diff --git a/TODO.md b/TODO.md
index a10a77f..fdbfaa5 100644
--- a/TODO.md
+++ b/TODO.md
@@ -234,3 +234,4 @@ Hinweis: Die Eintraege sind direkt aus den Quelldateien aggregiert.
 - [ ] L241: ### TODO: Patchpanel-Infrastruktur
 - [ ] L253: - TODO: SVG-Editor um Drag & Drop für diese Objekte erweitern und Klicks direkt mit dem Modul verbinden.
 
+- [ ] //TODO infrastruktur patchfelder löschen soll implementiert werden.
\ No newline at end of file
diff --git a/app/modules/dashboard/list.php b/app/modules/dashboard/list.php
index 9a1770a..593036f 100644
--- a/app/modules/dashboard/list.php
+++ b/app/modules/dashboard/list.php
@@ -8,6 +8,8 @@
 // Statistiken aus DB laden
 // =========================
 
+//TODO eine große zoombare verschiebbare svg wand machen, mit allen punkten drauf. anklicken der punkte erzeugt ein overlay, mit der reingezoomten ansicht zb einem rack
+
 $stats = [
     'devices' => $sql->single("SELECT COUNT(*) as cnt FROM devices", "", [])['cnt'] ?? 0,
     'device_types' => $sql->single("SELECT COUNT(*) as cnt FROM device_types", "", [])['cnt'] ?? 0,
diff --git a/app/modules/devices/delete.php b/app/modules/devices/delete.php
index c5b8b0b..12992be 100644
--- a/app/modules/devices/delete.php
+++ b/app/modules/devices/delete.php
@@ -2,13 +2,14 @@
 /**
  * app/modules/devices/delete.php
  *
- * Löscht ein Gerät inkl. abhängiger Verbindungen.
+ * Loescht ein Geraet. Bei Abhaengigkeiten ist force=1 erforderlich.
  */
 
 $deviceId = (int)($_GET['id'] ?? 0);
+$forceDelete = (int)($_GET['force'] ?? 0) === 1;
 
 if ($deviceId <= 0) {
-    $_SESSION['error'] = "Ungültige Geräte-ID";
+    $_SESSION['error'] = "Ungueltige Geraete-ID";
     header('Location: ?module=devices&action=list');
     exit;
 }
@@ -20,12 +21,61 @@ $device = $sql->single(
 );
 
 if (!$device) {
-    $_SESSION['error'] = "Gerät nicht gefunden";
+    $_SESSION['error'] = "Geraet nicht gefunden";
     header('Location: ?module=devices&action=list');
     exit;
 }
 
-// Verbindungen auf Ports dieses Geräts entfernen (keine FK auf device_ports in connections).
+$dependencies = $sql->single(
+    "SELECT
+        (
+            SELECT COUNT(*)
+            FROM device_ports dp
+            WHERE dp.device_id = ?
+        ) AS port_count,
+        (
+            SELECT COUNT(*)
+            FROM device_port_modules dpm
+            JOIN device_ports dp2 ON dp2.id = dpm.device_port_id
+            WHERE dp2.device_id = ?
+        ) AS module_count,
+        (
+            SELECT COUNT(*)
+            FROM connections c
+            WHERE (c.port_a_type = 'device' AND c.port_a_id IN (
+                    SELECT dp3.id FROM device_ports dp3 WHERE dp3.device_id = ?
+                  ))
+               OR (c.port_b_type = 'device' AND c.port_b_id IN (
+                    SELECT dp4.id FROM device_ports dp4 WHERE dp4.device_id = ?
+                  ))
+        ) AS connection_count",
+    "iiii",
+    [$deviceId, $deviceId, $deviceId, $deviceId]
+);
+
+$portCount = (int)($dependencies['port_count'] ?? 0);
+$moduleCount = (int)($dependencies['module_count'] ?? 0);
+$connectionCount = (int)($dependencies['connection_count'] ?? 0);
+$hasDependencies = $portCount > 0 || $moduleCount > 0 || $connectionCount > 0;
+
+if ($hasDependencies && !$forceDelete) {
+    $parts = [];
+    if ($connectionCount > 0) {
+        $parts[] = $connectionCount . ' Verbindungen';
+    }
+    if ($portCount > 0) {
+        $parts[] = $portCount . ' Ports';
+    }
+    if ($moduleCount > 0) {
+        $parts[] = $moduleCount . ' Port-Module';
+    }
+
+    $_SESSION['error'] = "Geraet hat abhaengige Daten (" . implode(', ', $parts) . "). Loeschen bitte bestaetigen.";
+    header('Location: ?module=devices&action=edit&id=' . urlencode((string)$deviceId));
+    exit;
+}
+
+// Connections referenzieren device_ports nur logisch, daher manuell entfernen.
 $sql->set(
     "DELETE FROM connections
      WHERE (port_a_type = 'device' AND port_a_id IN (SELECT id FROM device_ports WHERE device_id = ?))
@@ -41,9 +91,9 @@ $deleted = $sql->set(
 );
 
