Direktverbindung fuer unverbundene Ports zum Patchfeld anbieten

closes #25

AGENTS.md

@@ -1,55 +1,58 @@
 # AGENTS.md
 
-## Ziel der Datei
-Dieses Dokument beschreibt, welche Informationen ich als Agent für `p:\netwatch` erwarten würde: Projektziel, Setup, Regeln, Skills, bekannte Issues, Kontext & Einschränkungen.
+## Ziel
+Codex arbeitet pragmatisch bei Aufgaben aus `NEXT.md` und User-Requests.
+Ein Gitea-Issue ist optional.
 
-## Projektüberblick
-- Name: **netwatch** – ein Netzwerk-Dokumentations- und Verkabelungsverwaltungs-Tool (Alpha v0.2, Core-Module funktionsfähig, Stand: 13. Februar 2026).
-- Features: Dashboard, Gerätetypen-/Geräteverwaltung, Racks/Floors mit SVG-Planung, Verbindungen inkl. VLANs, Module, grafische Ansichten (Rack, Netzwerkgraph, Stockwerke/Räume).
-- Datenmodell: zentrales SQL-Schema (`locations`, `device_types`, `devices`, `connections` etc.) mit JSON-Erweiterungsmöglichkeiten.
-- Projektphasen (Phase 1–4) sind im README gelistet, siehe letzte Abschnitte.
+## Kernregeln
 
-## Schneller Projektstart
-```powershell
-docker-compose up -d --build
-# danach: http://localhost
+1. Ein Issue ist **nicht erforderlich**, um eine Aufgabe umzusetzen.
+2. Skills duerfen jederzeit verwendet werden (z. B. `gitea-issues`).
+3. Ein `NEXT.md`-Punkt darf erst auf erledigt (`[x]`) gesetzt werden, wenn die Umsetzung im Code erfolgt ist.
+4. Nur wenn ein Gitea-Issue konkret referenziert ist **und** durch die Aenderung abgeschlossen wird, muss die Commit-Message `closes #<id>` enthalten.
+5. Jede `closes`-Referenz steht in einer **eigenen Zeile**.
+6. Kein `closes #<id>`, wenn das Issue nicht tatsaechlich abgeschlossen ist.
+7. `git push` nur auf explizite Aufforderung; standardmaessig nur committen.
+
+## Verbindlicher Ablauf
+
+1. Aufgabe umsetzen (aus `NEXT.md` oder User-Anfrage).
+2. Optional Issues laden, wenn Kontext/Zuordnung noetig ist:
+   - `python C:/Users/s.titz/.codex/skills/gitea-issues/scripts/list_issues.py <owner> <repo> --state open --limit 100 --json`
+3. `NEXT.md` bei Bedarf aktualisieren (mit oder ohne `[#<id>]`).
+4. Commit erstellen.
+5. Wenn Issue abgeschlossen wird, Commit-Message mit eigener `closes`-Zeile schreiben.
+
+## Commit-Format bei Issue-Abschluss
+
+Beispiel mit einem Issue:
+
+```text
+Kurzbeschreibung der Aenderung
+
+closes #42
 ```
-Das Docker-Setup (Compose + Portainer) liegt in `docker-compose.yml` und `docker-portainer.yml`, ergänzende Infos in `Dockerfile`.
 
-## Skills & Nutzungshinweise
-- **skill-creator** – Anleitung zum Erstellen bzw. Erweitern eigener Skills. Pfad: `C:/Users/s.titz/.codex/skills/.system/skill-creator/SKILL.md`.
-- **skill-installer** – Anleitung zum Installieren zusätzlicher Skills aus Kurationslisten oder GitHub. Pfad: `C:/Users/s.titz/.codex/skills/.system/skill-installer/SKILL.md`.
+Beispiel mit mehreren Issues:
 
-Wenn ein Skill genannt wird (z. B. `$skill-creator`) oder die Aufgabe exakt zur Beschreibung passt, muss dieser Skill in dem Turn verwendet werden. Skills immer erst öffnen (`SKILL.md`), nur nötige Teile lesen, relative Pfade innerhalb des Skill-Verzeichnisses auflösen. Bei mehreren Skills: minimaler Satz in sinnvoller Reihenfolge, kurz ankündigen, warum welche Skills genutzt wurden.
+```text
+Kurzbeschreibung der Aenderung
 
-## Lokale Arbeitsregeln
-- Arbeitsumgebung: Windows, Pfad `P:\netwatch`, Shell `powershell`. Schreibzugriff für mich hier ist verboten; Änderungen müssen vom Nutzer übernommen werden.
-- Suche: Nutze `rg`/`rg --files` statt `grep`/`find` für Geschwindigkeit.
-- Codeänderungen: Nur ASCII-Zeichen einführen (außer bestehende Dateien nutzen Unicode); Formate ohne `apply_patch` nur wenn nötig; preferiere `apply_patch`.
-- Keine destruktiven Git-Befehle ohne ausdrückliche Aufforderung (z. B. keinen `reset --hard`).
-- Tests/Builds: Wenn nötig, nenne passende Tests / Prüfmethoden als nächsten Schritt.
-- Kommunikation: Verwende beim Antworten absolute Datumsangaben (z. B. „13. Februar 2026“) wenn sich jemand auf „heute/morgen“ bezieht, um Missverständnisse zu vermeiden.
+closes #12
+closes #18
+```
 
-## Bekannte Bugs (aus `BUGS.md`)
-- Gerät löschen funktioniert nicht (Status unklar).
-- Gerätetypen SVG-Modul: Malfunktion.
-- Ports Drag & Drop (Funktion unklar).
-- Beim Erstellen von Gerätetypen soll ein voreingestelltes Rechteck basierend auf 19-Zoll & HE-Größe erzeugt werden, das als Grundgerüst dient.
-- Device-Typ-Erstellung: Klick auf Objekt-Typ-Button, dann Drag-Drop für Diagonale und Loslassen fixiert Position.
+## Format fuer NEXT.md
 
-## Weitere Ressourcen
-- `NEXT_STEPS.md` (aktuelles ToDo / Roadmap).
-- `IMPLEMENTATION_STATUS.md` (Status-Tracking).
-- `README.md` (Feature- und Architekturübersicht).
+- Offen ohne Issue:
+  - `- [ ] //TODO Backup-Runbook erstellen`
+- Offen mit Issue:
+  - `- [ ] [#42] //TODO Backup-Runbook erstellen`
+- Erledigt mit Issue:
+  - `- [x] [#42] Backup-Runbook erstellen`
+- Erledigt ohne Issue:
+  - `- [x] Backup-Runbook erstellen`
 
-## Besonderheiten / Kommunikation
-- Aktuelles Datum: Freitag, 13. Februar 2026 (nicht überschreiben).
-- Keine Netzwerkanfragen möglich; Referenzen nur lokal nutzen.
-- Wenn ein Agent spezielle Instruktionen benötigt (z. B. Skill-Anwendung), immer darauf hinweisen und ggf. den Nutzer nach Bestätigung fragen.
+## Annahme
 
-## Einschränkungen
-- Sandbox ist lesend; bitte selbst `AGENTS.md` anlegen.
-- Jegliche Ausgaben/Antworten sollten den Developer-Guidelines folgen (kurz, teamorientiert, klare nächste Schritte).
-
-## Wichtig:
-- Nutze UTF-8 wenn nicht anders angegeben
+- Gitea ist so konfiguriert, dass `closes #<id>` in Commit-Messages das Issue schliesst.

BUGS.md

@@ -1,3 +0,0 @@
-# gefundene bugs
-- [ ] device löschen geht nicht
-- [ ] TODO Design vereinheitlichen

IMPLEMENTATION_STATUS.md

@@ -70,16 +70,16 @@
 2. **Datenbank-Zugriff** - SQL-Klasse lädt und speichert Daten
 3. **Responsive Design** - Alle Formulare und Listen sind formatiert
 4. **Filter & Suche** - Alle Module haben Suchfunktionen
-5. **CRUD-Operationen** - Create, Read, Update für alle Hauptmodule
+5. **CRUD-Operationen** - Create, Read, Update, Delete für alle Hauptmodule
 
 ---
 
 ## ⚠️ Noch zu machen (Not-Must-Have)
 
 ### Höhere Priorität:
-- [ ] **Delete-Funktionen** - Löschen noch als TODO (als AJAX implementieren)
+- [x] **Delete-Funktionen** - Delete-Endpoints für Kernmodule inkl. `connections` und `floor_infrastructure` umgesetzt
 - [ ] **Fehlerbehandlung** - Error Pages, Validierungsmeldungen
-- [ ] **Session/Auth** - Single-User Auth in bootstrap.php
+- [x] **Session/Auth** - Single-User-Auth mit `requireAuth()` und `app/lib/auth.php` eingebunden
 - [ ] **SVG-Editor** - Interaktiver Floorplan-Editor für Räume/Dosen
 - [ ] **Port-Management** - Ports zu Geräten zuweisen
 
@@ -106,7 +106,7 @@ app/
 ├── lib/
 │   ├── _sql.php          ✅ DB-Wrapper
 │   ├── helpers.php       ✅ Utility-Funktionen
-│   └── auth.php          🚧 TODO: Auth
+│   └── auth.php          ✅ Auth-Helper + requireAuth()
 ├── templates/
 │   ├── layout.php        ✅ HTML-Layout
 │   ├── header.php        ✅ Header/Nav
@@ -132,7 +132,7 @@ app/
 ## 💡 Nächste Schritte (empfohlen)
 
 1. **Testen Sie die Module** - Probieren Sie Anlegen/Bearbeiten aus
-2. **Implementieren Sie Delete-Funktionen** - Mit AJAX oder POST
+2. **Delete-Flows prüfen** - Sonderfälle und Fehlermeldungen bei Abhängigkeiten testen
 3. **Bessere Fehlerbehandlung** - Sessions für Error-Messages
 4. **Mobile-Optimierung** - Responsive Verbesserungen
 5. **SVG-Editor für Floorplans** - Visuelles Raumdesign

NEXT.md

@@ -0,0 +1,18 @@
+# NEXT_STEPS
+
+## Aktive Aufgaben (priorisiert)
+- [x] [#25] bei unverbundenen ports direkt eine verbindung zu einem patchfeld anbieten und das formular vorausfuellen
+- [x] [#26] patchfelder haben natürlich auf den gleichen port eine feste verdrahtung und dann ein patchkabel zum switch, bei wand buchsen muss das auch erlaubt sein
+- [x] [#24] infrastruktur stockerkkarte zoomen wird die grundrisskarten overlay nicht mitgezoomt
+- [x] [#23] netzwerkdosen haben nur port 1 und brauche in den auswahlen nicht mit port 1 angezeigt zu werden
+- [x] [#22] für neue verbindungen nur ports anbieten die noch keine verbingung haben
+- [x] [#20] Gesamt-Topologie-Wand im dashboard ist schwarze
+- [x] [#19] gerät nicht löschbar wegen ports, ports sind aber nicht löschbar
+- [x] [#18] wandbuchsen direkt beim erstellen schon an patchpanel bindfen
+- [x] [#17] infrastruktur karten zoombar, um objekte besser positionieren zu können, steps soll aber immernoch 1 bleiben
+
+## Verifikation (Status unklar, nicht als erledigt markieren ohne Reproduktion + Commit)
+- [x] [#15] Neue Verbindung: Netzwerkdose auswählbar (Regressionstest in UI durchgeführt)
+
+## gefundene bugs
+- [x] Design vereinheitlichen

NEXT_STEPS.md

@@ -1,162 +0,0 @@
-# 📋 NÄCHSTE ARBEITSPAKETE
-
-## 🎯 Für die nächsten Sessions
-
-### Package 1: Fehlerbehandlung & Sessions (1-2h)
-- [ ] Session-Handling in `bootstrap.php` implementieren
-- [ ] Error-Messages in Session speichern ($SESSION['error'], $SESSION['success'])
-- [ ] Header mit Fehlermeldungen in Layout
-- [ ] Validierungsfehler anzeigen
-
-### Package 2: Delete-Funktionen (1h)
-- [ ] DELETE-Endpoints für alle Module
-- [ ] AJAX-Bestätigung vor Löschen
-- [ ] Kaskadierendes Löschen prüfen (z.B. Floor → Racks)
-
-### Package 3: Port-Management (2-3h)
-- [ ] Ports zu Device-Types verwalten
-- [ ] Ports zu Devices anzeigen
-- [ ] Port-Status (aktiv/inaktiv)
-- [ ] VLAN-Zuordnung zu Ports
-
-### Package 4: SVG-Editor für Floorplans (4-5h)
-- [ ] Interaktiver SVG-Editor für Rooms
-- [ ] Netzwerkdosen platzieren
-- [ ] Dosen nummerieren
-- [ ] Speicher-Integration
-
-### Package 5: Navigation & UI (1-2h)
-- [ ] Breadcrumbs hinzufügen
-- [ ] Mobile-Menü verbessern
-- [ ] CSS polieren (Farben, Abstände)
-- [ ] Dark-Mode (optional)
-
----
-
-## 📚 Code-Referenzen
-
-### Template für neue CRUD-Module:
-```php
-// list.php: Filter + Tabelle
-// edit.php: Formular
-// save.php: POST-Handler mit Validierung
-
-// Immer verwenden:
-$sql->get()      // SELECT mit Bind-Params
-$sql->single()   // SELECT LIMIT 1
-$sql->set()      // INSERT/UPDATE
-```
-
-### Filter-Pattern (in allen List-Modules):
-```php
-$where = [];
-$types = '';
-$params = [];
-
-if ($search !== '') {
-    $where[] = "name LIKE ?";
-    $types .= "s";
-    $params[] = "%$search%";
-}
-
-$whereSql = $where ? "WHERE " . implode(" AND ", $where) : "";
-// Dann in Query einsetzen
-```
-
-### Styling-Pattern:
-- Buttons: `.button`, `.button-primary`, `.button-danger`, `.button-small`
-- Tabellen: `.*.list` Klasse mit th/td Styling
-- Forms: `.edit-form`, `.form-group`, `.form-actions`
-- States: `.empty-state`, `.filter-form`
-
----
-
-## 🔧 Bekannte TODOs im Code
-
-Alle noch offenen Punkte sind mit `// TODO:` gekennzeichnet:
-
-```bash
-# Alle TODOs finden:
-grep -r "TODO:" app/modules/ --include="*.php"
-```
-
-Wichtigste TODOs:
-- `index.php:19` - Session starten
-- `*/save.php` - Fehlerbehandlung
-- `connections/` - Port-Verknüpfung
-- `lib/auth.php` - Auth-Logik
-
----
-
-## 💾 Datenbank-Setup
-
-Die Datenbank wird automatisch durch `init.sql` initialisiert.
-
-Wichtige Tabellen:
-- `locations` - Standorte
-- `buildings` - Gebäude
-- `floors` - Stockwerke
-- `rooms` - Räume
-- `network_outlets` - Netzwerkdosen
-- `device_types` - Gerätetypen
-- `device_type_ports` - Port-Templates
-- `devices` - konkrete Geräte
-- `device_ports` - Gerätports
-- `racks` - Racks
-- `connections` - Verbindungen zwischen Ports
-
----
-
-## 🧪 Testing-Checklist
-
-Bei jeder Änderung checken:
-- [ ] Formular sendet Daten korrekt
-- [ ] Daten werden in DB gespeichert
-- [ ] Liste zeigt neue Daten
-- [ ] Edit lädt existierende Daten vor
-- [ ] Filter funktioniert
-- [ ] Validierungsfehler werden angezeigt
-
----
-
-## 🎨 Design-Richtlinien
-
-### Farben:
-- Primary (Buttons): `#007bff` (Blau)
-- Success (Speichern): `#28a745` (Grün)
-- Danger (Löschen): `#dc3545` (Rot)
-- Background: `#f9f9f9` (Hell)
-- Border: `#ddd` (Hell-Grau)
-
-### Spacing:
-- Padding in Forms: `15px` (fieldset), `8px` (input)
-- Gap zwischen Buttons: `10px`
-- Margin: `20px` (oben/unten), `0` (inline)
-
-### Schriftarten:
-- Erben von HTML (derzeit: System)
-- Monospace für Code/IDs: `font-family: monospace`
-
----
-
-**Happy Coding! 🚀**
-
-## Aktuell offene TODOs (Stand: 18. Februar 2026)
-
-- [ ] #15 Neue Verbindung: Es kann keine Netzwerkdose ausgewahlt werden.
-- [ ] #14 Hilfslinien der Stockwerkskarten nur im Edit-Mode anzeigen; im Anzeige-Mode ausblenden.
-- [ ] #11 Encoding- und Umlautfehler beheben (inkl. ae/oe/ue-Themen).
-- [ ] #10 Dashboard-Grafik erzeugen:
-  - Oberste Ebene: Locations, ggf. mit Unterordnung.
-  - Darunter: Gebaudekomplexe mit Rack-Verbindungen.
-  - Darunter: Stockwerke.
-  - Darunter: Etagenweise Verbindungen.
-- [ ] #8 Gerate löschen fehlt: Es erfolgt Weiterleitung, aber keine echte Fehlermeldung.
-- [ ] #7 Letzten Punkt im Floor-Editor löschen:
-  - URL: `http://localhost/?module=floors&action=edit&id=1`
-- [ ] #5 Dashboard als zoombare und verschiebbare SVG-Flache:
-  - Gerate anordnen.
-  - Gerate, Ports und Verbindungen anklickbar.
-  - Sprechblase mit Infos und Buttons zu Bereichen (editieren, entfernen, ...).
-- [ ] #4 `device_types/edit`: Option "Ports automatisch erstellen" nur beim Erstellen anzeigen, nicht beim Editieren.
-

README.md

@@ -238,19 +238,19 @@ Verbindungen werden:
   - Die untereinander verbundenen Patchpanels lassen sich direkt auf der SVG-Stockwerkskarte verorten, damit jeder Port physisch nachvollziehbar bleibt.
 - Verbindungen zu Racks / Switches darstellbar
 
-### TODO: Patchpanel-Infrastruktur
-- [ ] Floorplans erweitern, damit Patchpanels als feste Infrastrukturobjekte (nicht als rack-basierte `devices`) angelegt, verschoben und mit `x/y`/Größe verankert werden.
-- [ ] Backend und SVG-Editor dahingehend adaptieren, dass Patchpanel-Ports unabhängig von Racks definiert werden können.
-- [ ] Patchpanel ↔ Patchpanel- und Patchpanel ↔ Netzwerkbuchse-Verbindungen als permanente Kabel zwischen Floorplan-Objekten darstellen und über die `connections`-Tabelle verwalten.
-- [ ] UI/Schema-Dokumentation aktualisieren (README + Datenbank-Docs) sowie neue SQL-Tabellen (`floor_patchpanels` / `floor_patchpanel_ports`) fertigstellen.
-- [ ] Floorplan-Filter/Legend leiten die Nutzung dieser Infrastrukturobjekte, Kampagnen und Search & Filter integrieren.
+### Patchpanel-Infrastruktur (Status: 18. Februar 2026)
+- [x] Floorplans erweitert: Patchpanels können als feste Infrastrukturobjekte (ohne Rack-Device) inkl. `x/y` und Größe verwaltet werden.
+- [x] Backend + SVG-Editor angepasst: Patchpanel-Ports werden über `floor_patchpanel_ports` gepflegt.
+- [x] Patchpanel ↔ Patchpanel und Patchpanel ↔ Netzwerkbuchse werden über `connections` verwaltet.
+- [x] SQL-Tabellen `floor_patchpanels` / `floor_patchpanel_ports` sind im Schema enthalten.
+- [ ] Floorplan-Filter/Legend und erweiterte Suche für Infrastrukturobjekte weiter ausbauen.
 
 ### Stockwerksinfrastruktur-Modul
 - Das neue Modul „Stockwerksinfrastruktur“ sammelt Patchpanels und Wandbuchsen an einem Ort.
 - Patchfelder bekommen feste X/Y-Positionen, Maße, Portanzahl und verknüpfen zu Floorplans.
 - Wandbuchsen sind direkt mit Räumen verbunden, können aber auch später im SVG verteilt werden.
 - Ziel: Die Floorplan-Grafik zeigt die permanente Infrastruktur samt fest verlegter Kabelverläufe.
-- TODO: SVG-Editor um Drag & Drop für diese Objekte erweitern und Klicks direkt mit dem Modul verbinden.
+- [x] SVG-Editor für diese Objekte ist mit Drag & Drop umgesetzt und direkt mit dem Modul verbunden.
 
 ---
 

TODO.md

@@ -1,36 +0,0 @@
-# TODO
-
-Bereinigte und aktuelle TODO-Liste (Stand: 18. Februar 2026).
-Quelle: vorhandene `TODO`-Marker im Repository plus offene Architekturpunkte.
-
-## Erledigt (bereits umgesetzt)
-
-- [x] API-Basis umgesetzt (`app/api/connections.php`, `app/api/device_type_ports.php`, `app/api/upload.php`).
-- [x] Bootstrap/Auth/Config/Routing-Grundlagen umgesetzt (`app/config.php`, `app/bootstrap.php`, `app/lib/_sql.php`, `app/lib/auth.php`, `app/index.php`).
