Fix project deletion 500 error, select dropdown option styling, 3-level watchdog hierarchy traversal, and filter out heartbeat workers as parent candidates

public/index.php

@@ -111,12 +111,10 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         if ($name) {
             try {
                 if ($id > 0) {
-                    // Update: Slug is immutable!
                     $stmt = $pdo->prepare('UPDATE dc_projects SET name = :n, default_cache_ttl_hours = :t, notes = :notes WHERE id = :id');
                     $stmt->execute([':n' => $name, ':t' => $ttl, ':notes' => $notes, ':id' => $id]);
                     $msg = "Projekt '{$name}' wurde aktualisiert.";
                 } else {
-                    // New Project
                     if ($slug) {
                         $stmt = $pdo->prepare('INSERT INTO dc_projects (slug, name, default_cache_ttl_hours, notes) VALUES (:s, :n, :t, :notes)');
                         $stmt->execute([':s' => $slug, ':n' => $name, ':t' => $ttl, ':notes' => $notes]);
@@ -130,22 +128,47 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         }
     }
 
-    // Delete Project (with Safety Confirmation)
+    // Delete Project (Clean transaction cascade to avoid 500 errors)
     if ($action === 'delete_project') {
         $id = (int)($_POST['project_id'] ?? 0);
         $confirmSlug = trim($_POST['confirm_slug'] ?? '');
 
         if ($id > 0) {
-            $stmt = $pdo->prepare('SELECT slug, name FROM dc_projects WHERE id = :id');
+            try {
-            $stmt->execute([':id' => $id]);
+                $stmt = $pdo->prepare('SELECT slug, name FROM dc_projects WHERE id = :id');
-            $proj = $stmt->fetch();
+                $stmt->execute([':id' => $id]);
+                $proj = $stmt->fetch();
 
-            if ($proj && hash_equals($proj['slug'], $confirmSlug)) {
+                if ($proj && hash_equals($proj['slug'], $confirmSlug)) {
-                $delStmt = $pdo->prepare('DELETE FROM dc_projects WHERE id = :id');
+                    $pdo->beginTransaction();
-                $delStmt->execute([':id' => $id]);
+
-                $msg = "Projekt '{$proj['name']}' ({$proj['slug']}) wurde unwiderruflich gelöscht.";
+                    // 1. Delete associated activations
-            } else {
+                    $pdo->prepare('DELETE a FROM license_activations a JOIN license_licenses l ON a.license_id = l.id WHERE l.product_id = :id')
-                $msg = "Sicherheitsbestätigung fehlgeschlagen! Der eingegebene Slug stimmte nicht überein.";
+                        ->execute([':id' => $id]);
+
+                    // 2. Delete associated licenses
+                    $pdo->prepare('DELETE FROM license_licenses WHERE product_id = :id')
+                        ->execute([':id' => $id]);
+
+                    // 3. Delete associated releases
+                    $pdo->prepare('DELETE FROM updateservice_releases WHERE product_slug = :slug')
+                        ->execute([':slug' => $proj['slug']]);
+
+                    // 4. Delete project
+                    $delStmt = $pdo->prepare('DELETE FROM dc_projects WHERE id = :id');
+                    $delStmt->execute([':id' => $id]);
+
+                    $pdo->commit();
+                    $msg = "Projekt '{$proj['name']}' ({$proj['slug']}) und zugehörige Daten wurden gelöscht.";
+                } else {
+                    $msg = "Sicherheitsbestätigung fehlgeschlagen! Der eingegebene Slug stimmte nicht überein.";
+                    $msgType = 'danger';
+                }
+            } catch (Throwable $e) {
+                if ($pdo->inTransaction()) {
+                    $pdo->rollBack();
+                }
+                $msg = "Fehler beim Löschen des Projekts: " . $e->getMessage();
                 $msgType = 'danger';
             }
         }
@@ -369,41 +392,47 @@ $auditLogs = $pdo->query('SELECT * FROM license_audit_log ORDER BY created_at DE
 $monitorRepo = new MonitorRepo($pdo);
 $monitors = $monitorRepo->getAllMonitors();
 
-// Flatten Tree for Hierarchy Rendering
+// Flatten Tree for Hierarchy Rendering (Up to 3 levels: Hypervisor -> Host -> App)
 function buildMonitorTree(array $monitors): array {
-    $bySource = [];
+    $childrenOf = [];
+    $bySource   = [];
+
     foreach ($monitors as $m) {
         $bySource[$m['source']] = $m;
-        $bySource[$m['source']]['children'] = [];
+        $parent = !empty($m['parent_source']) ? $m['parent_source'] : '__ROOT__';
+        $childrenOf[$parent][] = $m['source'];
     }
 
-    $tree = [];
-    foreach ($bySource as $source => &$m) {
-        $parent = $m['parent_source'] ?? null;
-        if (!empty($parent) && isset($bySource[$parent])) {
-            $bySource[$parent]['children'][] = &$m;
-        } else {
-            $tree[] = &$m;
-        }
-    }
-    unset($m);
-
     $flat = [];
-    $walk = function(array $nodes, int $depth = 0) use (&$walk, &$flat) {
+    $walk = function(string $parentSource, int $depth = 0) use (&$walk, &$flat, $childrenOf, $bySource) {
+        if ($depth > 3) return;
+        if (empty($childrenOf[$parentSource])) return;
+
+        $nodes = $childrenOf[$parentSource];
         $count = count($nodes);
         for ($i = 0; $i < $count; $i++) {
-            $node = $nodes[$i];
+            $src = $nodes[$i];
+            if (!isset($bySource[$src])) continue;
+            $node = $bySource[$src];
             $node['depth'] = $depth;
             $node['is_last'] = ($i === $count - 1);
-            $children = $node['children'] ?? [];
-            unset($node['children']);
             $flat[] = $node;
-            if (!empty($children)) {
+
-                $walk($children, $depth + 1);
+            $walk($src, $depth + 1);
-            }
         }
     };
-    $walk($tree, 0);
+
+    $walk('__ROOT__', 0);
+
+    // Append any unvisited monitors as root level
+    $visited = array_column($flat, 'source');
+    foreach ($monitors as $m) {
+        if (!in_array($m['source'], $visited, true)) {
+            $m['depth'] = 0;
+            $m['is_last'] = true;
+            $flat[] = $m;
+        }
+    }
 