 if ($deleted > 0) {
-    $_SESSION['success'] = "Gerät gelöscht: " . $device['name'];
+    $_SESSION['success'] = "Geraet geloescht: " . $device['name'];
 } else {
-    $_SESSION['error'] = "Gerät konnte nicht gelöscht werden";
+    $_SESSION['error'] = "Geraet konnte nicht geloescht werden";
 }
 
 header('Location: ?module=devices&action=list');
diff --git a/app/modules/devices/edit.php b/app/modules/devices/edit.php
index e903f88..8881776 100644
--- a/app/modules/devices/edit.php
+++ b/app/modules/devices/edit.php
@@ -24,6 +24,40 @@ if ($deviceId > 0) {
 
 $isEdit = !empty($device);
 $pageTitle = $isEdit ? "Gerät bearbeiten: " . htmlspecialchars($device['name']) : "Neues Gerät";
+$dependencyCounts = [
+    'port_count' => 0,
+    'module_count' => 0,
+    'connection_count' => 0
+];
+
+if ($isEdit) {
+    $dependencyCounts = $sql->single(
+        "SELECT
+            (
+                SELECT COUNT(*)
+                FROM device_ports dp
+                WHERE dp.device_id = ?
+            ) AS port_count,
+            (
+                SELECT COUNT(*)
+                FROM device_port_modules dpm
+                JOIN device_ports dp2 ON dp2.id = dpm.device_port_id
+                WHERE dp2.device_id = ?
+            ) AS module_count,
+            (
+                SELECT COUNT(*)
+                FROM connections c
+                WHERE (c.port_a_type = 'device' AND c.port_a_id IN (
+                        SELECT dp3.id FROM device_ports dp3 WHERE dp3.device_id = ?
+                      ))
+                   OR (c.port_b_type = 'device' AND c.port_b_id IN (
+                        SELECT dp4.id FROM device_ports dp4 WHERE dp4.device_id = ?
+                      ))
+            ) AS connection_count",
+        "iiii",
+        [$deviceId, $deviceId, $deviceId, $deviceId]
+    ) ?: $dependencyCounts;
+}
 
 // =========================
 // Optionen laden
@@ -133,7 +167,7 @@ $racks = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
             <button type="submit" class="button button-primary">Speichern</button>
             <a href="?module=devices&action=list" class="button">Abbrechen</a>
             <?php if ($isEdit): ?>
-                <a href="#" class="button button-danger" onclick="confirmDelete(<?php echo $deviceId; ?>)">Löschen</a>
+                <a href="?module=devices&action=delete&id=<?php echo (int)$deviceId; ?>" class="button button-danger" onclick="return confirmDelete(event, <?php echo (int)$deviceId; ?>, <?php echo (int)$dependencyCounts['connection_count']; ?>, <?php echo (int)$dependencyCounts['port_count']; ?>, <?php echo (int)$dependencyCounts['module_count']; ?>)">Löschen</a>
             <?php endif; ?>
         </fieldset>
 
@@ -233,9 +267,37 @@ $racks = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
 </style>
 