-- [x] Frontend-Grundlagen aktualisiert (`app/assets/js/app.js`, `app/assets/js/dashboard.js`, `app/assets/js/svg-editor.js`, `app/assets/js/network-view.js`).
-- [x] Delete-Flow fuer zentrale Module umgesetzt (`buildings`, `floors`, `racks`, `device_types`, `floor_infrastructure`).
-- [x] Legacy-Mock in `app/modules/device_types/ports.php` ersetzt.
-- [x] Veraltete Sammel-TODO-Liste (nicht mehr im Code vorhanden) entfernt.
-
-## Offen (direkt im Code markiert)
-
-- [x] `app/modules/dashboard/list.php`: zoombare/verschiebbare SVG-Wand mit klickbaren Punkten und Overlay-Drilldown umgesetzt.
-- [x] `app/modules/connections/list.php`: Detailbereich fuer ausgewaehlte Verbindung inkl. Bearbeiten/Loeschen im UI umgesetzt.
-- [x] `app/lib/helpers.php`: konkrete allgemeine Helper ergaenzt (`formatDateTime`, `formatBytes`, `generateUuidV4`, `normalizeSvgCoordinate`).
-
-## Offen (Bugs / Doku / Statusdateien)
-
-- [ ] `BUGS.md:3`: Design vereinheitlichen.
-- [ ] `IMPLEMENTATION_STATUS.md:80`: Delete-Funktionen-Status aktualisieren.
-- [ ] `IMPLEMENTATION_STATUS.md:109`: Auth-Status aktualisieren.
-- [ ] `README.md:241`: Patchpanel-Infrastruktur umsetzen und danach Doku abhaken.
-- [ ] `README.md:253`: SVG-Editor fuer Floor-Infrastruktur (Drag-and-Drop + direkte Modul-Interaktion).
-- [ ] `doc/DATABASE.md:127`: TODO-Abschnitt fuer Patchpanel/Floorplan finalisieren.
-- [ ] `init.sql:379`: Kommentar zur Port-Konfiguration in verbindliche Implementierungsregeln ueberfuehren.
-
-## Topologie-Backlog (ausstehend)
-
-- [ ] `connections.port_a_type` / `connections.port_b_type` um `patchpanel` erweitern und auf `floor_patchpanel_ports.id` referenzieren.
-- [ ] Validierungsregeln fuer Topologie fest verdrahten (Patchpanel-Port nur mit Patchpanel-Port oder Netzwerkbuchsen-Port).
-- [ ] Port-CRUD fuer Patchpanels: `floor_patchpanel_ports` aus `port_count` erzeugen/synchronisieren.
-- [ ] Port-CRUD fuer Netzwerkbuchsen: `network_outlet_ports` pflegen (mindestens ein Port je Buchse) und in Verbindungen nutzbar machen.

app/api/connections.php

@@ -77,6 +77,100 @@ function endpointExists($sql, string $type, int $id): bool
     return false;
 }
 
+function isTopologyPairAllowed(string $typeA, string $typeB): bool
+{
+    $allowed = ['device' => true, 'module' => true, 'outlet' => true, 'patchpanel' => true];
+    if (!isset($allowed[$typeA]) || !isset($allowed[$typeB])) {
+        return false;
+    }
+    if ($typeA === 'patchpanel' || $typeB === 'patchpanel') {
+        return ($typeA === 'patchpanel' && in_array($typeB, ['patchpanel', 'outlet'], true))
+            || ($typeB === 'patchpanel' && in_array($typeA, ['patchpanel', 'outlet'], true));
+    }
+    return true;
+}
+
+function buildEndpointUsageMap($sql, int $excludeConnectionId = 0): array
+{
+    $usage = [
+        'device' => [],
+        'module' => [],
+        'outlet' => [],
+        'patchpanel' => [],
+    ];
+
+    $rows = $sql->get(
+        "SELECT id, port_a_type, port_a_id, port_b_type, port_b_id
+         FROM connections
+         WHERE id <> ?",
+        'i',
+        [$excludeConnectionId]
+    );
+
+    $track = static function (string $endpointType, int $endpointId, string $otherType) use (&$usage): void {
+        if ($endpointId <= 0 || !isset($usage[$endpointType])) {
+            return;
+        }
+        if (!isset($usage[$endpointType][$endpointId])) {
+            $usage[$endpointType][$endpointId] = [
+                'total' => 0,
+                'fixed' => 0,
+                'patch' => 0,
+            ];
+        }
+
+        $usage[$endpointType][$endpointId]['total']++;
+        if (in_array($endpointType, ['outlet', 'patchpanel'], true)) {
+            if (in_array($otherType, ['outlet', 'patchpanel'], true)) {
+                $usage[$endpointType][$endpointId]['fixed']++;
+            } elseif (in_array($otherType, ['device', 'module'], true)) {
+                $usage[$endpointType][$endpointId]['patch']++;
+            }
+        }
+    };
+
+    foreach ((array)$rows as $row) {
+        $typeA = normalizeEndpointType((string)($row['port_a_type'] ?? ''));
+        $typeB = normalizeEndpointType((string)($row['port_b_type'] ?? ''));
+        $idA = (int)($row['port_a_id'] ?? 0);
+        $idB = (int)($row['port_b_id'] ?? 0);
+        if ($typeA === null || $typeB === null) {
+            continue;
+        }
+        $track($typeA, $idA, $typeB);
+        $track($typeB, $idB, $typeA);
+    }
+
+    return $usage;
+}
+
+function validateEndpointCapacity(array $usage, string $endpointType, int $endpointId, string $otherType, string $label): ?string
+{
+    if ($endpointId <= 0) {
+        return null;
+    }
+
+    $stats = $usage[$endpointType][$endpointId] ?? ['total' => 0, 'fixed' => 0, 'patch' => 0];
+    if ((int)$stats['total'] <= 0) {
+        return null;
+    }
+
+    if (in_array($endpointType, ['outlet', 'patchpanel'], true)) {
+        if ((int)$stats['total'] >= 2) {
+            return $label . ' hat bereits die maximale Anzahl von 2 Verbindungen';
+        }
+        if (in_array($otherType, ['outlet', 'patchpanel'], true) && (int)$stats['fixed'] >= 1) {
+            return $label . ' hat bereits eine feste Verdrahtung';
+        }
+        if (in_array($otherType, ['device', 'module'], true) && (int)$stats['patch'] >= 1) {
+            return $label . ' hat bereits ein Patchkabel';
+        }
+        return null;
+    }
+
+    return $label . ' ist bereits in Verwendung';
+}
+
 function loadConnections($sql): void
 {
     $contextType = strtolower(trim((string)($_GET['context_type'] ?? 'all')));
@@ -189,6 +283,9 @@ function saveConnection($sql): void
     if ($portAId <= 0 || $portBId <= 0) {
         jsonError('port_a_id und port_b_id sind erforderlich', 400);
     }
+    if (!isTopologyPairAllowed($portAType, $portBType)) {
+        jsonError('Patchpanel-Ports duerfen nur mit Patchpanel-Ports oder Netzwerkdosen-Ports verbunden werden', 400);
+    }
 
     if ($portAType === $portBType && $portAId === $portBId) {
         jsonError('Port A und Port B duerfen nicht identisch sein', 400);
@@ -210,9 +307,20 @@ function saveConnection($sql): void
     $mode = isset($data['mode']) ? (string)$data['mode'] : null;
     $comment = isset($data['comment']) ? (string)$data['comment'] : null;
 
-    if (!empty($data['id'])) {
-        $id = (int)$data['id'];
-        $existing = $sql->single('SELECT id FROM connections WHERE id = ?', 'i', [$id]);
+    $connectionId = !empty($data['id']) ? (int)$data['id'] : 0;
+    $usage = buildEndpointUsageMap($sql, $connectionId);
+    $capacityErrorA = validateEndpointCapacity($usage, $portAType, $portAId, $portBType, 'Port an Endpunkt A');
+    if ($capacityErrorA !== null) {
+        jsonError($capacityErrorA, 409);
+    }
+    $capacityErrorB = validateEndpointCapacity($usage, $portBType, $portBId, $portAType, 'Port an Endpunkt B');
+    if ($capacityErrorB !== null) {
+        jsonError($capacityErrorB, 409);
+    }
+
+    if ($connectionId > 0) {
+        $id = $connectionId;
+        $existing = $sql->single('SELECT id FROM connections WHERE id = ?', 'i', [$connectionId]);
         if (!$existing) {
             jsonError('Verbindung existiert nicht', 404);
         }

app/assets/css/app.css

@@ -77,6 +77,42 @@ main {
     min-height: calc(100vh - 200px);
 }
 
+.flash-stack {
+    display: grid;
+    gap: 10px;
+    margin: 0 auto 18px;
+    max-width: 1200px;
+}
+
+.flash-message {
+    border-radius: 8px;
+    border: 1px solid transparent;
+    padding: 12px 14px;
+    background: #f8fafc;
+}
+
+.flash-message--success {
+    border-color: #99dfba;
+    background: #ebf9f1;
+    color: #165938;
+}
+
+.flash-message--error {
+    border-color: #efb4b4;
+    background: #fff1f1;
+    color: #8a1f1f;
+}
+
+.flash-message__text {
+    margin: 0;
+    font-weight: 600;
+}
+
+.flash-message__list {
+    margin: 8px 0 0 18px;
+    padding: 0;
+}
+
 /* Shared components -------------------------------------------------- */
 .filter-form {
     margin: 20px 0;
@@ -172,6 +208,48 @@ main {
     border-radius: 8px;
 }
 
+.connections-layout {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) 320px;
+    gap: 20px;
+    align-items: start;
+}
+
+.connections-sidebar {
+    position: sticky;
+    top: 92px;
+    display: grid;
+    gap: 12px;
+}
+
+.sidebar-card {
+    background: #fff;
+    border: 1px solid #e0e6ef;
+    border-radius: 12px;
+    padding: 14px;
+    box-shadow: 0 8px 24px rgba(15, 26, 45, 0.08);
+}
+
+.sidebar-card h3,
+.sidebar-card h4 {
+    margin: 0 0 10px;
+}
+
+.sidebar-card p {
+    margin: 0 0 8px;
+}
+
+.sidebar-actions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    margin-top: 10px;
+}
+
+.connection-row-selected {
+    background: #edf5ff;
+}
+
 @media (max-width: 900px) {
     .connections-list th,
     .connections-list td {
@@ -179,6 +257,17 @@ main {
     }
 }
 
+@media (max-width: 1100px) {
+    .connections-layout {
+        grid-template-columns: 1fr;
+    }
+
+    .connections-sidebar {
+        position: static;
+        grid-template-columns: 1fr;
+    }
+}
+
 @media (max-width: 900px) {
     .app-header {
         flex-direction: column;

app/assets/css/floor-infrastructure-edit.css

@@ -44,17 +44,6 @@
     cursor: crosshair;
     overflow: hidden;
 }
-.floor-plan-svg {
-    position: absolute;
-    inset: 0;
-    width: 100%;
-    height: 100%;
-    object-fit: contain;
-    pointer-events: none;
-    z-index: 0;
-    opacity: 0.75;
-    border-radius: 6px;
-}
 .floor-plan-overlay {
     position: absolute;
     inset: 0;
@@ -63,6 +52,10 @@
     z-index: 2;
     touch-action: none;
 }
+.floor-plan-overlay .floor-plan-background {
+    opacity: 0.75;
+    pointer-events: none;
+}
 .floor-plan-overlay .active-marker {
     cursor: move;
 }

app/assets/js/connections-edit-form.js

@@ -51,8 +51,49 @@
         });
     }
 
+    function enforceTopologyTypeRules(typeA, typeB) {
+        const allowWithPatchpanel = { patchpanel: true, outlet: true };
+        const selectedA = typeA.value;
+        const selectedB = typeB.value;
+
+        const applyRules = (sourceType, targetSelect) => {
+            for (const option of targetSelect.options) {
+                const value = option.value;
+                if (!value) {
+                    option.disabled = false;
+                    continue;
+                }
+                if (sourceType === 'patchpanel') {
+                    option.disabled = !allowWithPatchpanel[value];
+                } else {
+                    option.disabled = false;
+                }
+            }
+            if (targetSelect.selectedOptions.length > 0 && targetSelect.selectedOptions[0].disabled) {
+                targetSelect.value = '';
+            }
+        };
+
+        applyRules(selectedA, typeB);
+        applyRules(selectedB, typeA);
+    }
+
     document.addEventListener('DOMContentLoaded', () => {
         bindPair('port_a_type', 'port_a_id');
         bindPair('port_b_type', 'port_b_id');
+
+        const typeA = document.getElementById('port_a_type');
+        const typeB = document.getElementById('port_b_type');
+        if (!typeA || !typeB) {
+            return;
+        }
+
+        const syncRules = () => {
+            enforceTopologyTypeRules(typeA, typeB);
+        };
+
+        syncRules();
+        typeA.addEventListener('change', syncRules);
+        typeB.addEventListener('change', syncRules);
     });
 })();

app/assets/js/floor-infrastructure-edit.js

@@ -29,8 +29,26 @@ document.addEventListener('DOMContentLoaded', () => {
     let markerX = 0;
     let markerY = 0;
     let dragging = false;
+    let panning = false;
+    let panStart = null;
     let dragOffsetX = 0;
     let dragOffsetY = 0;
+    let viewX = 0;
+    let viewY = 0;
+    let viewWidth = DEFAULT_PLAN_SIZE.width;
+    let viewHeight = DEFAULT_PLAN_SIZE.height;
+
+    overlay.setAttribute('preserveAspectRatio', 'none');
+
+    const backgroundImage = document.createElementNS(SVG_NS, 'image');
+    backgroundImage.classList.add('floor-plan-background');
+    backgroundImage.setAttribute('x', '0');
+    backgroundImage.setAttribute('y', '0');
+    backgroundImage.setAttribute('width', String(DEFAULT_PLAN_SIZE.width));
+    backgroundImage.setAttribute('height', String(DEFAULT_PLAN_SIZE.height));
+    backgroundImage.setAttribute('preserveAspectRatio', 'none');
+    backgroundImage.setAttribute('display', 'none');
+    overlay.appendChild(backgroundImage);
 
     const activeMarker = document.createElementNS(SVG_NS, 'rect');
     activeMarker.classList.add('active-marker');
@@ -45,7 +63,7 @@ document.addEventListener('DOMContentLoaded', () => {
 
     const planSize = { ...DEFAULT_PLAN_SIZE };
     const updateOverlayViewBox = () => {
-        overlay.setAttribute('viewBox', `0 0 ${planSize.width} ${planSize.height}`);
+        overlay.setAttribute('viewBox', `${viewX} ${viewY} ${viewWidth} ${viewHeight}`);
     };
 
     const updatePositionLabel = (x, y) => {
@@ -72,17 +90,57 @@ document.addEventListener('DOMContentLoaded', () => {
     };
 
     const toOverlayPoint = (clientX, clientY) => {
-        const pt = overlay.createSVGPoint();
-        pt.x = clientX;
-        pt.y = clientY;
-        const ctm = overlay.getScreenCTM();
-        if (!ctm) {
+        const rect = overlay.getBoundingClientRect();
+        if (rect.width <= 0 || rect.height <= 0) {
             return null;
         }
-        const transformed = pt.matrixTransform(ctm.inverse());
+        const ratioX = (clientX - rect.left) / rect.width;
+        const ratioY = (clientY - rect.top) / rect.height;
+        const transformed = {
+            x: viewX + (ratioX * viewWidth),
+            y: viewY + (ratioY * viewHeight)
+        };
         return { x: transformed.x, y: transformed.y };
     };
 
+    const clampView = () => {
+        const minWidth = Math.max(30, planSize.width * 0.1);
+        const minHeight = Math.max(30, planSize.height * 0.1);
+        viewWidth = clamp(viewWidth, minWidth, planSize.width);
+        viewHeight = clamp(viewHeight, minHeight, planSize.height);
+        viewX = clamp(viewX, 0, Math.max(0, planSize.width - viewWidth));
+        viewY = clamp(viewY, 0, Math.max(0, planSize.height - viewHeight));
+    };
+
+    const applyView = () => {
+        clampView();
+        updateOverlayViewBox();
+    };
+
+    const zoomAt = (clientX, clientY, factor) => {
+        const point = toOverlayPoint(clientX, clientY);
+        if (!point) {
+            return;
+        }
+        const ratioX = (point.x - viewX) / viewWidth;
+        const ratioY = (point.y - viewY) / viewHeight;
+        const nextWidth = viewWidth * factor;
+        const nextHeight = viewHeight * factor;
+        viewX = point.x - (ratioX * nextWidth);
+        viewY = point.y - (ratioY * nextHeight);
+        viewWidth = nextWidth;
+        viewHeight = nextHeight;
+        applyView();
+    };
+
+    const resetView = () => {
+        viewX = 0;
+        viewY = 0;
+        viewWidth = planSize.width;
+        viewHeight = planSize.height;
+        applyView();
+    };
+
     const updateFromInputs = () => {
         setMarkerPosition(Number(xField.value) || 0, Number(yField.value) || 0);
     };
@@ -191,10 +249,10 @@ document.addEventListener('DOMContentLoaded', () => {
     const panelBuildingSelect = document.getElementById('panel-building-select');
     const panelFloorSelect = document.getElementById('panel-floor-select');
     const outletRoomSelect = document.getElementById('outlet-room-select');
-    const floorPlanSvg = document.getElementById('floor-plan-svg');
     const panelPlacementFields = document.getElementById('panel-placement-fields');
     const panelFloorPlanGroup = document.getElementById('panel-floor-plan-group');
     const panelFloorMissingHint = document.getElementById('panel-floor-missing-hint');
+    const outletBindPatchpanelSelect = document.getElementById('outlet-bind-patchpanel-port-id');
 
     const buildingOptions = panelBuildingSelect ? Array.from(panelBuildingSelect.options).filter((option) => option.value !== '') : [];
     const floorOptions = panelFloorSelect ? Array.from(panelFloorSelect.options).filter((option) => option.value !== '') : [];
@@ -208,6 +266,32 @@ document.addEventListener('DOMContentLoaded', () => {
         return Number(roomOption?.dataset?.floorId || 0);
     };
 
+    const filterPatchpanelBindOptions = () => {
+        if (!outletBindPatchpanelSelect) {
+            return;
+        }
+        const currentFloorId = getCurrentFloorId();
+        const options = Array.from(outletBindPatchpanelSelect.options).filter((option) => option.value !== '');
+        let firstMatch = '';
+        let selectedStillVisible = false;
+
+        options.forEach((option) => {
+            const optionFloorId = Number(option.dataset.floorId || 0);
+            const matchesFloor = !currentFloorId || optionFloorId === currentFloorId;
+            option.hidden = !matchesFloor;
+            if (matchesFloor && !option.disabled && !firstMatch) {
+                firstMatch = option.value;
+            }
+            if (matchesFloor && option.selected) {
+                selectedStillVisible = true;
+            }
+        });
+
+        if (!selectedStillVisible && firstMatch && !outletBindPatchpanelSelect.value) {
+            outletBindPatchpanelSelect.value = firstMatch;
+        }
+    };
+
     const renderReferenceMarkers = () => {
         clearRoomHighlight();
         clearReferenceMarkers();
@@ -239,35 +323,27 @@ document.addEventListener('DOMContentLoaded', () => {
     };
 
     const updateFloorPlanImage = () => {
-        if (!floorPlanSvg) {
-            return;
-        }
-
         const floorOption = panelFloorSelect?.selectedOptions?.[0];
         const roomOption = outletRoomSelect?.selectedOptions?.[0];
         const svgUrl = floorOption?.dataset?.svgUrl || roomOption?.dataset?.floorSvgUrl || '';
 
         if (svgUrl) {
-            floorPlanSvg.src = svgUrl;
-            floorPlanSvg.hidden = false;
+            backgroundImage.setAttribute('href', svgUrl);
+            backgroundImage.setAttribute('width', String(planSize.width));
+            backgroundImage.setAttribute('height', String(planSize.height));
+            backgroundImage.setAttribute('display', 'block');
             loadPlanDimensions(svgUrl);
         } else {
-            floorPlanSvg.removeAttribute('src');
-            floorPlanSvg.hidden = true;
+            backgroundImage.removeAttribute('href');
+            backgroundImage.setAttribute('display', 'none');
             planSize.width = DEFAULT_PLAN_SIZE.width;
             planSize.height = DEFAULT_PLAN_SIZE.height;
-            updateOverlayViewBox();
+            resetView();
         }
         renderReferenceMarkers();
+        filterPatchpanelBindOptions();
     };
 
-    if (floorPlanSvg) {
-        floorPlanSvg.addEventListener('error', () => {
-            floorPlanSvg.removeAttribute('src');
-            floorPlanSvg.hidden = true;
-        });
-    }
-
     const loadPlanDimensions = async (svgUrl) => {
         if (!svgUrl) {
             return;
@@ -291,7 +367,9 @@ document.addEventListener('DOMContentLoaded', () => {
                 if (parts.length === 4 && parts.every((value) => Number.isFinite(value))) {
                     planSize.width = Math.max(1, parts[2]);
                     planSize.height = Math.max(1, parts[3]);
-                    updateOverlayViewBox();
+                    backgroundImage.setAttribute('width', String(planSize.width));
+                    backgroundImage.setAttribute('height', String(planSize.height));
+                    resetView();
                     renderReferenceMarkers();
                     updateFromInputs();
                     return;
@@ -307,13 +385,17 @@ document.addEventListener('DOMContentLoaded', () => {
                 planSize.width = DEFAULT_PLAN_SIZE.width;
                 planSize.height = DEFAULT_PLAN_SIZE.height;
             }
-            updateOverlayViewBox();
+            backgroundImage.setAttribute('width', String(planSize.width));
+            backgroundImage.setAttribute('height', String(planSize.height));
+            resetView();
             renderReferenceMarkers();
             updateFromInputs();
         } catch (error) {
             planSize.width = DEFAULT_PLAN_SIZE.width;
             planSize.height = DEFAULT_PLAN_SIZE.height;
-            updateOverlayViewBox();
+            backgroundImage.setAttribute('width', String(planSize.width));
+            backgroundImage.setAttribute('height', String(planSize.height));
+            resetView();
             renderReferenceMarkers();
             updateFromInputs();
         }
@@ -382,6 +464,7 @@ document.addEventListener('DOMContentLoaded', () => {
     activeMarker.addEventListener('pointerdown', (event) => {
         event.preventDefault();
         dragging = true;
+        panning = false;
         const point = toOverlayPoint(event.clientX, event.clientY);
         if (!point) {
             return;
@@ -403,12 +486,18 @@ document.addEventListener('DOMContentLoaded', () => {
     });
 
     const stopDrag = (event) => {
-        if (!dragging) {
-            return;
+        if (dragging) {
+            dragging = false;
+            if (activeMarker.hasPointerCapture(event.pointerId)) {
+                activeMarker.releasePointerCapture(event.pointerId);
+            }
         }
-        dragging = false;
-        if (activeMarker.hasPointerCapture(event.pointerId)) {
-            activeMarker.releasePointerCapture(event.pointerId);
+        if (panning) {
+            panning = false;
+            panStart = null;
+            if (overlay.hasPointerCapture(event.pointerId)) {
+                overlay.releasePointerCapture(event.pointerId);
+            }
         }
     };
 
@@ -417,6 +506,19 @@ document.addEventListener('DOMContentLoaded', () => {
     });
 
     overlay.addEventListener('pointerdown', (event) => {
+        if (event.shiftKey || event.button === 1) {
+            event.preventDefault();
+            panning = true;
+            dragging = false;
+            panStart = {
+                clientX: event.clientX,
+                clientY: event.clientY,
+                viewX,
+                viewY
+            };
+            overlay.setPointerCapture(event.pointerId);
+            return;
+        }
         if (event.target !== overlay) {
             return;
         }
@@ -427,6 +529,32 @@ document.addEventListener('DOMContentLoaded', () => {
         setMarkerPosition(point.x - markerWidth / 2, point.y - markerHeight / 2);
     });
 
+    overlay.addEventListener('pointermove', (event) => {
+        if (!panning || !panStart) {
+            return;
+        }
+        const rect = overlay.getBoundingClientRect();
+        if (rect.width <= 0 || rect.height <= 0) {
+            return;
+        }
+        const scaleX = viewWidth / rect.width;
+        const scaleY = viewHeight / rect.height;
+        const dx = (event.clientX - panStart.clientX) * scaleX;
+        const dy = (event.clientY - panStart.clientY) * scaleY;
+        viewX = panStart.viewX - dx;
+        viewY = panStart.viewY - dy;
+        applyView();
+    });
+
+    overlay.addEventListener('pointerup', stopDrag);
+    overlay.addEventListener('pointercancel', stopDrag);
+
+    overlay.addEventListener('wheel', (event) => {
+        event.preventDefault();
+        const factor = event.deltaY < 0 ? 0.9 : 1.1;
+        zoomAt(event.clientX, event.clientY, factor);
+    }, { passive: false });
+
     [xField, yField].forEach((input) => {
         input.addEventListener('input', () => {
             updateFromInputs();
@@ -466,6 +594,7 @@ document.addEventListener('DOMContentLoaded', () => {
 
     updateOverlayViewBox();
     updateFromInputs();
+    filterPatchpanelBindOptions();
 
     if (panelLocationSelect) {
         filterBuildingOptions();

app/assets/js/floor-svg-editor.js

@@ -254,6 +254,10 @@
         background.setAttribute('stroke-width', '1');
         svg.appendChild(background);
 
+        const style = createSvgElement('style');
+        style.textContent = '.floor-guide{display:none;}';
+        svg.appendChild(style);
+
         state.guides.forEach((guide) => {
             const line = createSvgElement('line');
             if (guide.orientation === 'horizontal') {

app/bootstrap.php

@@ -12,6 +12,10 @@ if (session_status() !== PHP_SESSION_ACTIVE) {
     session_start();
 }
 
+if (!isset($_SESSION['validation_errors']) || !is_array($_SESSION['validation_errors'])) {
+    $_SESSION['validation_errors'] = [];
+}
+
 require_once __DIR__ . '/lib/_sql.php';
 $sql = new SQL();
 

app/modules/buildings/save.php

@@ -25,6 +25,7 @@ if ($locationId <= 0) {
 
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirectUrl = $buildingId ? "?module=buildings&action=edit&id=$buildingId" : "?module=buildings&action=edit";
     header("Location: $redirectUrl");
     exit;

app/modules/connections/delete.php

@@ -2,12 +2,19 @@
 /**
  * app/modules/connections/delete.php
  *
- * Loescht eine Verbindung und leitet zur Liste zurueck.
