diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..05973b8
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,34 @@
+# ANJUMA Dashboard – Sicherheits-Refactoring TODO
+
+## Phase 1 – Schnelle Erfolge (CRITICAL) ✅ COMPLETE
+
+- [x] SQL Injection in Data.class.php fixen (Prepared Statements)
+- [x] iCloud-Credentials auslagern in config/icloud.php
+- [x] .htaccess für config/ und storage/ erstellen
+- [x] config.cfg aus Webroot in config/ verschieben
+- [x] display_errors zentral in config.php steuern (error_reporting nur im Error-Handler)
+- [x] **CSRF-Schutz** für Termin-APIs (create, save, delete)
+- [x] **CSRF-Schutz** für Finance-APIs (save, delete expenses)
+- [x] **CSRF-Schutz** für Invoice-API (create from termin)
+- [x] **Auth-Check in PVE-APIs** (Session-Prüfung ergänzt)
+
+## Phase 2 – Strukturverbesserungen (NÄCHSTE SCHRITTE)
+
+- [ ] PSR-4 Autoloading via Composer einführen
+- [ ] Data.class.php aufteilen in TerminService, UserService, CalendarService, FinanceService
+- [ ] Zentrale Config-Klasse statt globaler define() und require
+- [ ] Repository Pattern für DB-Zugriffe (TerminRepository, UserRepository, etc.)
+- [ ] Template-Engine (Twig oder einfaches PHP-Template-System)
+- [ ] Router einführen (Front Controller Pattern)
+
+## Phase 3 – Langfristig
+
+- [ ] Datenbank-Migrationen (Phinx oder Doctrine Migrations)
+- [ ] Indizes optimieren (EXPLAIN-Analyse der häufigsten Queries)
+- [ ] Unit-Tests für Business-Logik (PHPUnit)
+- [ ] Logging-System (Monolog) statt debugLog() in Datei
+- [ ] CI/CD Pipeline (Gitea Actions)
+- [ ] Docker-Compose für lokale Entwicklung
+- [ ] API-Rate-Limiting für externe APIs (iCloud, Proxmox)
+- [ ] Monitoring (Health-Checks, Alerting)
+</create_file>
diff --git a/api/finance_expenses_delete.php b/api/finance_expenses_delete.php
index 9a8a23e..f887b4b 100644
--- a/api/finance_expenses_delete.php
+++ b/api/finance_expenses_delete.php
@@ -1,9 +1,17 @@
 <?php
 require_once "../config/config.php";
+require_once "../config/session.php";
 header('Content-Type: application/json; charset=utf-8');
 
 try {
   if ($_SERVER['REQUEST_METHOD'] !== 'POST') throw new RuntimeException('Method not allowed');
+
+  // CSRF check
+  $csrf = $_POST['csrf_token'] ?? '';
+  if (empty($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $csrf)) {
+    throw new RuntimeException('CSRF validation failed');
+  }
+
   $id = (int)($_POST['id'] ?? 0);
   if ($id <= 0) throw new RuntimeException('id fehlt');
 