 <script>
-function confirmDelete(id) {
-    if (confirm('Dieses Gerät wirklich löschen?')) {
-        window.location.href = '?module=devices&action=delete&id=' + encodeURIComponent(id);
+function confirmDelete(event, id, connectionCount, portCount, moduleCount) {
+    if (event && typeof event.preventDefault === 'function') {
+        event.preventDefault();
     }
+
+    if (confirm('Dieses Gerät wirklich löschen?')) {
+        const hasDependencies = (connectionCount > 0) || (portCount > 0) || (moduleCount > 0);
+        if (hasDependencies) {
+            const details = [];
+            if (connectionCount > 0) {
+                details.push(connectionCount + ' Verbindungen');
+            }
+            if (portCount > 0) {
+                details.push(portCount + ' Ports');
+            }
+            if (moduleCount > 0) {
+                details.push(moduleCount + ' Port-Module');
+            }
+            const dependencyMessage = 'Es gibt abhängige Daten (' + details.join(', ') + '). Diese auch löschen?';
+            if (!confirm(dependencyMessage)) {
+                return false;
+            }
+            window.location.href = '?module=devices&action=delete&id=' + encodeURIComponent(id) + '&force=1';
+            return false;
+        }
+
+        window.location.href = '?module=devices&action=delete&id=' + encodeURIComponent(id);
+        return false;
+    }
+
+    return false;
 }
 </script>
+
diff --git a/app/modules/devices/list.php b/app/modules/devices/list.php
index fbe2986..289a35b 100644
--- a/app/modules/devices/list.php
+++ b/app/modules/devices/list.php
@@ -62,8 +62,29 @@ $whereSql = $where ? 'WHERE ' . implode(' AND ', $where) : '';
                 d.web_config_url,
                 dt.name AS device_type,
                 dt.image_path,
-        f.name AS floor_name,
-        r.name AS rack_name
+                f.name AS floor_name,
+                r.name AS rack_name,
+                (
+                    SELECT COUNT(*)
+                    FROM device_ports dp
+                    WHERE dp.device_id = d.id
+                ) AS port_count,
+                (
+                    SELECT COUNT(*)
+                    FROM device_port_modules dpm
+                    JOIN device_ports dp2 ON dp2.id = dpm.device_port_id
+                    WHERE dp2.device_id = d.id
+                ) AS module_count,
+                (
+                    SELECT COUNT(*)
+                    FROM connections c
+                    WHERE (c.port_a_type = 'device' AND c.port_a_id IN (
+                            SELECT dp3.id FROM device_ports dp3 WHERE dp3.device_id = d.id
+                          ))
+                       OR (c.port_b_type = 'device' AND c.port_b_id IN (
+                            SELECT dp4.id FROM device_ports dp4 WHERE dp4.device_id = d.id
+                          ))
+                ) AS connection_count
     FROM devices d
     JOIN device_types dt ON dt.id = d.device_type_id
     LEFT JOIN racks r ON r.id = d.rack_id
@@ -201,10 +222,7 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
 
                 <td class="actions">
                     <a href="?module=devices&action=edit&id=<?php echo $d['id']; ?>" class="button button-small">Bearbeiten</a>
-                    <a href="#" class="button button-small button-danger" onclick="confirmDelete(<?php echo $d['id']; ?>)">Löschen</a>
-                    <?php
-                    //TODO löschen geht nicht
-                    ?>
+                    <a href="?module=devices&action=delete&id=<?php echo (int)$d['id']; ?>" class="button button-small button-danger" onclick="return confirmDelete(event, <?php echo (int)$d['id']; ?>, <?php echo (int)$d['connection_count']; ?>, <?php echo (int)$d['port_count']; ?>, <?php echo (int)$d['module_count']; ?>)">Löschen</a>
                 </td>
             </tr>
             <?php endforeach; ?>
@@ -332,9 +350,37 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
 </style>
 
 <script>
-function confirmDelete(id) {
-    if (confirm('Dieses Gerät wirklich löschen?')) {
-        window.location.href = '?module=devices&action=delete&id=' + encodeURIComponent(id);
+function confirmDelete(event, id, connectionCount, portCount, moduleCount) {
+    if (event && typeof event.preventDefault === 'function') {
+        event.preventDefault();
     }
+
+    if (confirm('Dieses Gerät wirklich löschen?')) {
+        const hasDependencies = (connectionCount > 0) || (portCount > 0) || (moduleCount > 0);
+        if (hasDependencies) {
+            const details = [];
+            if (connectionCount > 0) {
+                details.push(connectionCount + ' Verbindungen');
+            }
+            if (portCount > 0) {
+                details.push(portCount + ' Ports');
+            }
+            if (moduleCount > 0) {
+                details.push(moduleCount + ' Port-Module');
+            }
+            const dependencyMessage = 'Es gibt abhängige Daten (' + details.join(', ') + '). Diese auch löschen?';
+            if (!confirm(dependencyMessage)) {
+                return false;
+            }
+            window.location.href = '?module=devices&action=delete&id=' + encodeURIComponent(id) + '&force=1';
+            return false;
+        }
+
+        window.location.href = '?module=devices&action=delete&id=' + encodeURIComponent(id);
+        return false;
+    }
+
+    return false;
 }
 </script>
+
diff --git a/app/modules/racks/list.php b/app/modules/racks/list.php
index 8f8ff8d..b4d0d43 100644
--- a/app/modules/racks/list.php
+++ b/app/modules/racks/list.php
@@ -14,6 +14,8 @@
 $search = trim($_GET['search'] ?? '');
 $floorId = (int)($_GET['floor_id'] ?? 0);
 
+//TODO racks beim editieren auf der stockwerkkarte platzieren und verschieben können
+
 // =========================
 // WHERE-Clause bauen
 // =========================