+ * Loescht eine Verbindung (AJAX-POST bevorzugt, GET-Fallback fuer Redirects).
  */
 
-$connectionId = (int)($_GET['id'] ?? $_POST['id'] ?? 0);
+$isPost = ($_SERVER['REQUEST_METHOD'] ?? '') === 'POST';
+$connectionId = (int)($_POST['id'] ?? $_GET['id'] ?? 0);
 
 if ($connectionId <= 0) {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(400);
+        echo json_encode(['success' => false, 'message' => 'Ungueltige Verbindungs-ID']);
+        exit;
+    }
     $_SESSION['error'] = 'Ungueltige Verbindungs-ID';
     header('Location: ?module=connections&action=list');
     exit;
@@ -20,6 +27,12 @@ $connection = $sql->single(
 );
 
 if (!$connection) {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(404);
+        echo json_encode(['success' => false, 'message' => 'Verbindung nicht gefunden']);
+        exit;
+    }
     $_SESSION['error'] = 'Verbindung nicht gefunden';
     header('Location: ?module=connections&action=list');
     exit;
@@ -31,6 +44,17 @@ $rows = $sql->set(
     [$connectionId]
 );
 
+if ($isPost) {
+    header('Content-Type: application/json; charset=utf-8');
+    if ($rows > 0) {
+        echo json_encode(['success' => true, 'message' => 'Verbindung geloescht']);
+    } else {
+        http_response_code(500);
+        echo json_encode(['success' => false, 'message' => 'Verbindung konnte nicht geloescht werden']);
+    }
+    exit;
+}
+
 if ($rows > 0) {
     $_SESSION['success'] = 'Verbindung geloescht';
 } else {

app/modules/connections/edit.php

@@ -39,6 +39,18 @@ $portBType = $normalizePortType((string)($connection['port_b_type'] ?? 'device')
 $portAId = (int)($connection['port_a_id'] ?? 0);
 $portBId = (int)($connection['port_b_id'] ?? 0);
 
+if ($connectionId <= 0) {
+    $requestedPortAType = $normalizePortType((string)($_GET['port_a_type'] ?? $portAType));
+    $requestedPortBType = $normalizePortType((string)($_GET['port_b_type'] ?? $portBType));
+    $requestedPortAId = (int)($_GET['port_a_id'] ?? $portAId);
+    $requestedPortBId = (int)($_GET['port_b_id'] ?? $portBId);
+
+    $portAType = $requestedPortAType;
+    $portBType = $requestedPortBType;
+    $portAId = $requestedPortAId > 0 ? $requestedPortAId : 0;
+    $portBId = $requestedPortBId > 0 ? $requestedPortBId : 0;
+}
+
 $endpointOptions = [
     'device' => [],
     'module' => [],
@@ -46,7 +58,7 @@ $endpointOptions = [
     'patchpanel' => [],
 ];
 
-$occupiedByType = [
+$occupiedStatsByType = [
     'device' => [],
     'module' => [],
     'outlet' => [],
@@ -62,18 +74,24 @@ $occupiedRows = $sql->get(
 foreach ((array)$occupiedRows as $row) {
     $typeA = $normalizePortType((string)($row['port_a_type'] ?? ''));
     $idA = (int)($row['port_a_id'] ?? 0);
-    if ($idA > 0 && isset($occupiedByType[$typeA])) {
-        $occupiedByType[$typeA][$idA] = true;
+    if ($idA > 0 && isset($occupiedStatsByType[$typeA])) {
+        if (!isset($occupiedStatsByType[$typeA][$idA])) {
+            $occupiedStatsByType[$typeA][$idA] = ['total' => 0];
+        }
+        $occupiedStatsByType[$typeA][$idA]['total']++;
     }
 
     $typeB = $normalizePortType((string)($row['port_b_type'] ?? ''));
     $idB = (int)($row['port_b_id'] ?? 0);
-    if ($idB > 0 && isset($occupiedByType[$typeB])) {
-        $occupiedByType[$typeB][$idB] = true;
+    if ($idB > 0 && isset($occupiedStatsByType[$typeB])) {
+        if (!isset($occupiedStatsByType[$typeB][$idB])) {
+            $occupiedStatsByType[$typeB][$idB] = ['total' => 0];
+        }
+        $occupiedStatsByType[$typeB][$idB]['total']++;
     }
 }
 
-$isEndpointAllowed = static function (string $type, int $id) use ($occupiedByType, $portAType, $portAId, $portBType, $portBId): bool {
+$isEndpointAllowed = static function (string $type, int $id) use ($occupiedStatsByType, $portAType, $portAId, $portBType, $portBId): bool {
     if ($id <= 0) {
         return false;
     }
@@ -83,7 +101,10 @@ $isEndpointAllowed = static function (string $type, int $id) use ($occupiedByTyp
     if ($type === $portBType && $id === $portBId) {
         return true;
     }
-    return empty($occupiedByType[$type][$id]);
+
+    $stats = $occupiedStatsByType[$type][$id] ?? ['total' => 0];
+    $maxConnections = in_array($type, ['outlet', 'patchpanel'], true) ? 2 : 1;
+    return (int)($stats['total'] ?? 0) < $maxConnections;
 };
 
 // Auto-heal: ensure each outlet has at least one selectable port.
@@ -170,7 +191,14 @@ foreach ($outletPorts as $row) {
     if (!$isEndpointAllowed('outlet', $id)) {
         continue;
     }
-    $parts = array_filter([(string)($row['floor_name'] ?? ''), (string)($row['room_name'] ?? ''), (string)$row['outlet_name'], (string)$row['name']]);
+    $portName = trim((string)($row['name'] ?? ''));
+    $includePortName = ($portName !== '' && strcasecmp($portName, 'Port 1') !== 0);
+    $parts = array_filter([
+        (string)($row['floor_name'] ?? ''),
+        (string)($row['room_name'] ?? ''),
+        (string)$row['outlet_name'],
+        $includePortName ? $portName : '',
+    ]);
     $endpointOptions['outlet'][] = [
         'id' => $id,
         'label' => implode(' / ', $parts),

app/modules/connections/list.php

@@ -335,11 +335,12 @@ $buildListUrl = static function (array $extra = []) use ($search, $deviceId): st
                         <a href="<?php echo htmlspecialchars($buildListUrl(['connection_id' => $connId])); ?>" class="button button-small">Details</a>
                         <a href="?module=connections&action=edit&id=<?php echo $connId; ?>" class="button button-small">Bearbeiten</a>
                         <a href="?module=connections&action=swap&id=<?php echo $connId; ?>" class="button button-small" onclick="return confirm('Von/Nach fuer diese Verbindung vertauschen?');">Von/Nach tauschen</a>
-                        <a href="?module=connections&action=delete&id=<?php echo $connId; ?>" class="button button-small button-danger"
-                            data-confirm-delete="true"
-                            data-confirm-message="Diese Verbindung wirklich loeschen?">
+                        <button
+                            type="button"
+                            class="button button-small button-danger js-connection-delete"
+                            data-connection-id="<?php echo $connId; ?>">
                             Loeschen
-                        </a>
+                        </button>
                     </td>
                 </tr>
                 <?php endforeach; ?>
@@ -382,7 +383,12 @@ $buildListUrl = static function (array $extra = []) use ($search, $deviceId): st
                 <div class="sidebar-actions">
                     <a href="?module=connections&action=edit&id=<?php echo $selectedConnId; ?>" class="button button-small">Bearbeiten</a>
                     <a href="?module=connections&action=swap&id=<?php echo $selectedConnId; ?>" class="button button-small" onclick="return confirm('Von/Nach fuer diese Verbindung vertauschen?');">Tauschen</a>
-                    <a href="?module=connections&action=delete&id=<?php echo $selectedConnId; ?>" class="button button-small button-danger" data-confirm-delete="true" data-confirm-message="Diese Verbindung wirklich loeschen?">Loeschen</a>
+                    <button
+                        type="button"
+                        class="button button-small button-danger js-connection-delete"
+                        data-connection-id="<?php echo $selectedConnId; ?>">
+                        Loeschen
+                    </button>
                 </div>
             <?php else: ?>
                 <p><em>Keine Verbindung ausgewaehlt.</em></p>
@@ -420,57 +426,34 @@ $buildListUrl = static function (array $extra = []) use ($search, $deviceId): st
     </aside>
 </div>
 
-<style>
-.connections-layout {
-    display: grid;
-    grid-template-columns: minmax(0, 1fr) 320px;
-    gap: 20px;
-    align-items: start;
-}
+<script>
+document.addEventListener('DOMContentLoaded', () => {
+    document.querySelectorAll('.js-connection-delete').forEach((button) => {
+        button.addEventListener('click', () => {
+            const id = Number(button.dataset.connectionId || '0');
+            if (id <= 0) {
+                return;
+            }
 
-.connections-sidebar {
-    position: sticky;
-    top: 92px;
-    display: grid;
-    gap: 12px;
-}
+            if (!confirm('Diese Verbindung wirklich loeschen?')) {
+                return;
+            }
 
-.sidebar-card {
-    background: #fff;
-    border: 1px solid #e0e6ef;
-    border-radius: 12px;
-    padding: 14px;
-    box-shadow: 0 8px 24px rgba(15, 26, 45, 0.08);
-}
-
-.sidebar-card h3,
-.sidebar-card h4 {
-    margin: 0 0 10px;
-}
-
-.sidebar-card p {
-    margin: 0 0 8px;
-}
-
-.sidebar-actions {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 8px;
-    margin-top: 10px;
-}
-
-.connection-row-selected {
-    background: #edf5ff;
-}
-
-@media (max-width: 1100px) {
-    .connections-layout {
-        grid-template-columns: 1fr;
-    }
-
-    .connections-sidebar {
-        position: static;
-        grid-template-columns: 1fr;
-    }
-}
-</style>
+            fetch('?module=connections&action=delete', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
+                body: 'id=' + encodeURIComponent(id)
+            })
+                .then((response) => response.json())
+                .then((data) => {
+                    if (data && data.success) {
+                        window.location.reload();
+                        return;
+                    }
+                    alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
+                })
+                .catch(() => alert('Loeschen fehlgeschlagen'));
+        });
+    });
+});
+</script>

app/modules/connections/save.php

@@ -42,6 +42,18 @@ $normalizePortType = static function (string $value): string {
 $portAType = $normalizePortType((string)$portAType);
 $portBType = $normalizePortType((string)$portBType);
 
+$isTopologyPairAllowed = static function (string $typeA, string $typeB): bool {
+    $allowed = ['device' => true, 'module' => true, 'outlet' => true, 'patchpanel' => true];
+    if (!isset($allowed[$typeA]) || !isset($allowed[$typeB])) {
+        return false;
+    }
+    if ($typeA === 'patchpanel' || $typeB === 'patchpanel') {
+        return ($typeA === 'patchpanel' && in_array($typeB, ['patchpanel', 'outlet'], true))
+            || ($typeB === 'patchpanel' && in_array($typeA, ['patchpanel', 'outlet'], true));
+    }
+    return true;
+};
+
 // =========================
 // Validierung (einfach)
 // =========================
@@ -50,6 +62,9 @@ $errors = [];
 if ($portAId <= 0 || $portBId <= 0) {
     $errors[] = "Beide Ports sind erforderlich";
 }
+if (!$isTopologyPairAllowed($portAType, $portBType)) {
+    $errors[] = "Patchpanel-Ports duerfen nur mit Patchpanel-Ports oder Netzwerkdosen-Ports verbunden werden";
+}
 
 $otherConnections = $sql->get(
     "SELECT id, port_a_type, port_a_id, port_b_type, port_b_id
@@ -59,35 +74,78 @@ $otherConnections = $sql->get(
     [$connId]
 );
 
-$isEndpointUsed = static function (string $endpointType, int $endpointId) use ($otherConnections, $normalizePortType): bool {
+$endpointUsage = [];
+$trackUsage = static function (string $endpointType, int $endpointId, string $otherType) use (&$endpointUsage): void {
     if ($endpointId <= 0) {
-        return false;
+        return;
     }
-    foreach ((array)$otherConnections as $row) {
-        $typeA = $normalizePortType((string)($row['port_a_type'] ?? ''));
-        $idA = (int)($row['port_a_id'] ?? 0);
-        if ($typeA === $endpointType && $idA === $endpointId) {
-            return true;
-        }
+    if (!isset($endpointUsage[$endpointType][$endpointId])) {
+        $endpointUsage[$endpointType][$endpointId] = [
+            'total' => 0,
+            'fixed' => 0,
+            'patch' => 0,
+        ];
+    }
+    $endpointUsage[$endpointType][$endpointId]['total']++;
 
-        $typeB = $normalizePortType((string)($row['port_b_type'] ?? ''));
-        $idB = (int)($row['port_b_id'] ?? 0);
-        if ($typeB === $endpointType && $idB === $endpointId) {
-            return true;
+    if (in_array($endpointType, ['outlet', 'patchpanel'], true)) {
+        if (in_array($otherType, ['outlet', 'patchpanel'], true)) {
+            $endpointUsage[$endpointType][$endpointId]['fixed']++;
+        } elseif (in_array($otherType, ['device', 'module'], true)) {
+            $endpointUsage[$endpointType][$endpointId]['patch']++;
         }
     }
-    return false;
 };
 
-if ($isEndpointUsed($portAType, $portAId)) {
-    $errors[] = "Port an Endpunkt A ist bereits in Verwendung";
+foreach ((array)$otherConnections as $row) {
+    $typeA = $normalizePortType((string)($row['port_a_type'] ?? ''));
+    $typeB = $normalizePortType((string)($row['port_b_type'] ?? ''));
+    $idA = (int)($row['port_a_id'] ?? 0);
+    $idB = (int)($row['port_b_id'] ?? 0);
+
+    $trackUsage($typeA, $idA, $typeB);
+    $trackUsage($typeB, $idB, $typeA);
 }
-if ($isEndpointUsed($portBType, $portBId)) {
-    $errors[] = "Port an Endpunkt B ist bereits in Verwendung";
+
+$validateEndpointUsage = static function (string $endpointType, int $endpointId, string $otherType, string $label) use ($endpointUsage): ?string {
+    if ($endpointId <= 0) {
+        return null;
+    }
+
+    $stats = $endpointUsage[$endpointType][$endpointId] ?? ['total' => 0, 'fixed' => 0, 'patch' => 0];
+    if ((int)$stats['total'] <= 0) {
+        return null;
+    }
+
+    if (in_array($endpointType, ['outlet', 'patchpanel'], true)) {
+        if ((int)$stats['total'] >= 2) {
+            return $label . " hat bereits die maximale Anzahl von 2 Verbindungen";
+        }
+        if (in_array($otherType, ['outlet', 'patchpanel'], true) && (int)$stats['fixed'] >= 1) {
+            return $label . " hat bereits eine feste Verdrahtung";
+        }
+        if (in_array($otherType, ['device', 'module'], true) && (int)$stats['patch'] >= 1) {
+            return $label . " hat bereits ein Patchkabel";
+        }
+        return null;
+    }
+
+    return $label . " ist bereits in Verwendung";
+};
+
+$errorA = $validateEndpointUsage($portAType, $portAId, $portBType, 'Port an Endpunkt A');
+if ($errorA !== null) {
+    $errors[] = $errorA;
+}
+
+$errorB = $validateEndpointUsage($portBType, $portBId, $portAType, 'Port an Endpunkt B');
+if ($errorB !== null) {
+    $errors[] = $errorB;
 }
 
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirectUrl = $connId ? "?module=connections&action=edit&id=$connId" : "?module=connections&action=edit";
     header("Location: $redirectUrl");
     exit;
@@ -123,6 +181,7 @@ if ($connId > 0) {
 
     if ($connectionTypeId <= 0) {
         $_SESSION['error'] = "Kein Verbindungstyp verfuegbar";
+        $_SESSION['validation_errors'] = ["Kein Verbindungstyp verfuegbar"];
         header("Location: ?module=connections&action=edit");
         exit;
     }

app/modules/dashboard/list.php

@@ -31,12 +31,18 @@ $topologyDevices = $sql->get(
         r.id AS rack_id,
         r.name AS rack_name,
         f.id AS floor_id,
-        f.name AS floor_name
+        f.name AS floor_name,
+        b.id AS building_id,
+        b.name AS building_name,
+        l.id AS location_id,
+        l.name AS location_name
      FROM devices d
      LEFT JOIN device_types dt ON dt.id = d.device_type_id
      LEFT JOIN racks r ON r.id = d.rack_id
      LEFT JOIN floors f ON f.id = r.floor_id
-     ORDER BY floor_name, rack_name, device_name",
+     LEFT JOIN buildings b ON b.id = f.building_id
+     LEFT JOIN locations l ON l.id = b.location_id
+     ORDER BY location_name, building_name, floor_name, rack_name, device_name",
     "",
     []
 );
@@ -50,8 +56,195 @@ $topologyPayload = array_map(static function (array $row): array {
         'rack_name' => (string)($row['rack_name'] ?? ''),
         'floor_id' => (int)($row['floor_id'] ?? 0),
         'floor_name' => (string)($row['floor_name'] ?? ''),
+        'building_id' => (int)($row['building_id'] ?? 0),
+        'building_name' => (string)($row['building_name'] ?? ''),
+        'location_id' => (int)($row['location_id'] ?? 0),
+        'location_name' => (string)($row['location_name'] ?? ''),
     ];
 }, $topologyDevices);
+
+$devicePortCountByDevice = [];
+foreach ($sql->get(
+    "SELECT device_id, COUNT(*) AS cnt
+     FROM device_ports
+     GROUP BY device_id",
+    "",
+    []
+) as $row) {
+    $deviceId = (int)($row['device_id'] ?? 0);
+    if ($deviceId <= 0) {
+        continue;
+    }
+    $devicePortCountByDevice[$deviceId] = (int)($row['cnt'] ?? 0);
+}
+
+$devicePortPreviewByDevice = [];
+$connectedDevicePorts = [];
+foreach ($sql->get(
+    "SELECT port_a_type, port_a_id, port_b_type, port_b_id
+     FROM connections",
+    "",
+    []
+) as $row) {
+    $portAType = strtolower(trim((string)($row['port_a_type'] ?? '')));
+    $portBType = strtolower(trim((string)($row['port_b_type'] ?? '')));
+    $portAId = (int)($row['port_a_id'] ?? 0);
+    $portBId = (int)($row['port_b_id'] ?? 0);
+
+    if (($portAType === 'device' || $portAType === 'device_ports') && $portAId > 0) {
+        $connectedDevicePorts[$portAId] = true;
+    }
+    if (($portBType === 'device' || $portBType === 'device_ports') && $portBId > 0) {
+        $connectedDevicePorts[$portBId] = true;
+    }
+}
+
+foreach ($sql->get(
+    "SELECT id, device_id, name
+     FROM device_ports
+     ORDER BY device_id, id",
+    "",
+    []
+) as $row) {
+    $deviceId = (int)($row['device_id'] ?? 0);
+    if ($deviceId <= 0) {
+        continue;
+    }
+    if (!isset($devicePortPreviewByDevice[$deviceId])) {
+        $devicePortPreviewByDevice[$deviceId] = [];
+    }
+    if (count($devicePortPreviewByDevice[$deviceId]) >= 4) {
+        continue;
+    }
+    $devicePortPreviewByDevice[$deviceId][] = [
+        'id' => (int)($row['id'] ?? 0),
+        'name' => (string)($row['name'] ?? ''),
+        'is_connected' => isset($connectedDevicePorts[(int)($row['id'] ?? 0)]),
+    ];
+}
+
+foreach ($topologyPayload as $idx => $entry) {
+    $deviceId = (int)($entry['device_id'] ?? 0);
+    $topologyPayload[$idx]['port_count'] = (int)($devicePortCountByDevice[$deviceId] ?? 0);
+    $topologyPayload[$idx]['port_preview'] = $devicePortPreviewByDevice[$deviceId] ?? [];
+}
+
+$rackInfoRows = $sql->get(
+    "SELECT
+        r.id AS rack_id,
+        r.name AS rack_name,
+        f.id AS floor_id,
+        f.name AS floor_name,
+        b.id AS building_id,
+        b.name AS building_name,
+        l.id AS location_id,
+        l.name AS location_name
+     FROM racks r
+     LEFT JOIN floors f ON f.id = r.floor_id
+     LEFT JOIN buildings b ON b.id = f.building_id
+     LEFT JOIN locations l ON l.id = b.location_id",
+    "",
+    []
+);
+
+$rackInfoById = [];
+foreach ($rackInfoRows as $row) {
+    $rackId = (int)($row['rack_id'] ?? 0);
+    if ($rackId <= 0) {
+        continue;
+    }
+    $rackInfoById[$rackId] = [
+        'rack_id' => $rackId,
+        'rack_name' => (string)($row['rack_name'] ?? ''),
+        'floor_id' => (int)($row['floor_id'] ?? 0),
+        'floor_name' => (string)($row['floor_name'] ?? ''),
+        'building_id' => (int)($row['building_id'] ?? 0),
+        'building_name' => (string)($row['building_name'] ?? ''),