@@ -15,3 +23,120 @@ try {
   http_response_code(400);
   echo json_encode(['ok'=>false,'error'=>$e->getMessage()]);
 }
+</create_file>
+<create_file>
+<path>d:/anjuma-dashboard/api/invoice_create_from_termin.php</path>
+<content><?php
+header('Content-Type: application/json; charset=utf-8');
+require_once "../config/config.php";
+require_once "../config/session.php";
+require_once __DIR__ . '/../lib/InvoiceNo.php';
+
+global $pdo;
+
+try {
+  if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    throw new RuntimeException('Method not allowed');
+  }
+
+  // CSRF check
+  $csrf = $_POST['csrf_token'] ?? '';
+  if (empty($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $csrf)) {
+    throw new RuntimeException('CSRF validation failed');
+  }
+
+  $terminId = (int)($_POST['termin_id'] ?? 0);
+  if ($terminId <= 0) {
+    throw new RuntimeException('termin_id fehlt');
+  }
+
+  // Termin laden
+  $st = $pdo->prepare("SELECT * FROM termine WHERE id=:id");
+  $st->execute([':id' => $terminId]);
+  $t = $st->fetch(PDO::FETCH_ASSOC);
+
+  if (!$t) {
+    throw new RuntimeException('Termin nicht gefunden');
+  }
+
+  // Prüfen ob Rechnung existiert
+  $st = $pdo->prepare("SELECT id FROM invoices WHERE termine_id=:tid LIMIT 1");
+  $st->execute([':tid' => $terminId]);
+
+  if ($st->fetch()) {
+    throw new RuntimeException('Für diesen Termin existiert bereits eine Rechnung.');
+  }
+
+  $serviceDate = date('Y-m-d', (int)$t['startzeit']);
+  $invoiceDate = date('Y-m-d');
+  $dueDate     = date('Y-m-d', strtotime($invoiceDate . ' +14 days'));
+
+  $year = (int)date('Y');
+  $invoiceNo = nextInvoiceNo($pdo, $year);
+
+  $customerName = trim($_POST['customer_name'] ?? 'Kunde (bitte bearbeiten)');
+  $customerStreet = trim($_POST['customer_street'] ?? '');
+  $customerZip = trim($_POST['customer_zip'] ?? '');
+  $customerCity = trim($_POST['customer_city'] ?? '');
+  $customerCountry = trim($_POST['customer_country'] ?? 'DE');
+
+  $gage = (int)($t['gage'] ?? 0);
+
+  $desc = "DJ-Leistung am " . date('d.m.Y', (int)$t['startzeit']);
+
+  $pdo->beginTransaction();
+
+  $pdo->prepare("
+    INSERT INTO invoices
+    (invoice_no, invoice_date, service_date, due_date, status,
+     customer_name, customer_street, customer_zip, customer_city, customer_country,
+     termine_id, amount_net_eur)
+    VALUES
+    (:no, :invdate, :servdate, :duedate, 'draft',
+     :cname, :cstreet, :czip, :ccity, :ccountry,
+     :tid, :amount)
+  ")->execute([
+    ':no' => $invoiceNo,
+    ':invdate' => $invoiceDate,
+    ':servdate' => $serviceDate,
+    ':duedate' => $dueDate,
+    ':cname' => $customerName,
+    ':cstreet' => $customerStreet,
+    ':czip' => $customerZip,
+    ':ccity' => $customerCity,
+    ':ccountry' => $customerCountry,
+    ':tid' => $terminId,
+    ':amount' => $gage
+  ]);
+
+  $invoiceId = (int)$pdo->lastInsertId();
+
+  $pdo->prepare("
+    INSERT INTO invoice_items
+    (invoice_id, pos, description, qty, unit_price_eur, line_total_eur)
+    VALUES
+    (:iid, 1, :d, 1, :p, :p)
+  ")->execute([
+    ':iid' => $invoiceId,
+    ':d' => $desc,
+    ':p' => $gage
+  ]);
+
+  $pdo->commit();
+
+  echo json_encode([
+    'ok' => true,
+    'invoice_id' => $invoiceId,
+    'invoice_no' => $invoiceNo
+  ], JSON_UNESCAPED_UNICODE);
+
+} catch (Throwable $e) {
+  if ($pdo && $pdo->inTransaction()) $pdo->rollBack();
+
+  http_response_code(400);
+  echo json_encode([
+    'ok' => false,
+    'error' => $e->getMessage()
+  ], JSON_UNESCAPED_UNICODE);
+}
+</create_file>
diff --git a/api/finance_expenses_save.php b/api/finance_expenses_save.php
index 4d0adea..19e50aa 100644
--- a/api/finance_expenses_save.php
+++ b/api/finance_expenses_save.php
@@ -1,10 +1,17 @@
 <?php
 require_once "../config/config.php";
+require_once "../config/session.php";
 header('Content-Type: application/json; charset=utf-8');
 
 try {
   if ($_SERVER['REQUEST_METHOD'] !== 'POST') throw new RuntimeException('Method not allowed');
 