     return $flat;
 }
@@ -550,6 +579,12 @@ $baseUrl = $protocol . '://' . $host;
         .form-input { background: rgba(255,255,255,0.04); border: 1px solid var(--border-glass); border-radius: 10px; padding: 0.65rem 0.85rem; color: #fff; font-size: 0.875rem; outline: none; font-family: 'Manrope', system-ui; transition: border-color 0.2s; }
         .form-input:focus { border-color: var(--primary); }
 
+        /* Dropdown Option List Styling Fix (Readable text across all browsers) */
+        select.form-input option {
+            background-color: #0e121c;
+            color: #EDEFF5;
+        }
+
         .prompt-box { background: rgba(0,0,0,0.5); border: 1px solid var(--border-glass); border-radius: 10px; padding: 1.1rem; font-family: 'Roboto Mono', monospace; font-size: 0.825rem; color: #cbd5e1; white-space: pre-wrap; word-break: break-all; margin-bottom: 0.75rem; position: relative; max-height: 380px; overflow-y: auto; }
 
         .alert { padding: 1rem 1.25rem; border-radius: 12px; margin-bottom: 1.5rem; font-size: 0.875rem; font-weight: 600; }
@@ -1124,10 +1159,10 @@ $baseUrl = $protocol . '://' . $host;
                     </div>
                 </div>
 
-                <!-- Subtab: Watchdog Hierarchie & Tree View -->
+                <!-- Subtab: Watchdog Hierarchie & Tree View (3 Ebenen Support) -->
                 <div id="sub-watchdog-hierarchy" class="subtab-content">
                     <div class="card">
-                        <div class="card-header"><h2 class="card-title">🌳 Proxmox & Host System-Hierarchie</h2></div>
+                        <div class="card-header"><h2 class="card-title">🌳 Proxmox, Host & Worker System-Hierarchie (3 Ebenen)</h2></div>
                         <table>
                             <thead>
                                 <tr>
@@ -1135,7 +1170,7 @@ $baseUrl = $protocol . '://' . $host;
                                     <th>Typ</th>
                                     <th>Parent Entity</th>
                                     <th>Status</th>
-                                    <th>Verknüpfen (Parent)</th>
+                                    <th>Parent Verknüpfen</th>
                                 </tr>
                             </thead>
                             <tbody>
@@ -1164,9 +1199,10 @@ $baseUrl = $protocol . '://' . $host;
                                                 <select name="parent_source" class="form-input" style="padding:0.25rem 0.5rem; font-size:0.75rem;" onchange="this.form.submit()">
                                                     <option value="">-- Keine (Top Level) --</option>
                                                     <?php foreach ($monitors as $pCandidate): ?>
-                                                        <?php if ($pCandidate['source'] !== $m['source']): ?>
+                                                        <!-- Dienst/Worker (heartbeat) kann NIEMALS Parent sein! -->
+                                                        <?php if ($pCandidate['source'] !== $m['source'] && $pCandidate['type'] !== 'heartbeat'): ?>
                                                             <option value="<?= htmlspecialchars($pCandidate['source']) ?>" <?= $m['parent_source'] === $pCandidate['source'] ? 'selected' : '' ?>>
-                                                                <?= htmlspecialchars($pCandidate['source']) ?>
+                                                                <?= htmlspecialchars($pCandidate['source']) ?> (<?= htmlspecialchars($pCandidate['type']) ?>)
                                                             </option>
                                                         <?php endif; ?>
                                                     <?php endforeach; ?>
@@ -1205,7 +1241,9 @@ $baseUrl = $protocol . '://' . $host;
                                     <select name="parent_source" class="form-input">
                                         <option value="">-- Keine (Top Level) --</option>
                                         <?php foreach ($monitors as $pm): ?>
-                                            <option value="<?= htmlspecialchars($pm['source']) ?>"><?= htmlspecialchars($pm['source']) ?></option>
+                                            <?php if ($pm['type'] !== 'heartbeat'): ?>
+                                                <option value="<?= htmlspecialchars($pm['source']) ?>"><?= htmlspecialchars($pm['source']) ?> (<?= htmlspecialchars($pm['type']) ?>)</option>
+                                            <?php endif; ?>
                                         <?php endforeach; ?>
                                     </select>
                                 </div>
@@ -1519,7 +1557,7 @@ $baseUrl = $protocol . '://' . $host;
             ],
             'watchdog': [
                 { id: 'sub-watchdog-dashboard', label: '📊 Dashboard', active: true },
-                { id: 'sub-watchdog-hierarchy', label: '🌳 System-Hierarchie' },
+                { id: 'sub-watchdog-hierarchy', label: '🌳 System-Hierarchie (3 Ebenen)' },
                 { id: 'sub-watchdog-add', label: '➕ Monitor Hinzufügen' },
                 { id: 'sub-watchdog-uptime', label: '⏱️ Uptime & CRUD' },
                 { id: 'sub-watchdog-eventlog', label: '📜 Event-Log' },