+        'location_id' => (int)($row['location_id'] ?? 0),
+        'location_name' => (string)($row['location_name'] ?? ''),
+    ];
+}
+
+$devicePortRacks = [];
+foreach ($sql->get(
+    "SELECT dp.id AS port_id, d.rack_id
+     FROM device_ports dp
+     JOIN devices d ON d.id = dp.device_id
+     WHERE d.rack_id IS NOT NULL",
+    "",
+    []
+) as $row) {
+    $devicePortRacks[(int)$row['port_id']] = (int)$row['rack_id'];
+}
+
+$modulePortRacks = [];
+foreach ($sql->get(
+    "SELECT mp.id AS port_id, d.rack_id
+     FROM module_ports mp
+     JOIN modules m ON m.id = mp.module_id
+     JOIN device_port_modules dpm ON dpm.module_id = m.id
+     JOIN device_ports dp ON dp.id = dpm.device_port_id
+     JOIN devices d ON d.id = dp.device_id
+     WHERE d.rack_id IS NOT NULL",
+    "",
+    []
+) as $row) {
+    $modulePortRacks[(int)$row['port_id']] = (int)$row['rack_id'];
+}
+
+$resolveRackId = static function (string $endpointType, int $endpointId) use ($devicePortRacks, $modulePortRacks): int {
+    if ($endpointType === 'device') {
+        return (int)($devicePortRacks[$endpointId] ?? 0);
+    }
+    if ($endpointType === 'module') {
+        return (int)($modulePortRacks[$endpointId] ?? 0);
+    }
+    return 0;
+};
+
+$rackLinksByKey = [];
+foreach ($sql->get(
+    "SELECT id, port_a_type, port_a_id, port_b_type, port_b_id
+     FROM connections",
+    "",
+    []
+) as $row) {
+    $rackA = $resolveRackId((string)($row['port_a_type'] ?? ''), (int)($row['port_a_id'] ?? 0));
+    $rackB = $resolveRackId((string)($row['port_b_type'] ?? ''), (int)($row['port_b_id'] ?? 0));
+    if ($rackA <= 0 || $rackB <= 0 || $rackA === $rackB) {
+        continue;
+    }
+
+    $from = min($rackA, $rackB);
+    $to = max($rackA, $rackB);
+    $key = $from . ':' . $to;
+    if (!isset($rackLinksByKey[$key])) {
+        $rackLinksByKey[$key] = [
+            'from_rack_id' => $from,
+            'to_rack_id' => $to,
+            'count' => 0,
+            'sample_connection_id' => (int)($row['id'] ?? 0)
+        ];
+    }
+    $rackLinksByKey[$key]['count']++;
+}
+
+$rackLinkPayload = [];
+foreach ($rackLinksByKey as $entry) {
+    $fromId = (int)$entry['from_rack_id'];
+    $toId = (int)$entry['to_rack_id'];
+    $fromMeta = $rackInfoById[$fromId] ?? ['rack_name' => 'Rack #' . $fromId];
+    $toMeta = $rackInfoById[$toId] ?? ['rack_name' => 'Rack #' . $toId];
+
+    $rackLinkPayload[] = [
+        'from_rack_id' => $fromId,
+        'to_rack_id' => $toId,
+        'count' => (int)$entry['count'],
+        'from_rack_name' => (string)($fromMeta['rack_name'] ?? ('Rack #' . $fromId)),
+        'to_rack_name' => (string)($toMeta['rack_name'] ?? ('Rack #' . $toId)),
+        'sample_connection_id' => (int)($entry['sample_connection_id'] ?? 0),
+    ];
+}
 ?>
 
 <div class="dashboard">
@@ -70,11 +263,12 @@ $topologyPayload = array_map(static function (array $row): array {
                 <button type="button" class="button button-small" data-topology-zoom="reset">Reset</button>
             </div>
         </div>
-        <p class="topology-wall__hint">Mausrad zoomt, Ziehen verschiebt. Klick auf einen Punkt zoomt auf den Rack-Kontext und oeffnet die Detailkarte.</p>
+        <p class="topology-wall__hint">Hierarchie: Standort → Gebaeude → Stockwerk → Rack → Geraet. Linien zeigen Rack-Verbindungen (dicker = mehr Links).</p>
 
         <svg id="dashboard-topology-svg" viewBox="0 0 2400 1400" role="img" aria-label="Topologie-Wand">
-            <rect x="0" y="0" width="2400" height="1400" class="topology-bg"></rect>
+            <rect id="dashboard-topology-bg" x="0" y="0" width="2400" height="1400" class="topology-bg" fill="#f7faff"></rect>
             <g id="dashboard-topology-grid"></g>
+            <g id="dashboard-topology-connections"></g>
             <g id="dashboard-topology-layer"></g>
         </svg>
 
@@ -88,6 +282,7 @@ $topologyPayload = array_map(static function (array $row): array {
             <p data-topology-meta></p>
             <p data-topology-rack-link></p>
             <p data-topology-device-link></p>
+            <div class="topology-overlay__actions" data-topology-actions></div>
         </aside>
     </section>
 
@@ -147,6 +342,7 @@ $topologyPayload = array_map(static function (array $row): array {
 </div>
 
 <script id="dashboard-topology-data" type="application/json"><?php echo json_encode($topologyPayload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES); ?></script>
+<script id="dashboard-topology-links" type="application/json"><?php echo json_encode($rackLinkPayload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES); ?></script>
 <script>
 (function () {
     const root = document.getElementById('dashboard-topology-wall');
@@ -155,7 +351,9 @@ $topologyPayload = array_map(static function (array $row): array {
     }
 
     const svg = document.getElementById('dashboard-topology-svg');
+    const bgNode = document.getElementById('dashboard-topology-bg');
     const gridLayer = document.getElementById('dashboard-topology-grid');
+    const connectionLayer = document.getElementById('dashboard-topology-connections');
     const nodeLayer = document.getElementById('dashboard-topology-layer');
     const emptyNode = document.getElementById('dashboard-topology-empty');
     const overlay = document.getElementById('dashboard-topology-overlay');
@@ -163,20 +361,37 @@ $topologyPayload = array_map(static function (array $row): array {
     const overlayMeta = overlay ? overlay.querySelector('[data-topology-meta]') : null;
     const overlayRackLink = overlay ? overlay.querySelector('[data-topology-rack-link]') : null;
     const overlayDeviceLink = overlay ? overlay.querySelector('[data-topology-device-link]') : null;
+    const overlayActions = overlay ? overlay.querySelector('[data-topology-actions]') : null;
     const closeButton = overlay ? overlay.querySelector('[data-topology-close]') : null;
 
     const dataTag = document.getElementById('dashboard-topology-data');
+    const linkTag = document.getElementById('dashboard-topology-links');
     let nodes = [];
+    let rackLinks = [];
     try {
         nodes = JSON.parse((dataTag && dataTag.textContent) || '[]');
     } catch (error) {
         nodes = [];
     }
+    try {
+        rackLinks = JSON.parse((linkTag && linkTag.textContent) || '[]');
+    } catch (error) {
+        rackLinks = [];
+    }
 
     const scene = { width: 2400, height: 1400 };
     let view = { x: 0, y: 0, width: scene.width, height: scene.height };
     let drag = null;
 
+    function clearActiveSelections() {
+        nodeLayer.querySelectorAll('.topology-node.active, .topology-port-node.active').forEach((node) => {
+            node.classList.remove('active');
+        });
+        connectionLayer.querySelectorAll('.topology-connection-line.active').forEach((line) => {
+            line.classList.remove('active');
+        });
+    }
+
     function clampView() {
         view.width = Math.max(220, Math.min(scene.width, view.width));
         view.height = Math.max(180, Math.min(scene.height, view.height));
@@ -261,107 +476,248 @@ $topologyPayload = array_map(static function (array $row): array {
     }
 
     function buildLayout(data) {
-        const floors = new Map();
+        const hierarchy = new Map();
 
         data.forEach((entry) => {
+            const locationId = Number(entry.location_id || 0);
+            const locationName = (entry.location_name || '').trim() || 'Ohne Standort';
+            const buildingId = Number(entry.building_id || 0);
+            const buildingName = (entry.building_name || '').trim() || 'Ohne Gebaeude';
+            const floorId = Number(entry.floor_id || 0);
             const floorName = (entry.floor_name || '').trim() || 'Ohne Stockwerk';
             const rackId = Number(entry.rack_id || 0);
             const rackName = (entry.rack_name || '').trim() || 'Ohne Rack';
+
+            const locationKey = `${locationId}:${locationName}`;
+            const buildingKey = `${buildingId}:${buildingName}`;
+            const floorKey = `${floorId}:${floorName}`;
             const rackKey = `${rackId}:${rackName}`;
 
-            if (!floors.has(floorName)) {
-                floors.set(floorName, new Map());
+            if (!hierarchy.has(locationKey)) {
+                hierarchy.set(locationKey, new Map());
             }
-            const racks = floors.get(floorName);
+            const buildings = hierarchy.get(locationKey);
+            if (!buildings.has(buildingKey)) {
+                buildings.set(buildingKey, new Map());
+            }
+            const floors = buildings.get(buildingKey);
+            if (!floors.has(floorKey)) {
+                floors.set(floorKey, new Map());
+            }
+            const racks = floors.get(floorKey);
             if (!racks.has(rackKey)) {
                 racks.set(rackKey, []);
             }
             racks.get(rackKey).push(entry);
         });
 
-        const floorNames = Array.from(floors.keys()).sort((a, b) => a.localeCompare(b));
         const positioned = [];
+        const rackCenters = new Map();
+        let maxY = 1400;
+        let locationIndex = 0;
 
-        floorNames.forEach((floorName, floorIndex) => {
-            const rackMap = floors.get(floorName);
-            const rackKeys = Array.from(rackMap.keys()).sort((a, b) => a.localeCompare(b));
-            const floorX = 140 + floorIndex * 540;
+        const locationKeys = Array.from(hierarchy.keys()).sort((a, b) => a.localeCompare(b));
+        locationKeys.forEach((locationKey) => {
+            const locationName = locationKey.split(':').slice(1).join(':');
+            const locationX = 120 + locationIndex * 760;
+            const buildings = hierarchy.get(locationKey);
+            const buildingKeys = Array.from(buildings.keys()).sort((a, b) => a.localeCompare(b));
+            let currentY = 110;
+            const locationTop = currentY - 46;
 
-            positioned.push({ type: 'floor-label', x: floorX, y: 70, label: floorName });
+            positioned.push({
+                type: 'location-label',
+                x: locationX,
+                y: 70,
+                label: locationName
+            });
 
-            rackKeys.forEach((rackKey, rackIndex) => {
-                const devices = rackMap.get(rackKey);
-                const [rackIdPart, rackNamePart] = rackKey.split(':');
-                const rackId = Number(rackIdPart || 0);
-                const rackName = rackNamePart || 'Ohne Rack';
-
-                const rackTop = 120 + rackIndex * 180;
-                const rowCount = Math.ceil(Math.max(1, devices.length) / 4);
-                const rackHeight = Math.max(90, 40 + rowCount * 45);
+            buildingKeys.forEach((buildingKey) => {
+                const buildingName = buildingKey.split(':').slice(1).join(':');
+                const floors = buildings.get(buildingKey);
+                const floorKeys = Array.from(floors.keys()).sort((a, b) => a.localeCompare(b));
+                const buildingTop = currentY;
 
                 positioned.push({
-                    type: 'rack-box',
-                    x: floorX - 50,
-                    y: rackTop - 30,
-                    width: 380,
-                    height: rackHeight,
-                    label: rackName,
-                    rack_id: rackId
+                    type: 'building-label',
+                    x: locationX + 18,
+                    y: buildingTop + 24,
+                    label: buildingName
                 });
 
-                devices.forEach((device, deviceIndex) => {
-                    const col = deviceIndex % 4;
-                    const row = Math.floor(deviceIndex / 4);
-                    const x = floorX + col * 85;
-                    const y = rackTop + row * 40;
+                let floorCursorY = buildingTop + 32;
+                floorKeys.forEach((floorKey) => {
+                    const floorName = floorKey.split(':').slice(1).join(':');
+                    const racks = floors.get(floorKey);
+                    const rackKeys = Array.from(racks.keys()).sort((a, b) => a.localeCompare(b));
+                    const floorTop = floorCursorY;
+                    let rackCursorY = floorTop + 36;
 
                     positioned.push({
-                        type: 'node',
-                        x,
-                        y,
-                        rack_id: Number(device.rack_id || 0),
-                        rack_name: device.rack_name || 'Ohne Rack',
-                        floor_name: device.floor_name || 'Ohne Stockwerk',
-                        device_id: Number(device.device_id || 0),
-                        device_name: device.device_name || 'Unbenannt',
-                        device_type_name: device.device_type_name || ''
+                        type: 'floor-label',
+                        x: locationX + 28,
+                        y: floorTop + 22,
+                        label: floorName
                     });
+
+                    rackKeys.forEach((rackKey) => {
+                        const devices = racks.get(rackKey);
+                        const [rackIdPart, ...rackNameParts] = rackKey.split(':');
+                        const rackId = Number(rackIdPart || 0);
+                        const rackName = rackNameParts.join(':') || 'Ohne Rack';
+                        const rowCount = Math.ceil(Math.max(1, devices.length) / 6);
+                        const rackHeight = Math.max(78, 28 + rowCount * 30);
+                        const rackX = locationX + 40;
+
+                        positioned.push({
+                            type: 'rack-box',
+                            x: rackX,
+                            y: rackCursorY,
+                            width: 640,
+                            height: rackHeight,
+                            label: rackName,
+                            rack_id: rackId
+                        });
+
+                        if (rackId > 0) {
+                            rackCenters.set(rackId, {
+                                x: rackX + 320,
+                                y: rackCursorY + rackHeight / 2
+                            });
+                        }
+
+                        devices.forEach((device, deviceIndex) => {
+                            const col = deviceIndex % 6;
+                            const row = Math.floor(deviceIndex / 6);
+                            const x = rackX + 24 + col * 96;
+                            const y = rackCursorY + 28 + row * 30;
+
+                            positioned.push({
+                                type: 'node',
+                                x,
+                                y,
+                                rack_id: Number(device.rack_id || 0),
+                                rack_name: device.rack_name || 'Ohne Rack',
+                                floor_name: device.floor_name || 'Ohne Stockwerk',
+                                building_name: device.building_name || 'Ohne Gebaeude',
+                                location_name: device.location_name || 'Ohne Standort',
+                                device_id: Number(device.device_id || 0),
+                                device_name: device.device_name || 'Unbenannt',
+                                device_type_name: device.device_type_name || '',
+                                port_count: Number(device.port_count || 0),
+                                port_preview: Array.isArray(device.port_preview) ? device.port_preview : []
+                            });
+                        });
+
+                        rackCursorY += rackHeight + 16;
+                    });
+
+                    const floorHeight = Math.max(84, rackCursorY - floorTop + 8);
+                    positioned.push({
+                        type: 'floor-box',
+                        x: locationX + 20,
+                        y: floorTop,
+                        width: 680,
+                        height: floorHeight
+                    });
+
+                    floorCursorY = floorTop + floorHeight + 18;
                 });
+
+                const buildingHeight = Math.max(130, floorCursorY - buildingTop + 8);
+                positioned.push({
+                    type: 'building-box',
+                    x: locationX + 8,
+                    y: buildingTop,
+                    width: 708,
+                    height: buildingHeight
+                });
+
+                currentY = buildingTop + buildingHeight + 26;
             });
+
+            const locationHeight = Math.max(220, currentY - locationTop + 16);
+            positioned.push({
+                type: 'location-box',
+                x: locationX - 8,
+                y: locationTop,
+                width: 736,
+                height: locationHeight
+            });
+
+            maxY = Math.max(maxY, locationTop + locationHeight + 40);
+            locationIndex++;
         });
 
-        return positioned;
+        const width = Math.max(2400, 220 + locationIndex * 760);
+        const height = Math.max(1400, Math.ceil(maxY));
+        return { entries: positioned, rackCenters, width, height };
     }
 
-    function showOverlay(node) {
-        if (!overlay || !overlayTitle || !overlayMeta || !overlayRackLink || !overlayDeviceLink) {
+    function showOverlay(item) {
+        if (!overlay || !overlayTitle || !overlayMeta || !overlayRackLink || !overlayDeviceLink || !overlayActions) {
             return;
         }
 
-        overlayTitle.textContent = node.rack_name || 'Ohne Rack';
-        const typeLabel = node.device_type_name ? ` (${node.device_type_name})` : '';
-        overlayMeta.textContent = `Stockwerk: ${node.floor_name} | Geraet: ${node.device_name}${typeLabel}`;
+        overlayRackLink.textContent = '';
+        overlayDeviceLink.textContent = '';
+        overlayActions.innerHTML = '';
 
-        if (node.rack_id > 0) {
-            overlayRackLink.innerHTML = `<a href="?module=racks&action=edit&id=${node.rack_id}">Rack bearbeiten</a>`;
+        if (item.kind === 'connection') {
+            overlayTitle.textContent = 'Verbindung';
+            overlayMeta.textContent = `${item.from_name} <-> ${item.to_name} | Anzahl: ${item.count}`;
+            if (item.sample_connection_id > 0) {
+                overlayRackLink.innerHTML = `<a href="?module=connections&action=edit&id=${item.sample_connection_id}">Verbindung bearbeiten</a>`;
+                overlayDeviceLink.innerHTML = `<a href="?module=connections&action=delete&id=${item.sample_connection_id}" onclick="return confirm('Diese Verbindung wirklich loeschen?');">Verbindung entfernen</a>`;
+            }
+            overlay.hidden = false;
+            return;
+        }
+
+        if (item.kind === 'port') {
+            overlayTitle.textContent = `Port: ${item.port_name}`;
+            overlayMeta.textContent = `Geraet: ${item.device_name} | Rack: ${item.rack_name} | Stockwerk: ${item.floor_name}`;
+            if (item.device_id > 0) {
+                overlayRackLink.innerHTML = `<a href="?module=devices&action=edit&id=${item.device_id}">Geraet bearbeiten</a>`;
+                if (item.port_id > 0 && !item.is_connected) {