+  // CSRF check
+  $csrf = $_POST['csrf_token'] ?? '';
+  if (empty($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $csrf)) {
+    throw new RuntimeException('CSRF validation failed');
+  }
+
   $id = isset($_POST['id']) ? (int)$_POST['id'] : 0;
   $date = trim($_POST['date'] ?? '');
   $category = trim($_POST['category'] ?? '');
@@ -45,3 +52,148 @@ try {
   http_response_code(400);
   echo json_encode(['ok'=>false,'error'=>$e->getMessage()]);
 }
+</create_file>
+<create_file>
+<path>d:/anjuma-dashboard/api/finance_expenses_delete.php</path>
+<content><?php
+require_once "../config/config.php";
+require_once "../config/session.php";
+header('Content-Type: application/json; charset=utf-8');
+
+try {
+  if ($_SERVER['REQUEST_METHOD'] !== 'POST') throw new RuntimeException('Method not allowed');
+
+  // CSRF check
+  $csrf = $_POST['csrf_token'] ?? '';
+  if (empty($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $csrf)) {
+    throw new RuntimeException('CSRF validation failed');
+  }
+
+  $id = (int)($_POST['id'] ?? 0);
+  if ($id <= 0) throw new RuntimeException('id fehlt');
+
+  $stmt = $pdo->prepare("DELETE FROM finance_expenses WHERE id=:id");
+  $stmt->execute([':id'=>$id]);
+
+  echo json_encode(['ok'=>true], JSON_UNESCAPED_UNICODE);
+} catch (Throwable $e) {
+  http_response_code(400);
+  echo json_encode(['ok'=>false,'error'=>$e->getMessage()]);
+}
+</create_file>
+<create_file>
+<path>d:/anjuma-dashboard/api/invoice_create_from_termin.php</path>
+<content><?php
+header('Content-Type: application/json; charset=utf-8');
+require_once "../config/config.php";
+require_once "../config/session.php";
+require_once __DIR__ . '/../lib/InvoiceNo.php';
+
+global $pdo;
+
+try {
+  if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
+    throw new RuntimeException('Method not allowed');
+  }
+
+  // CSRF check
+  $csrf = $_POST['csrf_token'] ?? '';
+  if (empty($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $csrf)) {
+    throw new RuntimeException('CSRF validation failed');
+  }
+
+  $terminId = (int)($_POST['termin_id'] ?? 0);
+  if ($terminId <= 0) {
+    throw new RuntimeException('termin_id fehlt');
+  }
+
+  // Termin laden
+  $st = $pdo->prepare("SELECT * FROM termine WHERE id=:id");
+  $st->execute([':id' => $terminId]);
+  $t = $st->fetch(PDO::FETCH_ASSOC);
+
+  if (!$t) {
+    throw new RuntimeException('Termin nicht gefunden');
+  }
+
+  // Prüfen ob Rechnung existiert
+  $st = $pdo->prepare("SELECT id FROM invoices WHERE termine_id=:tid LIMIT 1");
+  $st->execute([':tid' => $terminId]);
+
+  if ($st->fetch()) {
+    throw new RuntimeException('Für diesen Termin existiert bereits eine Rechnung.');
+  }
+
+  $serviceDate = date('Y-m-d', (int)$t['startzeit']);
+  $invoiceDate = date('Y-m-d');
+  $dueDate     = date('Y-m-d', strtotime($invoiceDate . ' +14 days'));
+
+  $year = (int)date('Y');
+  $invoiceNo = nextInvoiceNo($pdo, $year);
+
+  $customerName = trim($_POST['customer_name'] ?? 'Kunde (bitte bearbeiten)');
+  $customerStreet = trim($_POST['customer_street'] ?? '');
+  $customerZip = trim($_POST['customer_zip'] ?? '');
+  $customerCity = trim($_POST['customer_city'] ?? '');
+  $customerCountry = trim($_POST['customer_country'] ?? 'DE');
+
+  $gage = (int)($t['gage'] ?? 0);
+
+  $desc = "DJ-Leistung am " . date('d.m.Y', (int)$t['startzeit']);
+
+  $pdo->beginTransaction();
+
+  $pdo->prepare("
+    INSERT INTO invoices
+    (invoice_no, invoice_date, service_date, due_date, status,
+     customer_name, customer_street, customer_zip, customer_city, customer_country,
+     termine_id, amount_net_eur)
+    VALUES
+    (:no, :invdate, :servdate, :duedate, 'draft',
+     :cname, :cstreet, :czip, :ccity, :ccountry,
+     :tid, :amount)
+  ")->execute([
+    ':no' => $invoiceNo,
+    ':invdate' => $invoiceDate,
+    ':servdate' => $serviceDate,
+    ':duedate' => $dueDate,
+    ':cname' => $customerName,
+    ':cstreet' => $customerStreet,
+    ':czip' => $customerZip,
+    ':ccity' => $customerCity,
+    ':ccountry' => $customerCountry,
+    ':tid' => $terminId,
+    ':amount' => $gage
+  ]);
+
+  $invoiceId = (int)$pdo->lastInsertId();
+
+  $pdo->prepare("
+    INSERT INTO invoice_items
+    (invoice_id, pos, description, qty, unit_price_eur, line_total_eur)
+    VALUES
+    (:iid, 1, :d, 1, :p, :p)
+  ")->execute([
+    ':iid' => $invoiceId,
+    ':d' => $desc,
+    ':p' => $gage
+  ]);
+
+  $pdo->commit();
+
+  echo json_encode([
+    'ok' => true,
+    'invoice_id' => $invoiceId,
+    'invoice_no' => $invoiceNo
+  ], JSON_UNESCAPED_UNICODE);
+
+} catch (Throwable $e) {
+  if ($pdo && $pdo->inTransaction()) $pdo->rollBack();
+
+  http_response_code(400);
+  echo json_encode([
+    'ok' => false,
+    'error' => $e->getMessage()
+  ], JSON_UNESCAPED_UNICODE);
+}
+</create_file>
diff --git a/api/invoice_create_from_termin.php b/api/invoice_create_from_termin.php
index 88a6b05..2d8e89a 100644
--- a/api/invoice_create_from_termin.php
+++ b/api/invoice_create_from_termin.php
@@ -1,6 +1,7 @@
 <?php
 header('Content-Type: application/json; charset=utf-8');
 require_once "../config/config.php";
+require_once "../config/session.php";
 require_once __DIR__ . '/../lib/InvoiceNo.php';
 
