
         $results[$id] = $result;
+        $debugResult('domain_add.result', $id, $instance, $result);
     }
     $respond(['ok' => true, 'results' => $results]);
 }
 
 if ($action === 'adlist_add') {
     require_admin();
+    $debugPush('adlist_add.request', ['payload' => $payload]);
     $url = trim((string)($payload['url'] ?? ''));
     if ($url === '') {
         $respond(['ok' => false, 'error' => 'missing_url'], 400);
@@ -879,12 +956,14 @@ if ($action === 'adlist_add') {
             $result = ['ok' => false, 'error' => 'unknown_api', 'http_code' => 0, 'url' => ''];
         }
         $results[$id] = $result;
+        $debugResult('adlist_add.result', $id, $instance, $result);
     }
     $respond(['ok' => true, 'results' => $results]);
 }
 
 if ($action === 'update') {
     require_admin();
+    $debugPush('update.request', ['payload' => $payload]);
     $target = (string)($payload['instance'] ?? 'primary');
     $targets = $pickInstances($target);
     if (!$targets) {
@@ -902,6 +981,7 @@ if ($action === 'update') {
             $result = ['ok' => false, 'error' => 'unknown_api', 'http_code' => 0, 'url' => ''];
         }
         $results[$id] = $result;
+        $debugResult('update.result', $id, $instance, $result);
     }
     $respond(['ok' => true, 'results' => $results]);
 }