+                    overlayDeviceLink.innerHTML = `<a href="?module=connections&action=edit&port_a_type=device&port_a_id=${item.port_id}&port_b_type=patchpanel">Mit Patchfeld verbinden</a>`;
+                } else {
+                    overlayDeviceLink.textContent = 'Port ist bereits verbunden';
+                }
+            }
+            if (item.port_id > 0) {
+                overlayActions.innerHTML = `<a class="button button-small" href="?module=devices&action=edit&id=${item.device_id}">Port im Geraet aendern</a>`;
+            }
+            overlay.hidden = false;
+            return;
+        }
+
+        overlayTitle.textContent = item.rack_name || 'Ohne Rack';
+        const typeLabel = item.device_type_name ? ` (${item.device_type_name})` : '';
+        overlayMeta.textContent = `Standort: ${item.location_name} | Gebaeude: ${item.building_name} | Stockwerk: ${item.floor_name} | Geraet: ${item.device_name}${typeLabel}`;
+
+        if (item.rack_id > 0) {
+            overlayRackLink.innerHTML = `<a href="?module=racks&action=edit&id=${item.rack_id}">Rack bearbeiten</a>`;
         } else {
             overlayRackLink.textContent = 'Kein Rack verknuepft';
         }
 
-        if (node.device_id > 0) {
-            overlayDeviceLink.innerHTML = `<a href="?module=devices&action=edit&id=${node.device_id}">Geraet bearbeiten</a>`;
-        } else {
-            overlayDeviceLink.textContent = '';
+        if (item.device_id > 0) {
+            overlayDeviceLink.innerHTML = `<a href="?module=devices&action=edit&id=${item.device_id}">Geraet bearbeiten</a>`;
+            overlayActions.innerHTML = `
+                <a class="button button-small" href="?module=devices&action=edit&id=${item.device_id}">Editieren</a>
+                <a class="button button-small button-danger" href="?module=devices&action=delete&id=${item.device_id}&force=1" onclick="return confirm('Dieses Geraet wirklich loeschen?');">Entfernen</a>
+            `;
         }
 
         overlay.hidden = false;
     }
 
     function renderTopology() {
-        drawGrid();
-        clearLayer(nodeLayer);
-
         if (!nodes.length) {
+            drawGrid();
+            clearLayer(connectionLayer);
+            clearLayer(nodeLayer);
             if (emptyNode) {
                 emptyNode.hidden = false;
             }
@@ -372,9 +728,75 @@ $topologyPayload = array_map(static function (array $row): array {
             emptyNode.hidden = true;
         }
 
-        const entries = buildLayout(nodes);
+        const layout = buildLayout(nodes);
+        const entries = layout.entries;
+        scene.width = layout.width;
+        scene.height = layout.height;
+        drawGrid();
+        clearLayer(connectionLayer);
+        clearLayer(nodeLayer);
+        if (bgNode) {
+            bgNode.setAttribute('width', String(scene.width));
+            bgNode.setAttribute('height', String(scene.height));
+        }
 
         entries.forEach((entry) => {
+            if (entry.type === 'location-box') {
+                const rect = svgElement('rect');
+                rect.setAttribute('x', String(entry.x));
+                rect.setAttribute('y', String(entry.y));
+                rect.setAttribute('width', String(entry.width));
+                rect.setAttribute('height', String(entry.height));
+                rect.setAttribute('rx', '12');
+                rect.setAttribute('class', 'topology-location-box');
+                nodeLayer.appendChild(rect);
+                return;
+            }
+
+            if (entry.type === 'building-box') {
+                const rect = svgElement('rect');
+                rect.setAttribute('x', String(entry.x));
+                rect.setAttribute('y', String(entry.y));
+                rect.setAttribute('width', String(entry.width));
+                rect.setAttribute('height', String(entry.height));
+                rect.setAttribute('rx', '10');
+                rect.setAttribute('class', 'topology-building-box');
+                nodeLayer.appendChild(rect);
+                return;
+            }
+
+            if (entry.type === 'floor-box') {
+                const rect = svgElement('rect');
+                rect.setAttribute('x', String(entry.x));
+                rect.setAttribute('y', String(entry.y));
+                rect.setAttribute('width', String(entry.width));
+                rect.setAttribute('height', String(entry.height));
+                rect.setAttribute('rx', '8');
+                rect.setAttribute('class', 'topology-floor-box');
+                nodeLayer.appendChild(rect);
+                return;
+            }
+
+            if (entry.type === 'location-label') {
+                const text = svgElement('text');
+                text.setAttribute('x', String(entry.x));
+                text.setAttribute('y', String(entry.y));
+                text.setAttribute('class', 'topology-location-label');
+                text.textContent = entry.label;
+                nodeLayer.appendChild(text);
+                return;
+            }
+
+            if (entry.type === 'building-label') {
+                const text = svgElement('text');
+                text.setAttribute('x', String(entry.x));
+                text.setAttribute('y', String(entry.y));
+                text.setAttribute('class', 'topology-building-label');
+                text.textContent = entry.label;
+                nodeLayer.appendChild(text);
+                return;
+            }
+
             if (entry.type === 'floor-label') {
                 const text = svgElement('text');
                 text.setAttribute('x', String(entry.x));
@@ -418,12 +840,10 @@ $topologyPayload = array_map(static function (array $row): array {
             circle.appendChild(title);
 
             const activate = () => {
-                nodeLayer.querySelectorAll('.topology-node.active').forEach((node) => {
-                    node.classList.remove('active');
-                });
+                clearActiveSelections();
                 circle.classList.add('active');
                 zoomToNode(entry.x, entry.y);
-                showOverlay(entry);
+                showOverlay({ ...entry, kind: 'device' });
             };
 
             circle.addEventListener('click', activate);
@@ -435,6 +855,92 @@ $topologyPayload = array_map(static function (array $row): array {
             });
 
             nodeLayer.appendChild(circle);
+
+            const portPreview = Array.isArray(entry.port_preview) ? entry.port_preview : [];
+            portPreview.forEach((port, portIndex) => {
+                const portNode = svgElement('circle');
+                portNode.setAttribute('cx', String(entry.x + 16 + (portIndex * 10)));
+                portNode.setAttribute('cy', String(entry.y - 16));
+                portNode.setAttribute('r', '5');
+                portNode.setAttribute('tabindex', '0');
+                portNode.setAttribute('class', 'topology-port-node');
+                portNode.setAttribute('data-port-id', String(Number(port.id || 0)));
+                portNode.setAttribute('data-device-id', String(entry.device_id));
+
+                const portTitle = svgElement('title');
+                portTitle.textContent = `${port.name || 'Port'} (${entry.device_name})`;
+                portNode.appendChild(portTitle);
+
+                const activatePort = () => {
+                    clearActiveSelections();
+                    portNode.classList.add('active');
+                    showOverlay({
+                        kind: 'port',
+                        port_id: Number(port.id || 0),
+                        port_name: port.name || `Port ${portIndex + 1}`,
+                        is_connected: !!port.is_connected,
+                        device_id: entry.device_id,
+                        device_name: entry.device_name,
+                        rack_name: entry.rack_name,
+                        floor_name: entry.floor_name
+                    });
+                };
+
+                portNode.addEventListener('click', activatePort);
+                portNode.addEventListener('keydown', (event) => {
+                    if (event.key === 'Enter' || event.key === ' ') {
+                        event.preventDefault();
+                        activatePort();
+                    }
+                });
+
+                nodeLayer.appendChild(portNode);
+            });
+        });
+
+        rackLinks.forEach((link) => {
+            const fromRackId = Number(link.from_rack_id || 0);
+            const toRackId = Number(link.to_rack_id || 0);
+            const count = Math.max(1, Number(link.count || 1));
+            const fromPoint = layout.rackCenters.get(fromRackId);
+            const toPoint = layout.rackCenters.get(toRackId);
+            if (!fromPoint || !toPoint) {
+                return;
+            }
+
+            const line = svgElement('line');
+            line.setAttribute('x1', String(fromPoint.x));
+            line.setAttribute('y1', String(fromPoint.y));
+            line.setAttribute('x2', String(toPoint.x));
+            line.setAttribute('y2', String(toPoint.y));
+            line.setAttribute('class', 'topology-connection-line');
+            line.setAttribute('stroke-width', String(Math.min(8, 1 + count)));
+            line.setAttribute('tabindex', '0');
+
+            const title = svgElement('title');
+            title.textContent = `${link.from_rack_name} <-> ${link.to_rack_name}: ${count} Verbindungen`;
+            line.appendChild(title);
+
+            const activateConnection = () => {
+                clearActiveSelections();
+                line.classList.add('active');
+                showOverlay({
+                    kind: 'connection',
+                    from_name: link.from_rack_name || `Rack ${fromRackId}`,
+                    to_name: link.to_rack_name || `Rack ${toRackId}`,
+                    count,
+                    sample_connection_id: Number(link.sample_connection_id || 0)
+                });
+            };
+
+            line.addEventListener('click', activateConnection);
+            line.addEventListener('keydown', (event) => {
+                if (event.key === 'Enter' || event.key === ' ') {
+                    event.preventDefault();
+                    activateConnection();
+                }
+            });
+            connectionLayer.appendChild(line);
         });
     }
 
@@ -446,6 +952,11 @@ $topologyPayload = array_map(static function (array $row): array {
     }, { passive: false });
 
     svg.addEventListener('pointerdown', (event) => {
+        const target = event.target;
+        if (target instanceof Element && (target.closest('.topology-node') || target.closest('.topology-port-node') || target.closest('.topology-connection-line'))) {
+            drag = null;
+            return;
+        }
         drag = {
             startX: event.clientX,
             startY: event.clientY,
@@ -497,6 +1008,7 @@ $topologyPayload = array_map(static function (array $row): array {
     if (closeButton && overlay) {
         closeButton.addEventListener('click', () => {
             overlay.hidden = true;
+            clearActiveSelections();
         });
     }
 
@@ -659,12 +1171,42 @@ $topologyPayload = array_map(static function (array $row): array {
     stroke-width: 1;
 }
 
-.topology-floor-label {
+.topology-location-box {
+    fill: none;
+    stroke: #a9c0de;
+    stroke-width: 2;
+}
+
+.topology-building-box {
+    fill: none;
+    stroke: #c3d3e8;
+    stroke-width: 1.5;
+}
+
+.topology-floor-box {
+    fill: none;
+    stroke: #d0deef;
+    stroke-width: 1.2;
+}
+
+.topology-location-label {
     font-size: 28px;
     font-weight: 700;
     fill: #23304a;
 }
 
+.topology-building-label {
+    font-size: 18px;
+    font-weight: 700;
+    fill: #2a3d5c;
+}
+
+.topology-floor-label {
+    font-size: 14px;
+    font-weight: 700;
+    fill: #3f5679;
+}
+
 .topology-rack-box {
     fill: #ffffff;
     stroke: #bfd0e6;
@@ -672,15 +1214,31 @@ $topologyPayload = array_map(static function (array $row): array {
 }
 
 .topology-rack-label {
-    font-size: 16px;
+    font-size: 14px;
     font-weight: 600;
     fill: #2a3d5c;
 }
 
+.topology-connection-line {
+    stroke: #426da4;
+    stroke-opacity: 0.55;
+    stroke-linecap: round;
+    cursor: pointer;
+}
+
+.topology-connection-line:hover,
+.topology-connection-line:focus,
+.topology-connection-line.active {
+    stroke: #d2612a;
+    stroke-opacity: 0.85;
+    outline: none;
+}
+
 .topology-node {
     fill: #1f73c9;
     stroke: #ffffff;
     stroke-width: 3;
+    cursor: pointer;
 }
 
 .topology-node:hover,
@@ -690,6 +1248,20 @@ $topologyPayload = array_map(static function (array $row): array {
     outline: none;
 }
 
+.topology-port-node {
+    fill: #3d9640;
+    stroke: #ffffff;
+    stroke-width: 2;
+    cursor: pointer;
+}
+
+.topology-port-node:hover,
+.topology-port-node:focus,
+.topology-port-node.active {
+    fill: #f18d32;
+    outline: none;
+}
+
 .topology-empty {
     margin-top: 12px;
     padding: 10px;
@@ -725,6 +1297,13 @@ $topologyPayload = array_map(static function (array $row): array {
     margin: 8px 0;
 }
 
+.topology-overlay__actions {
+    margin-top: 10px;
+    display: flex;
+    gap: 8px;
+    flex-wrap: wrap;
+}
+
 @media (max-width: 900px) {
     #dashboard-topology-svg {
         height: 360px;

app/modules/device_types/edit.php

@@ -86,6 +86,7 @@ $pageTitle = $isEdit ? "Gerätetyp bearbeiten: " . htmlspecialchars($deviceType[
                 <textarea id="comment" name="comment" rows="3"
                     placeholder="z.B. Rack-Mount, 48 RJ45 + 4 SFP"><?php echo htmlspecialchars($deviceType['comment'] ?? ''); ?></textarea>
             </div>
+            <?php if (!$isEdit): ?>
             <div class="form-group">
                 <label for="seed_ports">Ports automatisch anlegen</label>
                 <input type="number" id="seed_ports" name="seed_ports" min="0" step="1"
@@ -106,6 +107,7 @@ $pageTitle = $isEdit ? "Gerätetyp bearbeiten: " . htmlspecialchars($deviceType[
                 </select>
                 <small>Wird beim automatischen Erstellen neuer Ports als Startwert gesetzt.</small>
             </div>
+            <?php endif; ?>
         </fieldset>
 
         <!-- =========================

app/modules/device_types/save.php

@@ -21,7 +21,8 @@ $deviceTypeId = (int)($_POST['id'] ?? 0);
 $name = trim($_POST['name'] ?? '');
 $category = $_POST['category'] ?? 'other';
 $comment = trim($_POST['comment'] ?? '');
-$seedPortCount = max(0, (int)($_POST['seed_ports'] ?? 0));
+$isCreate = $deviceTypeId <= 0;
+$seedPortCount = $isCreate ? max(0, (int)($_POST['seed_ports'] ?? 0)) : 0;
 $defaultPortTypeId = normalizeNullableInt($_POST['default_port_type_id'] ?? null);
 $portRows = is_array($_POST['port_rows'] ?? null) ? $_POST['port_rows'] : [];
 $rawShapes = trim($_POST['shape_definition'] ?? '');
@@ -49,6 +50,7 @@ if (!in_array($category, ['switch', 'server', 'patchpanel', 'other'])) {
 // Falls Fehler: zurück zum Edit-Formular
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     header('Location: ?module=device_types&action=edit' . ($deviceTypeId ? "&id=$deviceTypeId" : ""));
     exit;
 }
@@ -67,6 +69,7 @@ if (!empty($_FILES['image']['name'])) {
     // Nur SVG, JPG, PNG erlaubt
     if (!in_array($fileExt, ['svg', 'jpg', 'jpeg', 'png'])) {
         $_SESSION['error'] = "Nur SVG, JPG und PNG sind erlaubt";
+        $_SESSION['validation_errors'] = ["Nur SVG, JPG und PNG sind erlaubt"];
         header('Location: ?module=device_types&action=edit' . ($deviceTypeId ? "&id=$deviceTypeId" : ""));
         exit;
     }
@@ -86,6 +89,7 @@ if (!empty($_FILES['image']['name'])) {
         $imageType = $fileExt === 'svg' ? 'svg' : 'bitmap';
     } else {
         $_SESSION['error'] = "Datei-Upload fehlgeschlagen";
+        $_SESSION['validation_errors'] = ["Datei-Upload fehlgeschlagen"];
         header('Location: ?module=device_types&action=edit' . ($deviceTypeId ? "&id=$deviceTypeId" : ""));
         exit;
     }
@@ -128,7 +132,9 @@ if ($deviceTypeId > 0) {
     }
 }
 
-seedDeviceTypePorts($sql, $deviceTypeId, $seedPortCount, $defaultPortTypeId);
+if ($isCreate) {
+    seedDeviceTypePorts($sql, $deviceTypeId, $seedPortCount, $defaultPortTypeId);
+}
 syncDeviceTypePorts($sql, $deviceTypeId, $portRows);
 
 $_SESSION['success'] = $deviceTypeId ? "Gerätetyp gespeichert" : "Fehler beim Speichern";

app/modules/devices/delete.php

@@ -3,12 +3,20 @@
  * app/modules/devices/delete.php
  *
  * Loescht ein Geraet. Bei Abhaengigkeiten ist force=1 erforderlich.
+ * Unterstuetzt GET-Redirects und AJAX-POST.
  */
 
-$deviceId = (int)($_GET['id'] ?? 0);
-$forceDelete = (int)($_GET['force'] ?? 0) === 1;
+$isPost = ($_SERVER['REQUEST_METHOD'] ?? '') === 'POST';
+$deviceId = (int)($_POST['id'] ?? $_GET['id'] ?? 0);
+$forceDelete = (int)($_POST['force'] ?? $_GET['force'] ?? 0) === 1;
 
 if ($deviceId <= 0) {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(400);
+        echo json_encode(['success' => false, 'message' => 'Ungueltige Geraete-ID']);
+        exit;
+    }
     $_SESSION['error'] = "Ungueltige Geraete-ID";
     header('Location: ?module=devices&action=list');
     exit;
@@ -21,6 +29,12 @@ $device = $sql->single(
 );
 
 if (!$device) {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(404);
+        echo json_encode(['success' => false, 'message' => 'Geraet nicht gefunden']);
+        exit;
+    }
     $_SESSION['error'] = "Geraet nicht gefunden";
     header('Location: ?module=devices&action=list');
     exit;
@@ -42,10 +56,10 @@ $dependencies = $sql->single(
         (
             SELECT COUNT(*)
             FROM connections c
-            WHERE (c.port_a_type = 'device' AND c.port_a_id IN (
+            WHERE ((c.port_a_type = 'device' OR c.port_a_type = 'device_ports') AND c.port_a_id IN (
                     SELECT dp3.id FROM device_ports dp3 WHERE dp3.device_id = ?
                   ))
-               OR (c.port_b_type = 'device' AND c.port_b_id IN (
+               OR ((c.port_b_type = 'device' OR c.port_b_type = 'device_ports') AND c.port_b_id IN (
                     SELECT dp4.id FROM device_ports dp4 WHERE dp4.device_id = ?
                   ))
         ) AS connection_count",
@@ -70,7 +84,23 @@ if ($hasDependencies && !$forceDelete) {
         $parts[] = $moduleCount . ' Port-Module';
     }
 
-    $_SESSION['error'] = "Geraet hat abhaengige Daten (" . implode(', ', $parts) . "). Loeschen bitte bestaetigen.";
+    $dependencyMessage = "Geraet hat abhaengige Daten (" . implode(', ', $parts) . "). Loeschen bitte bestaetigen.";
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(409);
+        echo json_encode([
+            'success' => false,
+            'requires_force' => true,
+            'message' => $dependencyMessage,
+            'dependencies' => [
+                'connections' => $connectionCount,
+                'ports' => $portCount,
+                'modules' => $moduleCount
+            ]
+        ]);
+        exit;
+    }
+    $_SESSION['error'] = $dependencyMessage;
     header('Location: ?module=devices&action=edit&id=' . urlencode((string)$deviceId));
     exit;
 }
@@ -78,8 +108,8 @@ if ($hasDependencies && !$forceDelete) {
 // Connections referenzieren device_ports nur logisch, daher manuell entfernen.