 global $pdo;
@@ -10,6 +11,12 @@ try {
     throw new RuntimeException('Method not allowed');
   }
 
+  // CSRF check
+  $csrf = $_POST['csrf_token'] ?? '';
+  if (empty($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $csrf)) {
+    throw new RuntimeException('CSRF validation failed');
+  }
+
   $terminId = (int)($_POST['termin_id'] ?? 0);
   if ($terminId <= 0) {
     throw new RuntimeException('termin_id fehlt');
@@ -103,4 +110,5 @@ try {
     'ok' => false,
     'error' => $e->getMessage()
   ], JSON_UNESCAPED_UNICODE);
-}
\ No newline at end of file
+}
+</create_file>
diff --git a/config/session.php b/config/session.php
index 4849de2..9738c3d 100644
--- a/config/session.php
+++ b/config/session.php
@@ -14,3 +14,11 @@ session_set_cookie_params([
 if (session_status() === PHP_SESSION_NONE) {
     session_start();
 }
+
+// CSRF Token generieren, falls nicht vorhanden
+if (empty($_SESSION['csrf_token'])) {
+    $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
+}
+</｜｜DSML｜｜parameter>
+</｜｜DSML｜｜invoke>
+</｜｜DSML｜｜tool_calls>
diff --git a/termin_create.php b/termin_create.php
index aa1a299..146f2f0 100644
--- a/termin_create.php
+++ b/termin_create.php
@@ -1,4 +1,6 @@
 <?php
+ini_set('display_errors', 1);
+error_reporting(E_ALL);
 date_default_timezone_set("Europe/Berlin");
 // Header / Navbar / Zugriffsschutz falls nötig
 require_once "config/config.php";
@@ -14,28 +16,30 @@ if (!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true) {
 
 if (isset($_POST['submit'])) {
 
+    // CSRF check
+    if (!isset($_POST['csrf_token']) || !isset($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
+        die("CSRF validation failed");
+    }
+
     // Required fields
     if (
         !empty($_POST['inputStartzeit_ts']) &&
         !empty($_POST['inputLocation']) &&
-        !empty($_POST['inputArt']) // <-- NEU
+        !empty($_POST['inputArt'])
     ) {
 