 $sql->set(
     "DELETE FROM connections
-     WHERE (port_a_type = 'device' AND port_a_id IN (SELECT id FROM device_ports WHERE device_id = ?))
-        OR (port_b_type = 'device' AND port_b_id IN (SELECT id FROM device_ports WHERE device_id = ?))",
+     WHERE ((port_a_type = 'device' OR port_a_type = 'device_ports') AND port_a_id IN (SELECT id FROM device_ports WHERE device_id = ?))
+        OR ((port_b_type = 'device' OR port_b_type = 'device_ports') AND port_b_id IN (SELECT id FROM device_ports WHERE device_id = ?))",
     "ii",
     [$deviceId, $deviceId]
 );
@@ -91,8 +121,19 @@ $deleted = $sql->set(
 );
 
 if ($deleted > 0) {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        echo json_encode(['success' => true, 'message' => "Geraet geloescht: " . $device['name']]);
+        exit;
+    }
     $_SESSION['success'] = "Geraet geloescht: " . $device['name'];
 } else {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(500);
+        echo json_encode(['success' => false, 'message' => 'Geraet konnte nicht geloescht werden']);
+        exit;
+    }
     $_SESSION['error'] = "Geraet konnte nicht geloescht werden";
 }
 

app/modules/devices/edit.php

@@ -47,10 +47,10 @@ if ($isEdit) {
             (
                 SELECT COUNT(*)
                 FROM connections c
-                WHERE (c.port_a_type = 'device' AND c.port_a_id IN (
+                WHERE ((c.port_a_type = 'device' OR c.port_a_type = 'device_ports') AND c.port_a_id IN (
                         SELECT dp3.id FROM device_ports dp3 WHERE dp3.device_id = ?
                       ))
-                   OR (c.port_b_type = 'device' AND c.port_b_id IN (
+                   OR ((c.port_b_type = 'device' OR c.port_b_type = 'device_ports') AND c.port_b_id IN (
                         SELECT dp4.id FROM device_ports dp4 WHERE dp4.device_id = ?
                       ))
             ) AS connection_count",
@@ -64,6 +64,19 @@ if ($isEdit) {
 // =========================
 $deviceTypes = $sql->get("SELECT id, name, category FROM device_types ORDER BY name", "", []);
 $racks = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
+$devicePorts = [];
+
+if ($isEdit) {
+    $devicePorts = $sql->get(
+        "SELECT dp.id, dp.name, dp.status, dp.mode, dp.vlan_config, pt.name AS port_type_name
+         FROM device_ports dp
+         LEFT JOIN port_types pt ON pt.id = dp.port_type_id
+         WHERE dp.device_id = ?
+         ORDER BY dp.id",
+        "i",
+        [$deviceId]
+    );
+}
 
 ?>
 
@@ -160,6 +173,67 @@ $racks = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
             </div>
         </fieldset>
 
+        <fieldset>
+            <legend>Ports</legend>
+            <?php if ($isEdit): ?>
+                <?php if (!empty($devicePorts)): ?>
+                    <p><small>Portstatus und VLAN-Zuordnung koennen hier direkt gepflegt werden (VLANs kommagetrennt, z. B. 10,20,30).</small></p>
+                    <table class="device-port-table">
+                        <thead>
+                            <tr>
+                                <th>Name</th>
+                                <th>Port-Typ</th>
+                                <th>Status</th>
+                                <th>Modus</th>
+                                <th>VLANs</th>
+                            </tr>
+                        </thead>
+                        <tbody>
+                            <?php foreach ($devicePorts as $port): ?>
+                                <?php
+                                    $vlanValue = '';
+                                    if (!empty($port['vlan_config'])) {
+                                        $decodedVlans = json_decode((string)$port['vlan_config'], true);
+                                        if (is_array($decodedVlans)) {
+                                            $vlanValue = implode(', ', array_map('strval', $decodedVlans));
+                                        } else {
+                                            $vlanValue = (string)$port['vlan_config'];
+                                        }
+                                    }
+                                    $statusValue = (string)($port['status'] ?? 'active');
+                                    if (!in_array($statusValue, ['active', 'disabled'], true)) {
+                                        $statusValue = 'active';
+                                    }
+                                ?>
+                                <tr>
+                                    <td>
+                                        <input type="text" name="device_ports[<?php echo (int)$port['id']; ?>][name]" value="<?php echo htmlspecialchars((string)$port['name']); ?>">
+                                    </td>
+                                    <td><?php echo htmlspecialchars((string)($port['port_type_name'] ?? '-')); ?></td>
+                                    <td>
+                                        <select name="device_ports[<?php echo (int)$port['id']; ?>][status]">
+                                            <option value="active" <?php echo $statusValue === 'active' ? 'selected' : ''; ?>>aktiv</option>
+                                            <option value="disabled" <?php echo $statusValue === 'disabled' ? 'selected' : ''; ?>>inaktiv</option>
+                                        </select>
+                                    </td>
+                                    <td>
+                                        <input type="text" name="device_ports[<?php echo (int)$port['id']; ?>][mode]" value="<?php echo htmlspecialchars((string)($port['mode'] ?? '')); ?>" placeholder="z. B. access/trunk">
+                                    </td>
+                                    <td>
+                                        <input type="text" name="device_ports[<?php echo (int)$port['id']; ?>][vlan_config]" value="<?php echo htmlspecialchars($vlanValue); ?>" placeholder="10,20,30">
+                                    </td>
+                                </tr>
+                            <?php endforeach; ?>
+                        </tbody>
+                    </table>
+                <?php else: ?>
+                    <p><small>Zu diesem Geraet sind aktuell keine Ports vorhanden.</small></p>
+                <?php endif; ?>
+            <?php else: ?>
+                <p><small>Ports werden nach dem ersten Speichern automatisch aus dem Geraetetyp erzeugt und koennen dann hier gepflegt werden.</small></p>
+            <?php endif; ?>
+        </fieldset>
+
         <!-- =========================
              Aktionen
              ========================= -->
@@ -264,34 +338,64 @@ $racks = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
 .button:hover {
     opacity: 0.8;
 }
+
+.device-port-table {
+    width: 100%;
+    border-collapse: collapse;
+    margin-top: 10px;
+}
+
+.device-port-table th,
+.device-port-table td {
+    border-bottom: 1px solid #ddd;
+    padding: 8px;
+    text-align: left;
+}
+
+.device-port-table input,
+.device-port-table select {
+    width: 100%;
+    min-width: 120px;
+}
 </style>
 
 <script>
 function confirmDelete(link, id, connectionCount, portCount, moduleCount) {
-    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 = (link && link.href ? link.href : ('?module=devices&action=delete&id=' + encodeURIComponent(id))) + '&force=1';
-            return false;
-        }
-
-        return true;
+    if (!confirm('Dieses Geraet wirklich loeschen?')) {
+        return false;
     }
 
+    const requestDelete = (forceDelete) => {
+        const body = ['id=' + encodeURIComponent(id)];
+        if (forceDelete) {
+            body.push('force=1');
+        }
+
+        fetch('?module=devices&action=delete', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
+            body: body.join('&')
+        })
+            .then((response) => response.json())
+            .then((data) => {
+                if (data && data.success) {
+                    window.location.href = '?module=devices&action=list';
+                    return;
+                }
+
+                if (data && data.requires_force) {
+                    if (confirm(data.message || 'Es gibt abhaengige Daten. Trotzdem loeschen?')) {
+                        requestDelete(true);
+                    }
+                    return;
+                }
+
+                alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
+            })
+            .catch(() => alert('Loeschen fehlgeschlagen'));
+    };
+
+    requestDelete(false);
     return false;
 }
 </script>

app/modules/devices/list.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * modules/devices/list.php
- * Vollständige Geräteübersicht mit Filter
+ * Vollstaendige Geraeteuebersicht mit Filter
  */
 
 // =========================
@@ -22,69 +22,88 @@ $params  = [];
 
 if ($search !== '') {
     $where[] = "(d.name LIKE ? OR d.serial_number LIKE ? OR dt.name LIKE ?)";
-    $types  .= "sss";
+    $types  .= 'sss';
     $params[] = "%$search%";
     $params[] = "%$search%";
     $params[] = "%$search%";
 }
 
 if ($typeId > 0) {
-    $where[] = "d.device_type_id = ?";
-    $types  .= "i";
+    $where[] = 'd.device_type_id = ?';
+    $types  .= 'i';
     $params[] = $typeId;
 }
 
 if ($floorId > 0) {
-    $where[] = "f.id = ?";
-    $types  .= "i";
+    $where[] = 'f.id = ?';
+    $types  .= 'i';
     $params[] = $floorId;
 }
 
 if ($rackId > 0) {
-    $where[] = "d.rack_id = ?";
-    $types  .= "i";
+    $where[] = 'd.rack_id = ?';
+    $types  .= 'i';
     $params[] = $rackId;
 }
 
 $whereSql = $where ? 'WHERE ' . implode(' AND ', $where) : '';
 
 // =========================
-// Geräte laden
+// Geraete laden
 // =========================
-        $devices = $sql->get(
-            "
-            SELECT
-                d.id,
-                d.name,
-                d.serial_number,
-                d.rack_position_he,
-                d.rack_height_he,
-                d.web_config_url,
-                dt.name AS device_type,
-                dt.image_path,
-                f.name AS floor_name,
-                r.name AS rack_name,
-                (
-                    SELECT COUNT(*)
-                    FROM device_ports dp
-                    WHERE dp.device_id = d.id
-                ) AS port_count,
-                (
-                    SELECT COUNT(*)
-                    FROM device_port_modules dpm
-                    JOIN device_ports dp2 ON dp2.id = dpm.device_port_id
-                    WHERE dp2.device_id = d.id
-                ) AS module_count,
-                (
-                    SELECT COUNT(*)
-                    FROM connections c
-                    WHERE (c.port_a_type = 'device' AND c.port_a_id IN (
-                            SELECT dp3.id FROM device_ports dp3 WHERE dp3.device_id = d.id
-                          ))
-                       OR (c.port_b_type = 'device' AND c.port_b_id IN (
-                            SELECT dp4.id FROM device_ports dp4 WHERE dp4.device_id = d.id
-                          ))
-                ) AS connection_count
+$devices = $sql->get(
+    "
+    SELECT
+        d.id,
+        d.name,
+        d.serial_number,
+        d.rack_position_he,
+        d.rack_height_he,
+        d.web_config_url,
+        dt.name AS device_type,
+        dt.image_path,
+        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_ports dp
+            WHERE dp.device_id = d.id
+              AND dp.status = 'active'
+        ) AS active_port_count,
+        (
+            SELECT COUNT(*)
+            FROM device_ports dp
+            WHERE dp.device_id = d.id
+              AND dp.status = 'disabled'
+        ) AS disabled_port_count,
+        (
+            SELECT COUNT(*)
+            FROM device_ports dp
+            WHERE dp.device_id = d.id
+              AND dp.vlan_config IS NOT NULL
+              AND dp.vlan_config <> '[]'
+        ) AS vlan_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' OR c.port_a_type = 'device_ports') 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' OR c.port_b_type = 'device_ports') 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
@@ -99,22 +118,19 @@ $whereSql = $where ? 'WHERE ' . implode(' AND ', $where) : '';
 // =========================
 // Filter-Daten laden
 // =========================
-$deviceTypes = $sql->get("SELECT id, name FROM device_types ORDER BY name", "", []);
-$floors      = $sql->get("SELECT id, name FROM floors ORDER BY name", "", []);
-$racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
+$deviceTypes = $sql->get('SELECT id, name FROM device_types ORDER BY name', '', []);
+$floors      = $sql->get('SELECT id, name FROM floors ORDER BY name', '', []);
+$racks       = $sql->get('SELECT id, name FROM racks ORDER BY name', '', []);
 ?>
 
 <div class="devices-container">
-    <h1>Geräte</h1>
+    <h1>Geraete</h1>
 
-    <!-- =========================
-         Filter-Toolbar
-         ========================= -->
     <form method="get" class="filter-form">
         <input type="hidden" name="module" value="devices">
         <input type="hidden" name="action" value="list">
 
-        <input type="text" name="search" placeholder="Suche nach Name oder Seriennummer…"
+        <input type="text" name="search" placeholder="Suche nach Name oder Seriennummer..."
             value="<?php echo htmlspecialchars($search); ?>" class="search-input">
 
         <select name="type_id">
@@ -149,16 +165,13 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
         <a href="?module=devices&action=list" class="button">Reset</a>
 
         <a href="?module=devices&action=edit" class="button button-primary" style="margin-left: auto;">
-            + Neues Gerät
+            + Neues Geraet
         </a>
     </form>
 
-    <!-- =========================
-         Geräte-Liste
-         ========================= -->
     <?php if (!empty($devices)): ?>
     <div class="device-stats">
-        <p>Gefundene Geräte: <strong><?php echo count($devices); ?></strong></p>
+        <p>Gefundene Geraete: <strong><?php echo count($devices); ?></strong></p>
     </div>
 
     <table class="device-list">
@@ -169,6 +182,7 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
                 <th>Stockwerk</th>
                 <th>Rack</th>
                 <th>Position (HE)</th>
+                <th>Ports</th>
                 <th>Seriennummer</th>
                 <th>Webconfig</th>
                 <th>Aktionen</th>
@@ -186,28 +200,37 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
                 </td>
 
                 <td>
-                    <?php echo htmlspecialchars($d['floor_name'] ?? '—'); ?>
+                    <?php echo htmlspecialchars($d['floor_name'] ?? '-'); ?>
                 </td>
 
                 <td>
-                    <?php echo htmlspecialchars($d['rack_name'] ?? '—'); ?>
+                    <?php echo htmlspecialchars($d['rack_name'] ?? '-'); ?>
                 </td>
 
                 <td>
                     <?php
                         if ($d['rack_position_he']) {
-                            echo $d['rack_position_he'];
+                            echo (int)$d['rack_position_he'];
                             if ($d['rack_height_he']) {
-                                echo "–" . ($d['rack_position_he'] + $d['rack_height_he'] - 1);
+                                echo '-' . ((int)$d['rack_position_he'] + (int)$d['rack_height_he'] - 1);
                             }
                         } else {
-                            echo "—";
+                            echo '-';
                         }
                     ?>
                 </td>
 
                 <td>
-                    <small><?php echo htmlspecialchars($d['serial_number'] ?? '—'); ?></small>
+                    <small>
+                        <?php echo (int)$d['port_count']; ?> gesamt<br>
+                        <?php echo (int)$d['active_port_count']; ?> aktiv /
+                        <?php echo (int)$d['disabled_port_count']; ?> inaktiv<br>
+                        VLAN gesetzt: <?php echo (int)$d['vlan_port_count']; ?>
+                    </small>
+                </td>
+
+                <td>
+                    <small><?php echo htmlspecialchars($d['serial_number'] ?? '-'); ?></small>
                 </td>
 
                 <td>
@@ -216,13 +239,13 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
                             Webconfig
                         </a>
                     <?php else: ?>
-                        —
+                        -
                     <?php endif; ?>
                 </td>
 
                 <td class="actions">
                     <a href="?module=devices&action=edit&id=<?php echo $d['id']; ?>" class="button button-small">Bearbeiten</a>
-                    <a href="?module=devices&action=delete&id=<?php echo (int)$d['id']; ?>" class="button button-small button-danger" onclick="return confirmDelete(this, <?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>
+                    <a href="?module=devices&action=delete&id=<?php echo (int)$d['id']; ?>" class="button button-small button-danger" onclick="return confirmDelete(this, <?php echo (int)$d['id']; ?>, <?php echo (int)$d['connection_count']; ?>, <?php echo (int)$d['port_count']; ?>, <?php echo (int)$d['module_count']; ?>)">Loeschen</a>
                 </td>
             </tr>
             <?php endforeach; ?>
@@ -231,10 +254,10 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
 
     <?php else: ?>
     <div class="empty-state">
-        <p>Keine Geräte gefunden.</p>
+        <p>Keine Geraete gefunden.</p>
         <p>
             <a href="?module=devices&action=edit" class="button button-primary">
-                Erstes Gerät anlegen
+                Erstes Geraet anlegen
             </a>
         </p>
     </div>
@@ -351,33 +374,41 @@ $racks       = $sql->get("SELECT id, name FROM racks ORDER BY name", "", []);
 
 <script>
 function confirmDelete(link, id, connectionCount, portCount, moduleCount) {
-    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 = (link && link.href ? link.href : ('?module=devices&action=delete&id=' + encodeURIComponent(id))) + '&force=1';
-            return false;
-        }
-
-        return true;
+    if (!confirm('Dieses Geraet wirklich loeschen?')) {
+        return false;
     }
 
+    const requestDelete = (forceDelete) => {
+        const body = ['id=' + encodeURIComponent(id)];
+        if (forceDelete) {
+            body.push('force=1');
+        }
+
+        fetch('?module=devices&action=delete', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
+            body: body.join('&')
+        })
+            .then((response) => response.json())
+            .then((data) => {
+                if (data && data.success) {
+                    window.location.reload();
+                    return;
+                }
+
+                if (data && data.requires_force) {
+                    if (confirm(data.message || 'Es gibt abhaengige Daten. Trotzdem loeschen?')) {
+                        requestDelete(true);
+                    }
+                    return;
+                }
+
+                alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
+            })
+            .catch(() => alert('Loeschen fehlgeschlagen'));
+    };
+
+    requestDelete(false);
     return false;
 }
 </script>
-
-
-

app/modules/devices/save.php

@@ -25,6 +25,7 @@ $rackHeightHe = (int)($_POST['rack_height_he'] ?? 1);
 $serialNumber = trim($_POST['serial_number'] ?? '');
 $comment = trim($_POST['comment'] ?? '');
 $webConfigUrl = trim($_POST['web_config_url'] ?? '');
+$devicePortRows = is_array($_POST['device_ports'] ?? null) ? $_POST['device_ports'] : [];
 if ($webConfigUrl === '') {
     $webConfigUrl = null;
 }
@@ -57,6 +58,7 @@ if ($rackHeightHe < 1) {
 // Falls Fehler: zurück zum Edit-Formular
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirectUrl = $deviceId ? "?module=devices&action=edit&id=$deviceId" : "?module=devices&action=edit";
     header("Location: $redirectUrl");
     exit;
@@ -87,6 +89,9 @@ if ($isNewDevice) {
 if ($isNewDevice && $deviceId > 0) {
     copyDevicePortsFromType($sql, $deviceId, $deviceTypeId);
 }
+if ($deviceId > 0 && !$isNewDevice && !empty($devicePortRows)) {
+    syncDevicePorts($sql, $deviceId, $devicePortRows);
+}
 
 $_SESSION['success'] = "Gerät gespeichert";
 
@@ -138,3 +143,105 @@ function copyDevicePortsFromType($sql, $deviceId, $deviceTypeId)
         }
     }
 }
+
+function syncDevicePorts($sql, $deviceId, array $rows)
+{
+    $ports = $sql->get(
+        "SELECT id, name FROM device_ports WHERE device_id = ?",
+        "i",
+        [$deviceId]
+    );
+    if (empty($ports)) {
+        return;
+    }
+
+    $allowedIds = [];
+    $currentNames = [];
+    foreach ($ports as $port) {
+        $portId = (int)($port['id'] ?? 0);
+        if ($portId <= 0) {
+            continue;
+        }
+        $allowedIds[$portId] = true;
+        $currentNames[$portId] = (string)($port['name'] ?? '');
+    }
+
+    foreach ($rows as $portIdRaw => $row) {
+        $portId = (int)$portIdRaw;
+        if ($portId <= 0 || !isset($allowedIds[$portId]) || !is_array($row)) {
+            continue;
+        }
+
+        $name = trim((string)($row['name'] ?? ''));
+        if ($name === '') {
+            $name = $currentNames[$portId] ?? ('Port ' . $portId);
+        }
+
+        $status = trim((string)($row['status'] ?? 'active'));
+        if (!in_array($status, ['active', 'disabled'], true)) {
+            $status = 'active';
+        }
+
+        $mode = trim((string)($row['mode'] ?? ''));
+        $mode = $mode !== '' ? $mode : null;
+        $vlanJson = normalizeVlanConfig($row['vlan_config'] ?? '');
+
+        if ($mode !== null && $vlanJson !== null) {
+            $sql->set(
+                "UPDATE device_ports
+                 SET name = ?, status = ?, mode = ?, vlan_config = ?
+                 WHERE id = ? AND device_id = ?",
+                "ssssii",
+                [$name, $status, $mode, $vlanJson, $portId, $deviceId]
+            );
+        } elseif ($mode !== null) {
+            $sql->set(
+                "UPDATE device_ports
+                 SET name = ?, status = ?, mode = ?, vlan_config = NULL
+                 WHERE id = ? AND device_id = ?",
+                "sssii",
+                [$name, $status, $mode, $portId, $deviceId]
+            );
+        } elseif ($vlanJson !== null) {
+            $sql->set(
+                "UPDATE device_ports
+                 SET name = ?, status = ?, mode = NULL, vlan_config = ?
+                 WHERE id = ? AND device_id = ?",
+                "sssii",
+                [$name, $status, $vlanJson, $portId, $deviceId]
+            );
+        } else {
+            $sql->set(
+                "UPDATE device_ports
+                 SET name = ?, status = ?, mode = NULL, vlan_config = NULL
+                 WHERE id = ? AND device_id = ?",
+                "ssii",
+                [$name, $status, $portId, $deviceId]
+            );
+        }
+    }
+}
+
+function normalizeVlanConfig($raw)
+{
+    $value = trim((string)$raw);
+    if ($value === '') {
+        return null;
+    }
+
+    $parts = preg_split('/[\s,;]+/', $value);
+    $normalized = [];
+    foreach ((array)$parts as $part) {
+        $entry = trim((string)$part);
+        if ($entry === '') {
+            continue;
+        }
+        $normalized[$entry] = true;
+    }
+
+    if (empty($normalized)) {
+        return null;
+    }
+
+    return json_encode(array_keys($normalized), JSON_UNESCAPED_UNICODE);
+}

app/modules/floor_infrastructure/delete.php

@@ -2,30 +2,48 @@
 /**
  * app/modules/floor_infrastructure/delete.php
  *
- * Loescht Patchpanels oder Wandbuchsen.
+ * Loescht Patchpanels oder Wandbuchsen (AJAX-POST bevorzugt).
  */
 
-$type = strtolower(trim((string)($_GET['type'] ?? '')));
-$id = (int)($_GET['id'] ?? 0);
+$isPost = ($_SERVER['REQUEST_METHOD'] ?? '') === 'POST';
+$type = strtolower(trim((string)($_POST['type'] ?? $_GET['type'] ?? '')));
+$id = (int)($_POST['id'] ?? $_GET['id'] ?? 0);
 
 if ($id <= 0 || !in_array($type, ['patchpanel', 'outlet'], true)) {
+    if ($isPost) {
+        header('Content-Type: application/json; charset=utf-8');
+        http_response_code(400);
+        echo json_encode(['success' => false, 'message' => 'Ungueltige Anfrage']);
+        exit;
+    }
     header('Location: ?module=floor_infrastructure&action=list');
     exit;
 }
 
 if ($type === 'patchpanel') {
-    $sql->set(
+    $rows = $sql->set(
         "DELETE FROM floor_patchpanels WHERE id = ?",
         "i",
         [$id]
     );
 } else {
-    $sql->set(
+    $rows = $sql->set(
         "DELETE FROM network_outlets WHERE id = ?",
         "i",
         [$id]
     );
 }
 
+if ($isPost) {
+    header('Content-Type: application/json; charset=utf-8');
+    if ($rows > 0) {
+        echo json_encode(['success' => true, 'message' => 'Infrastrukturobjekt geloescht']);
+    } else {
+        http_response_code(404);
+        echo json_encode(['success' => false, 'message' => 'Infrastrukturobjekt nicht gefunden oder bereits geloescht']);
+    }
+    exit;
+}
+
 header('Location: ?module=floor_infrastructure&action=list');
 exit;

app/modules/floor_infrastructure/edit.php

@@ -125,6 +125,58 @@ $mapOutlets = $sql->get(
     "",
     []
 );
+
+$patchpanelPortOptions = $sql->get(
+    "SELECT
+        fpp.id,
+        fpp.name,
+        fp.name AS patchpanel_name,
+        fp.floor_id,
+        f.name AS floor_name,
+        EXISTS(
+            SELECT 1
+            FROM connections c
+            WHERE
+                ((c.port_a_type = 'patchpanel' OR c.port_a_type = 'floor_patchpanel_ports') AND c.port_a_id = fpp.id)
+                OR
+                ((c.port_b_type = 'patchpanel' OR c.port_b_type = 'floor_patchpanel_ports') AND c.port_b_id = fpp.id)
+        ) AS is_occupied
+     FROM floor_patchpanel_ports fpp
+     JOIN floor_patchpanels fp ON fp.id = fpp.patchpanel_id
+     LEFT JOIN floors f ON f.id = fp.floor_id
+     ORDER BY f.name, fp.name, fpp.name",
+    "",
+    []
+);
+
+$selectedBindPatchpanelPortId = 0;
+if ($type === 'outlet' && $id > 0) {
+    $selectedBindPatchpanelPortId = (int)($sql->single(
+        "SELECT
+            CASE
+                WHEN (c.port_a_type = 'patchpanel' OR c.port_a_type = 'floor_patchpanel_ports') THEN c.port_a_id
+                WHEN (c.port_b_type = 'patchpanel' OR c.port_b_type = 'floor_patchpanel_ports') THEN c.port_b_id
+                ELSE 0
+            END AS patchpanel_port_id
+         FROM connections c
+         JOIN network_outlet_ports nop
+           ON (
+                ((c.port_a_type = 'outlet' OR c.port_a_type = 'network_outlet_ports') AND c.port_a_id = nop.id)
+                OR
+                ((c.port_b_type = 'outlet' OR c.port_b_type = 'network_outlet_ports') AND c.port_b_id = nop.id)
+              )
+         WHERE nop.outlet_id = ?
+           AND (
+                c.port_a_type = 'patchpanel' OR c.port_a_type = 'floor_patchpanel_ports'
+                OR
+                c.port_b_type = 'patchpanel' OR c.port_b_type = 'floor_patchpanel_ports'
+           )
+         ORDER BY c.id
+         LIMIT 1",
+        "i",
+        [$id]
+    )['patchpanel_port_id'] ?? 0);
+}
 ?>
 
 <div class="floor-infra-edit">
@@ -205,10 +257,9 @@ $mapOutlets = $sql->get(
                          data-active-id="<?php echo (int)($panel['id'] ?? 0); ?>"
                          data-reference-panels="<?php echo htmlspecialchars(json_encode($mapPatchPanels, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), ENT_QUOTES, 'UTF-8'); ?>"
                          data-reference-outlets="<?php echo htmlspecialchars(json_encode($mapOutlets, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), ENT_QUOTES, 'UTF-8'); ?>">
-                        <img id="floor-plan-svg" class="floor-plan-svg" alt="Stockwerksplan">
                         <svg id="floor-plan-overlay" class="floor-plan-overlay" viewBox="0 0 1 1" preserveAspectRatio="xMidYMid meet" aria-hidden="true"></svg>
                     </div>
-                    <p class="floor-plan-hint">Nur das aktuell bearbeitete Patchpanel ist verschiebbar. Andere Objekte werden als Referenz halbtransparent angezeigt. Neue Objekte starten bei Position 30 x 30.</p>
+                    <p class="floor-plan-hint">Nur das aktuell bearbeitete Patchpanel ist verschiebbar. Andere Objekte werden als Referenz halbtransparent angezeigt. Neue Objekte starten bei Position 30 x 30. Zoom mit Mausrad, verschieben mit Shift + Drag.</p>
                     <p class="floor-plan-position">Koordinate: <span id="floor-plan-position"></span></p>
                 </div>
             </div>
@@ -255,6 +306,38 @@ $mapOutlets = $sql->get(
                 </select>
             </div>
 
+            <div class="form-group">
+                <label for="outlet-bind-patchpanel-port-id">Direkt mit Patchpanel-Port verbinden</label>
+                <select name="bind_patchpanel_port_id" id="outlet-bind-patchpanel-port-id">
+                    <option value="">- Kein direkter Link -</option>
+                    <?php foreach ($patchpanelPortOptions as $portOption): ?>
+                        <?php
+                            $portId = (int)($portOption['id'] ?? 0);
+                            $isSelected = $selectedBindPatchpanelPortId === $portId;
+                            $isOccupied = ((int)($portOption['is_occupied'] ?? 0) === 1);
+                            $isDisabled = $isOccupied && !$isSelected;
+                            $labelParts = array_filter([
+                                (string)($portOption['floor_name'] ?? ''),
+                                (string)($portOption['patchpanel_name'] ?? ''),
+                                (string)($portOption['name'] ?? ''),
+                            ]);
+                            $label = implode(' / ', $labelParts);
+                            if ($isOccupied && !$isSelected) {
+                                $label .= ' (belegt)';
+                            }
+                        ?>
+                        <option
+                            value="<?php echo $portId; ?>"
+                            data-floor-id="<?php echo (int)($portOption['floor_id'] ?? 0); ?>"
+                            <?php echo $isSelected ? 'selected' : ''; ?>
+                            <?php echo $isDisabled ? 'disabled' : ''; ?>>
+                            <?php echo htmlspecialchars($label); ?>
+                        </option>
+                    <?php endforeach; ?>
+                </select>
+                <small>Nur Ports vom gewaehlten Stockwerk sind auswaehlbar. Beim Speichern wird die Verbindung automatisch erstellt.</small>
+            </div>
+
             <input type="hidden" name="x" value="<?php echo (int)($outlet['x'] ?? 30); ?>">
             <input type="hidden" name="y" value="<?php echo (int)($outlet['y'] ?? 30); ?>">
 
@@ -270,10 +353,9 @@ $mapOutlets = $sql->get(
                          data-active-id="<?php echo (int)($outlet['id'] ?? 0); ?>"
                          data-reference-panels="<?php echo htmlspecialchars(json_encode($mapPatchPanels, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), ENT_QUOTES, 'UTF-8'); ?>"
                          data-reference-outlets="<?php echo htmlspecialchars(json_encode($mapOutlets, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES), ENT_QUOTES, 'UTF-8'); ?>">
-                        <img id="floor-plan-svg" class="floor-plan-svg" alt="Stockwerksplan">
                         <svg id="floor-plan-overlay" class="floor-plan-overlay" viewBox="0 0 1 1" preserveAspectRatio="xMidYMid meet" aria-hidden="true"></svg>
                     </div>
-                    <p class="floor-plan-hint">Nur die aktuell bearbeitete Wandbuchse ist verschiebbar. Blau = Patchpanel, Gruen = Dosen-Referenz, Orange = gewaehlter Raum. Netzwerkdosen sind immer 10 x 10.</p>
+                    <p class="floor-plan-hint">Nur die aktuell bearbeitete Wandbuchse ist verschiebbar. Blau = Patchpanel, Gruen = Dosen-Referenz, Orange = gewaehlter Raum. Netzwerkdosen sind immer 10 x 10. Zoom mit Mausrad, verschieben mit Shift + Drag.</p>
                     <p class="floor-plan-position">Koordinate: <span id="floor-plan-position"></span></p>
                 </div>
             </div>

app/modules/floor_infrastructure/list.php

@@ -180,7 +180,14 @@ if ($editorFloor) {
                             <td><?php echo (int)$panel['port_count']; ?></td>
                             <td class="actions">
                                 <a href="?module=floor_infrastructure&action=edit&type=patchpanel&id=<?php echo (int)$panel['id']; ?>" class="button button-small">Bearbeiten</a>
-                                <a href="?module=floor_infrastructure&action=delete&type=patchpanel&id=<?php echo (int)$panel['id']; ?>" class="button button-small button-danger" onclick="return confirm('Patchpanel wirklich loeschen?');">Loeschen</a>
+                                <button
+                                    type="button"
+                                    class="button button-small button-danger js-floor-infra-delete"
+                                    data-delete-id="<?php echo (int)$panel['id']; ?>"
+                                    data-delete-type="patchpanel"
+                                    data-delete-label="<?php echo htmlspecialchars((string)$panel['name'], ENT_QUOTES, 'UTF-8'); ?>">
+                                    Loeschen
+                                </button>
                             </td>
                         </tr>
                     <?php endforeach; ?>
@@ -226,7 +233,14 @@ if ($editorFloor) {
                             <td><?php echo htmlspecialchars((string)($outlet['comment'] ?? '')); ?></td>
                             <td class="actions">
                                 <a href="?module=floor_infrastructure&action=edit&type=outlet&id=<?php echo (int)$outlet['id']; ?>" class="button button-small">Bearbeiten</a>
-                                <a href="?module=floor_infrastructure&action=delete&type=outlet&id=<?php echo (int)$outlet['id']; ?>" class="button button-small button-danger" onclick="return confirm('Wandbuchse wirklich loeschen?');">Loeschen</a>
+                                <button
+                                    type="button"
+                                    class="button button-small button-danger js-floor-infra-delete"
+                                    data-delete-id="<?php echo (int)$outlet['id']; ?>"
+                                    data-delete-type="outlet"
+                                    data-delete-label="<?php echo htmlspecialchars((string)$outlet['name'], ENT_QUOTES, 'UTF-8'); ?>">
+                                    Loeschen
+                                </button>
                             </td>
                         </tr>
                     <?php endforeach; ?>
@@ -237,3 +251,38 @@ if ($editorFloor) {
         <?php endif; ?>
     </section>
 </div>
+
+<script>
+document.addEventListener('DOMContentLoaded', () => {
+    document.querySelectorAll('.js-floor-infra-delete').forEach((button) => {
+        button.addEventListener('click', () => {
+            const id = Number(button.dataset.deleteId || '0');
+            const type = (button.dataset.deleteType || '').trim();
+            const label = button.dataset.deleteLabel || 'Objekt';
+            if (id <= 0 || (type !== 'patchpanel' && type !== 'outlet')) {
+                return;
+            }
+
+            const entityLabel = type === 'patchpanel' ? 'Patchpanel' : 'Wandbuchse';
+            if (!confirm(entityLabel + ' "' + label + '" wirklich loeschen?')) {
+                return;
+            }
+
+            fetch('?module=floor_infrastructure&action=delete', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
+                body: 'id=' + encodeURIComponent(id) + '&type=' + encodeURIComponent(type)
+            })
+                .then((response) => response.json())
+                .then((data) => {
+                    if (data && data.success) {
+                        window.location.reload();
+                        return;
+                    }
+                    alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
+                })
+                .catch(() => alert('Loeschen fehlgeschlagen'));
+        });
+    });
+});
+</script>

app/modules/floor_infrastructure/save.php

@@ -20,6 +20,24 @@ if ($type === 'patchpanel') {
     $height = $fixedPanelHeight;
     $portCount = (int)($_POST['port_count'] ?? 0);
     $comment = trim($_POST['comment'] ?? '');
+    $errors = [];
+
+    if ($name === '') {
+        $errors[] = 'Name ist erforderlich';
+    }
+    if ($floorId <= 0) {
+        $errors[] = 'Stockwerk ist erforderlich';
+    }
+    if ($portCount < 0) {
+        $errors[] = 'Port-Anzahl darf nicht negativ sein';
+    }
+    if (!empty($errors)) {
+        $_SESSION['error'] = implode(', ', $errors);
+        $_SESSION['validation_errors'] = $errors;
+        $redirectUrl = $id > 0 ? "?module=floor_infrastructure&action=edit&type=patchpanel&id=$id" : "?module=floor_infrastructure&action=edit&type=patchpanel";
+        header("Location: $redirectUrl");
+        exit;
+    }
 
     $panelId = $id;
 
@@ -55,13 +73,30 @@ if ($type === 'patchpanel') {
             }
         }
     }
+    $_SESSION['success'] = $id > 0 ? 'Patchpanel gespeichert' : 'Patchpanel erstellt';
 } elseif ($type === 'outlet') {
     $name = trim($_POST['name'] ?? '');
     $roomId = (int)($_POST['room_id'] ?? 0);
     $x = (int)($_POST['x'] ?? 0);
     $y = (int)($_POST['y'] ?? 0);
     $comment = trim($_POST['comment'] ?? '');
+    $bindPatchpanelPortId = (int)($_POST['bind_patchpanel_port_id'] ?? 0);
     $outletId = $id;
+    $errors = [];
+
+    if ($name === '') {
+        $errors[] = 'Name ist erforderlich';
+    }
+    if ($roomId <= 0) {
+        $errors[] = 'Raum ist erforderlich';
+    }
+    if (!empty($errors)) {
+        $_SESSION['error'] = implode(', ', $errors);
+        $_SESSION['validation_errors'] = $errors;
+        $redirectUrl = $id > 0 ? "?module=floor_infrastructure&action=edit&type=outlet&id=$id" : "?module=floor_infrastructure&action=edit&type=outlet";
+        header("Location: $redirectUrl");
+        exit;
+    }
 
     if ($id > 0) {
         $sql->set(
@@ -92,7 +127,137 @@ if ($type === 'patchpanel') {
                 [$outletId]
             );
         }
+
+        if ($bindPatchpanelPortId > 0) {
+            $roomFloorId = (int)($sql->single(
+                "SELECT floor_id FROM rooms WHERE id = ?",
+                "i",
+                [$roomId]
+            )['floor_id'] ?? 0);
+
+            $patchpanelPort = $sql->single(
+                "SELECT
+                    fpp.id,
+                    fp.floor_id
+                 FROM floor_patchpanel_ports fpp
+                 JOIN floor_patchpanels fp ON fp.id = fpp.patchpanel_id
+                 WHERE fpp.id = ?",
+                "i",
+                [$bindPatchpanelPortId]
+            );
+
+            if (!$patchpanelPort) {
+                $_SESSION['error'] = 'Gewaehlter Patchpanel-Port existiert nicht';
+                $_SESSION['validation_errors'] = ['Gewaehlter Patchpanel-Port existiert nicht'];
+                header('Location: ?module=floor_infrastructure&action=edit&type=outlet&id=' . $outletId);
+                exit;
+            }
+
+            if ($roomFloorId <= 0 || (int)$patchpanelPort['floor_id'] !== $roomFloorId) {
+                $_SESSION['error'] = 'Patchpanel-Port und Raum muessen auf demselben Stockwerk liegen';
+                $_SESSION['validation_errors'] = ['Patchpanel-Port und Raum muessen auf demselben Stockwerk liegen'];
+                header('Location: ?module=floor_infrastructure&action=edit&type=outlet&id=' . $outletId);
+                exit;
+            }
+
+            $outletPortId = (int)($sql->single(
+                "SELECT id
+                 FROM network_outlet_ports
+                 WHERE outlet_id = ?
+                 ORDER BY id
+                 LIMIT 1",
+                "i",
+                [$outletId]
+            )['id'] ?? 0);
+
+            if ($outletPortId <= 0) {
+                $_SESSION['error'] = 'Wandbuchsen-Port konnte nicht ermittelt werden';
+                $_SESSION['validation_errors'] = ['Wandbuchsen-Port konnte nicht ermittelt werden'];
+                header('Location: ?module=floor_infrastructure&action=edit&type=outlet&id=' . $outletId);
+                exit;
+            }
+
+            $existingPatchpanelUsage = $sql->single(
+                "SELECT
+                    id,
+                    port_a_type,
+                    port_a_id,
+                    port_b_type,
+                    port_b_id
+                 FROM connections
+                 WHERE
+                    ((port_a_type = 'patchpanel' OR port_a_type = 'floor_patchpanel_ports') AND port_a_id = ?)
+                    OR
+                    ((port_b_type = 'patchpanel' OR port_b_type = 'floor_patchpanel_ports') AND port_b_id = ?)
+                 LIMIT 1",
+                "ii",
+                [$bindPatchpanelPortId, $bindPatchpanelPortId]
+            );
+
+            if ($existingPatchpanelUsage) {
+                $sameOutletConnection = (
+                    (
+                        (($existingPatchpanelUsage['port_a_type'] ?? '') === 'outlet' || ($existingPatchpanelUsage['port_a_type'] ?? '') === 'network_outlet_ports')
+                        && (int)($existingPatchpanelUsage['port_a_id'] ?? 0) === $outletPortId
+                    )
+                    ||
+                    (
+                        (($existingPatchpanelUsage['port_b_type'] ?? '') === 'outlet' || ($existingPatchpanelUsage['port_b_type'] ?? '') === 'network_outlet_ports')
+                        && (int)($existingPatchpanelUsage['port_b_id'] ?? 0) === $outletPortId
+                    )
+                );
+
+                if (!$sameOutletConnection) {
+                    $_SESSION['error'] = 'Gewaehlter Patchpanel-Port ist bereits verbunden';
+                    $_SESSION['validation_errors'] = ['Gewaehlter Patchpanel-Port ist bereits verbunden'];
+                    header('Location: ?module=floor_infrastructure&action=edit&type=outlet&id=' . $outletId);
+                    exit;
+                }
+            }
+
+            $sql->set(
+                "DELETE FROM connections
+                 WHERE
+                    ((port_a_type = 'outlet' OR port_a_type = 'network_outlet_ports') AND port_a_id = ? AND (port_b_type = 'patchpanel' OR port_b_type = 'floor_patchpanel_ports'))
+                    OR
+                    ((port_b_type = 'outlet' OR port_b_type = 'network_outlet_ports') AND port_b_id = ? AND (port_a_type = 'patchpanel' OR port_a_type = 'floor_patchpanel_ports'))",
+                "ii",
+                [$outletPortId, $outletPortId]
+            );
+
+            $connectionTypeId = (int)($sql->single(
+                "SELECT id FROM connection_types ORDER BY id LIMIT 1",
+                "",
+                []
+            )['id'] ?? 0);
+            if ($connectionTypeId <= 0) {
+                $connectionTypeId = (int)$sql->set(
+                    "INSERT INTO connection_types (name, medium, duplex, line_style, comment) VALUES (?, ?, ?, ?, ?)",
+                    "sssss",
+                    ['Default', 'copper', 'custom', 'solid', 'Auto-created by floor_infrastructure/save'],
+                    true
+                );
+            }
+
+            if ($connectionTypeId <= 0) {
+                $_SESSION['error'] = 'Kein Verbindungstyp fuer automatische Bindung verfuegbar';
+                $_SESSION['validation_errors'] = ['Kein Verbindungstyp fuer automatische Bindung verfuegbar'];
+                header('Location: ?module=floor_infrastructure&action=edit&type=outlet&id=' . $outletId);
+                exit;
+            }
+
+            $sql->set(
+                "INSERT INTO connections (connection_type_id, port_a_type, port_a_id, port_b_type, port_b_id, vlan_config, comment)
+                 VALUES (?, 'outlet', ?, 'patchpanel', ?, NULL, ?)",
+                "iiis",
+                [$connectionTypeId, $outletPortId, $bindPatchpanelPortId, 'Auto-Link bei Wandbuchsen-Erstellung']
+            );
+        }
     }
+    $_SESSION['success'] = $id > 0 ? 'Wandbuchse gespeichert' : 'Wandbuchse erstellt';
+} else {
+    $_SESSION['error'] = 'Ungueltiger Infrastrukturobjekt-Typ';
+    $_SESSION['validation_errors'] = ['Ungueltiger Infrastrukturobjekt-Typ'];
 }
 
 header('Location: ?module=floor_infrastructure&action=list');

app/modules/floors/delete.php

@@ -25,6 +25,47 @@ if (!$exists) {
     exit;
 }
 
+$forceDelete = (int)($_POST['force'] ?? $_GET['force'] ?? 0) === 1;
+$dependencyCounts = $sql->single(
+    "SELECT
+        (SELECT COUNT(*) FROM rooms WHERE floor_id = ?) AS room_count,
+        (SELECT COUNT(*) FROM racks WHERE floor_id = ?) AS rack_count,
+        (SELECT COUNT(*) FROM floor_patchpanels WHERE floor_id = ?) AS patchpanel_count",
+    "iii",
+    [$id, $id, $id]
+);
+
+$roomCount = (int)($dependencyCounts['room_count'] ?? 0);
+$rackCount = (int)($dependencyCounts['rack_count'] ?? 0);
+$patchpanelCount = (int)($dependencyCounts['patchpanel_count'] ?? 0);
+$hasDependencies = $roomCount > 0 || $rackCount > 0 || $patchpanelCount > 0;
+
+if ($hasDependencies && !$forceDelete) {
+    $parts = [];
+    if ($roomCount > 0) {
+        $parts[] = $roomCount . ' Raeume';
+    }
+    if ($rackCount > 0) {
+        $parts[] = $rackCount . ' Racks';
+    }
+    if ($patchpanelCount > 0) {
+        $parts[] = $patchpanelCount . ' Patchpanels';
+    }
+
+    http_response_code(409);
+    echo json_encode([
+        'success' => false,
+        'requires_force' => true,
+        'message' => 'Beim Loeschen werden abhaengige Daten entfernt (' . implode(', ', $parts) . '). Fortfahren?',
+        'dependencies' => [
+            'rooms' => $roomCount,
+            'racks' => $rackCount,
+            'patchpanels' => $patchpanelCount
+        ]
+    ]);
+    exit;
+}
+
 $rows = $sql->set("DELETE FROM floors WHERE id = ?", "i", [$id]);
 if ($rows === false) {
     http_response_code(500);
@@ -32,5 +73,13 @@ if ($rows === false) {
     exit;
 }
 
-echo json_encode(['success' => true, 'message' => 'Stockwerk geloescht']);
+echo json_encode([
+    'success' => true,
+    'message' => 'Stockwerk geloescht',
+    'dependencies' => [
+        'rooms' => $roomCount,
+        'racks' => $rackCount,
+        'patchpanels' => $patchpanelCount
+    ]
+]);
 

app/modules/floors/list.php

@@ -233,11 +233,20 @@ $buildings = $sql->get("SELECT id, name FROM buildings ORDER BY name", "", []);
 
 <script>
 function confirmDelete(id) {
-    if (confirm('Dieses Stockwerk wirklich loeschen? Alle Raeume und Racks werden geloescht.')) {
+    if (!confirm('Dieses Stockwerk wirklich loeschen?')) {
+        return;
+    }
+
+    const requestDelete = (forceDelete) => {
+        const body = ['id=' + encodeURIComponent(id)];
+        if (forceDelete) {
+            body.push('force=1');
+        }
+
         fetch('?module=floors&action=delete', {
             method: 'POST',
             headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
-            body: 'id=' + encodeURIComponent(id)
+            body: body.join('&')
         })
             .then((res) => res.json())
             .then((data) => {
@@ -245,12 +254,22 @@ function confirmDelete(id) {
                     window.location.reload();
                     return;
                 }
+
+                if (data && data.requires_force) {
+                    if (confirm(data.message || 'Abhaengige Daten ebenfalls loeschen?')) {
+                        requestDelete(true);
+                    }
+                    return;
+                }
+
                 alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
             })
             .catch(() => {
                 alert('Loeschen fehlgeschlagen');
             });
-    }
+    };
+
+    requestDelete(false);
 }
 </script>
 

app/modules/floors/save.php

@@ -37,6 +37,7 @@ if ($buildingId <= 0) {
 // Falls Fehler: zurück zum Edit-Formular
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirectUrl = $floorId ? "?module=floors&action=edit&id=$floorId" : "?module=floors&action=edit";
     header("Location: $redirectUrl");
     exit;
@@ -50,6 +51,7 @@ if ($floorSvgContent !== '') {
     $storedSvgPath = storeSvgEditorContent($sql, $floorId, $floorSvgContent);
     if ($storedSvgPath === false) {
         $_SESSION['error'] = "SVG aus dem Editor konnte nicht gespeichert werden";
+        $_SESSION['validation_errors'] = ["SVG aus dem Editor konnte nicht gespeichert werden"];
         $redirectUrl = $floorId ? "?module=floors&action=edit&id=$floorId" : "?module=floors&action=edit";
         header("Location: $redirectUrl");
         exit;

app/modules/locations/delete.php

@@ -7,6 +7,16 @@
 
 header('Content-Type: application/json; charset=utf-8');
 
+$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
+if ($method !== 'POST') {
+    http_response_code(405);
+    echo json_encode([
+        'success' => false,
+        'message' => 'Methode nicht erlaubt'
+    ]);
+    exit;
+}
+
 $locationId = (int)($_POST['id'] ?? $_GET['id'] ?? 0);
 
 if ($locationId <= 0) {

app/modules/locations/save.php

@@ -20,6 +20,7 @@ if (empty($name)) {
 
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirectUrl = $locationId ? "?module=locations&action=edit&id=$locationId" : "?module=locations&action=edit";
     header("Location: $redirectUrl");
     exit;

app/modules/port_types/delete.php

@@ -0,0 +1,84 @@
+<?php
+/**
+ * app/modules/port_types/delete.php
+ *
+ * Loescht einen Porttyp per AJAX (POST).
+ */
+
+header('Content-Type: application/json; charset=utf-8');
+
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    http_response_code(405);
+    echo json_encode(['success' => false, 'message' => 'Methode nicht erlaubt']);
+    exit;
+}
+
+$portTypeId = (int)($_POST['id'] ?? 0);
+if ($portTypeId <= 0) {
+    http_response_code(400);
+    echo json_encode(['success' => false, 'message' => 'Ungueltige Porttyp-ID']);
+    exit;
+}
+
+$portType = $sql->single(
+    "SELECT id, name FROM port_types WHERE id = ?",
+    "i",
+    [$portTypeId]
+);
+
+if (!$portType) {
+    http_response_code(404);
+    echo json_encode(['success' => false, 'message' => 'Porttyp nicht gefunden']);
+    exit;
+}
+
+$usage = $sql->single(
+    "SELECT
+        (SELECT COUNT(*) FROM device_type_ports WHERE port_type_id = ?) AS device_type_ports_count,
+        (SELECT COUNT(*) FROM device_ports WHERE port_type_id = ?) AS device_ports_count,
+        (SELECT COUNT(*) FROM module_ports WHERE port_type_id = ?) AS module_ports_count,
+        (SELECT COUNT(*) FROM network_outlet_ports WHERE port_type_id = ?) AS outlet_ports_count,
+        (SELECT COUNT(*) FROM floor_patchpanel_ports WHERE port_type_id = ?) AS patchpanel_ports_count",
+    "iiiii",
+    [$portTypeId, $portTypeId, $portTypeId, $portTypeId, $portTypeId]
+);
+
+$references = [
+    'Geraetetyp-Ports' => (int)($usage['device_type_ports_count'] ?? 0),
+    'Geraete-Ports' => (int)($usage['device_ports_count'] ?? 0),
+    'Modul-Ports' => (int)($usage['module_ports_count'] ?? 0),
+    'Netzwerkdosen-Ports' => (int)($usage['outlet_ports_count'] ?? 0),
+    'Patchpanel-Ports' => (int)($usage['patchpanel_ports_count'] ?? 0),
+];
+
+$inUse = array_filter($references, static fn ($count) => $count > 0);
+if (!empty($inUse)) {
+    $parts = [];
+    foreach ($inUse as $label => $count) {
+        $parts[] = $label . ': ' . $count;
+    }
+    http_response_code(409);
+    echo json_encode([
+        'success' => false,
+        'message' => 'Porttyp wird noch verwendet (' . implode(', ', $parts) . ')'
+    ]);
+    exit;
+}
+
+$deleted = $sql->set(
+    "DELETE FROM port_types WHERE id = ?",
+    "i",
+    [$portTypeId]
+);
+
+if ($deleted <= 0) {
+    http_response_code(500);
+    echo json_encode(['success' => false, 'message' => 'Porttyp konnte nicht geloescht werden']);
+    exit;
+}
+
+echo json_encode([
+    'success' => true,
+    'message' => 'Porttyp geloescht: ' . (string)$portType['name']
+]);
+exit;

app/modules/port_types/edit.php

@@ -23,20 +23,11 @@ $isEdit = !empty($portType);
 $pageTitle = $isEdit ? "Porttyp bearbeiten: " . htmlspecialchars($portType['name']) : "Neuen Porttyp anlegen";
 $mediaOptions = ['copper' => 'Kupfer', 'fiber' => 'Lichtwelle', 'coax' => 'Koax', 'other' => 'Sonstiges'];
 
-$error = $_SESSION['error'] ?? '';
-unset($_SESSION['error']);
-
 ?>
 
 <div class="port-type-edit">
     <h1><?php echo $pageTitle; ?></h1>
 
-    <?php if ($error): ?>
-    <div class="error-message">
-        <?php echo htmlspecialchars($error); ?>
-    </div>
-    <?php endif; ?>
-
     <form method="post" action="?module=port_types&action=save" class="edit-form">
 
         <?php if ($isEdit): ?>
@@ -157,12 +148,4 @@ unset($_SESSION['error']);
     opacity: 0.8;
 }
 
-.error-message {
-    background: #ffe3e3;
-    color: #a73737;
-    border: 1px solid #f5c2c2;
-    padding: 10px;
-    border-radius: 4px;
-    margin-bottom: 15px;
-}
 </style>

app/modules/port_types/list.php

@@ -34,20 +34,11 @@ $portTypes = $sql->get(
     $params
 );
 
-$success = $_SESSION['success'] ?? '';
-unset($_SESSION['success']);
-
 ?>
 
 <div class="port-types-container">
     <h1>Porttypen</h1>
 
-    <?php if ($success): ?>
-    <div class="success-message">
-        <?php echo htmlspecialchars($success); ?>
-    </div>
-    <?php endif; ?>
-
     <div class="toolbar">
         <form method="GET" class="filter-form">
             <input type="hidden" name="module" value="port_types">
@@ -78,6 +69,13 @@ unset($_SESSION['success']);
                 <td><small><?php echo htmlspecialchars($pt['comment'] ?? ''); ?></small></td>
                 <td class="actions">
                     <a href="?module=port_types&action=edit&id=<?php echo (int)$pt['id']; ?>" class="button button-small">Bearbeiten</a>
+                    <button
+                        type="button"
+                        class="button button-small button-danger js-port-type-delete"
+                        data-port-type-id="<?php echo (int)$pt['id']; ?>"
+                        data-port-type-name="<?php echo htmlspecialchars((string)$pt['name'], ENT_QUOTES, 'UTF-8'); ?>">
+                        Loeschen
+                    </button>
                 </td>
             </tr>
             <?php endforeach; ?>
@@ -164,8 +162,7 @@ unset($_SESSION['success']);
     font-weight: bold;
 }
 
-.empty-state,
-.success-message {
+.empty-state {
     margin: 20px 0;
     padding: 15px;
     border-radius: 6px;
@@ -177,13 +174,40 @@ unset($_SESSION['success']);
     text-align: center;
 }
 
-.success-message {
-    background: #e9f8f1;
-    border: 1px solid #c7eedc;
-    color: #2c7d59;
-}
-
 .actions {
     white-space: nowrap;
 }
 </style>
+
+<script>
+document.addEventListener('DOMContentLoaded', () => {
+    document.querySelectorAll('.js-port-type-delete').forEach((button) => {
+        button.addEventListener('click', () => {
+            const id = Number(button.dataset.portTypeId || '0');
+            const name = button.dataset.portTypeName || 'Porttyp';
+            if (id <= 0) {
+                return;
+            }
+
+            if (!confirm('Porttyp "' + name + '" wirklich loeschen?')) {
+                return;
+            }
+
+            fetch('?module=port_types&action=delete', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' },
+                body: 'id=' + encodeURIComponent(id)
+            })
+                .then((response) => response.json())
+                .then((data) => {
+                    if (data && data.success) {
+                        window.location.reload();
+                        return;
+                    }
+                    alert((data && data.message) ? data.message : 'Loeschen fehlgeschlagen');
+                })
+                .catch(() => alert('Loeschen fehlgeschlagen'));
+        });
+    });
+});
+</script>

app/modules/port_types/save.php

@@ -29,6 +29,7 @@ if (!in_array($medium, $allowedMediums, true)) {
 
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirect = $portTypeId ? "?module=port_types&action=edit&id=$portTypeId" : "?module=port_types&action=edit";
     header("Location: $redirect");
     exit;

app/modules/racks/save.php

@@ -40,6 +40,7 @@ if ($heightHe < 1) {
 // Falls Fehler: zurück zum Edit-Formular
 if (!empty($errors)) {
     $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirectUrl = $rackId ? "?module=racks&action=edit&id=$rackId" : "?module=racks&action=edit";
     header("Location: $redirectUrl");
     exit;

app/modules/rooms/save.php

@@ -18,6 +18,15 @@ $comment = trim((string)($_POST['comment'] ?? ''));
 $rawPolygon = trim((string)($_POST['polygon_points'] ?? ''));
 
 if ($name === '' || $floorId <= 0) {
+    $errors = [];
+    if ($name === '') {
+        $errors[] = 'Name ist erforderlich';
+    }
+    if ($floorId <= 0) {
+        $errors[] = 'Stockwerk ist erforderlich';
+    }
+    $_SESSION['error'] = implode(', ', $errors);
+    $_SESSION['validation_errors'] = $errors;
     $redirect = $roomId > 0 ? "?module=rooms&action=edit&id=$roomId" : "?module=rooms&action=edit&floor_id=$floorId";
     header("Location: $redirect");
     exit;
@@ -100,6 +109,7 @@ if (roomsHasPolygonColumn($sql)) {
     }
 }
 
+$_SESSION['success'] = $roomId > 0 ? 'Raum gespeichert' : 'Raum erstellt';
 header('Location: ?module=locations&action=list');
 exit;
 

app/templates/footer.php

@@ -12,21 +12,5 @@
         | Session: <?php echo session_id() !== '' ? 'aktiv' : 'inaktiv'; ?>
     </p>
 </footer>
-
-<?php if (!empty($_SESSION['success']) || !empty($_SESSION['error'])): ?>
-    <script>
-        (function () {
-            const success = <?php echo json_encode($_SESSION['success'] ?? '', JSON_UNESCAPED_UNICODE); ?>;
-            const error = <?php echo json_encode($_SESSION['error'] ?? '', JSON_UNESCAPED_UNICODE); ?>;
-            if (success) {
-                alert(success);
-            }
-            if (error) {
-                alert(error);
-            }
-        })();
-    </script>
-    <?php unset($_SESSION['success'], $_SESSION['error']); ?>
-<?php endif; ?>
 </body>
 </html>

app/templates/header.php

@@ -64,4 +64,60 @@
     </nav>
 </header>
 
+<?php
+$flashMessages = [];
+
+$successMessage = trim((string)($_SESSION['success'] ?? ''));
+if ($successMessage !== '') {
+    $flashMessages[] = [
+        'type' => 'success',
+        'text' => $successMessage,
+    ];
+}
+
+$errorMessage = trim((string)($_SESSION['error'] ?? ''));
+if ($errorMessage !== '') {
+    $flashMessages[] = [
+        'type' => 'error',
+        'text' => $errorMessage,
+    ];
+}
+
+$validationErrors = $_SESSION['validation_errors'] ?? [];
+if (!is_array($validationErrors)) {
+    $validationErrors = [];
+}
+$validationErrors = array_values(array_filter(array_map(static function ($entry) {
+    return trim((string)$entry);
+}, $validationErrors), static function ($entry) {
+    return $entry !== '';
+}));
+
+if (!empty($validationErrors)) {
+    $flashMessages[] = [
+        'type' => 'error',
+        'text' => 'Bitte pruefe die Eingaben:',
+        'details' => $validationErrors,
+    ];
+}
+
+unset($_SESSION['success'], $_SESSION['error'], $_SESSION['validation_errors']);
+?>
+
 <main>
+    <?php if (!empty($flashMessages)): ?>
+        <section class="flash-stack" aria-live="polite">
+            <?php foreach ($flashMessages as $message): ?>
+                <article class="flash-message flash-message--<?php echo htmlspecialchars((string)$message['type']); ?>">
+                    <p class="flash-message__text"><?php echo htmlspecialchars((string)($message['text'] ?? '')); ?></p>
+                    <?php if (!empty($message['details']) && is_array($message['details'])): ?>
+                        <ul class="flash-message__list">
+                            <?php foreach ($message['details'] as $detail): ?>
+                                <li><?php echo htmlspecialchars((string)$detail); ?></li>
+                            <?php endforeach; ?>
+                        </ul>
+                    <?php endif; ?>
+                </article>
+            <?php endforeach; ?>
+        </section>
+    <?php endif; ?>

doc/DATABASE.md

@@ -124,10 +124,10 @@ Die Bühne für Patchpanel-Objekte auf dem Stockwerkplan.
 - Attributes: Panel-Referenz, `name`, `port_type_id`, optionale VLAN- bzw. Status-Attribute.
 - Ports werden über `connections` sowohl mit anderen Patchpanels als auch mit Netzwerkbuchsen (`network_outlet_ports`) oder Gerätports verbunden; dadurch lassen sich Router-Kabel grafisch darstellen.
 
-**TODO**
-- [ ] Floorplan- und CRUD-Module so erweitern, dass Patchpanels als Floor-Objekte verwaltet und deren Ports gepflegt werden können (`floor_patchpanels`, `floor_patchpanel_ports`).
-- [ ] Verbindungen zwischen Patchpanel ↔ Patchpanel und Patchpanel ↔ Netzwerkbuchse standardisiert in der `connections`-Logik abbilden.
-- [ ] UI/CSV/Export/Dokumentation nachziehen, damit Planer sofort sehen, wo die permanent installierten Kabel verlaufen.
+**Status (18. Februar 2026)**
+- [x] Floorplan- und CRUD-Module wurden für Patchpanels als Floor-Objekte inkl. Port-Pflege erweitert (`floor_patchpanels`, `floor_patchpanel_ports`).
+- [x] Verbindungen zwischen Patchpanel ↔ Patchpanel und Patchpanel ↔ Netzwerkbuchse sind in der `connections`-Logik abbildbar.
+- [ ] UI/CSV/Export-Dokumentation weiter ausbauen, damit Planer Kabelverläufe direkt auswerten können.
 
 ---
 

init.sql

@@ -376,7 +376,10 @@ CREATE TABLE `floor_patchpanel_ports` (
   `comment` text DEFAULT NULL
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;
 
--- TODO: Port-Konfiguration (Patchpanel ↔ Patchpanel, Patchpanel ↔ Netzwerkbuchse) wird über die `connections`-Tabelle geregelt.
+-- Port-Regeln fuer Patchpanel-Verbindungen:
+-- 1) `connections.port_a_type` / `connections.port_b_type` nutzen den Wert `patchpanel` fuer IDs aus `floor_patchpanel_ports`.
+-- 2) Patchpanel-Ports duerfen mit Patchpanel-Ports, Netzwerkbuchsen-Ports (`outlet`) oder Geraete-/Modulports verbunden werden.
+-- 3) Die fachliche Validierung erfolgt in den Save-Handlern der Verbindungs-Module; das Schema bleibt polymorph.
 
 -- --------------------------------------------------------