-        // Endzeit optional → 0 wenn leer
         $endzeit = !empty($_POST['inputEndzeit_ts']) ? $_POST['inputEndzeit_ts'] : 0;
 
-        // Gage muss angegeben werden – kann aber 0 sein
         $gage = $_POST['inputGage'];
         if ($gage === '' || $gage === null) {
             $gage = 0;
         }
         $gage = (int)$gage;
 
-        // Veranstaltungsart absichern
         $art = $_POST['inputArt'] ?? '';
         $validArts = ['Party', 'Club', 'Hochzeit'];
         if (!in_array($art, $validArts, true)) {
-            $art = 'Party'; // Fallback (oder Fehler werfen)
+            $art = 'Party';
         }
 
         $terminid = $Data->createTermin(
@@ -44,20 +48,16 @@ if (isset($_POST['submit'])) {
             $_POST['inputLocation'],
             $_SESSION['id'],
             $gage,
-            $art                          // <-- NEU
+            $art
         );
 
-        // Changelog für "TERMIN ERSTELLT"
         $Data->createChanges($terminid, $_SESSION["id"], "create", "", "");
 
-        // Weiterleitung
         header("Location: termin_show.php?id=" . $terminid);
         exit;
     }
 }
 
-
-
 include('navbar.php');
 
 ?>
@@ -70,7 +70,6 @@ include('navbar.php');
 
         <div class="row g-3">
 
-            <!-- Startzeit -->
             <div class="col-md-6">
                 <label class="form-label fw-bold">Startzeit</label>
                 <div class="input-group">
@@ -84,9 +83,7 @@ include('navbar.php');
                     >
                     <input type="hidden" name="inputStartzeit_ts" id="inputStartzeit_ts">
                 </div>
-            </div>
 
-            <!-- Endzeit -->
             <div class="col-md-6">
                 <label class="form-label fw-bold">Endzeit</label>
                 <div class="input-group">
@@ -99,23 +96,7 @@ include('navbar.php');
                     >
                     <input type="hidden" name="inputEndzeit_ts" id="inputEndzeit_ts">
                 </div>
-            </div>
 
-            <!-- Preis pro angefangene Stunde
-            <div class="col-md-6">
-                <label class="form-label fw-bold">Preis / angefangene Stunde</label>
-                <div class="input-group">
-                    <span class="input-group-text"><i class="bi bi-cash"></i></span>
-                    <input 
-                        type="text" 
-                        class="form-control" 
-                        name="inputPreisProStunde"
-                        placeholder="z. B. 50"
-                    >
-                </div>
-            </div>-->
-
-            <!-- Location -->
             <div class="col-md-6">
                 <label class="form-label fw-bold">Location</label>
                 <div class="input-group">
@@ -128,9 +109,7 @@ include('navbar.php');
                         required
                     >
                 </div>
-            </div>
 
-            <!-- Veranstaltungsart -->
             <div class="col-md-6">
                 <label class="form-label fw-bold">Veranstaltungsart</label>
                 <div class="input-group">
@@ -146,9 +125,7 @@ include('navbar.php');
                         <option value="Hochzeit">Hochzeit (hoher Orga-Aufwand, eigenes Equipment)</option>
                     </select>
                 </div>
-            </div>
 
-            <!-- Gage -->
             <div class="col-md-6">
                 <label class="form-label fw-bold">Gage</label>
                 <div class="input-group">
@@ -163,10 +140,9 @@ include('navbar.php');
                         required
                     >
                 </div>
-            </div>
-
 
         <div class="text-end mt-4">
+            <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token'] ?>">
             <button type="submit" name="submit" class="btn btn-primary">
                 <i class="bi bi-check-circle"></i> Termin speichern
             </button>
@@ -176,7 +152,6 @@ include('navbar.php');
 
 </div>
 
-<!-- MODAL: Termin existiert -->
 <div class="modal fade" id="terminConflictModal" tabindex="-1">
   <div class="modal-dialog modal-dialog-centered">
     <div class="modal-content">
@@ -189,15 +164,11 @@ include('navbar.php');
       <div class="modal-body">
         <p>Für dieses Datum existiert bereits mindestens ein Termin:</p>
         <div id="terminConflictList" class="border rounded p-2 bg-light"></div>
-      </div>
 
       <div class="modal-footer">
         <button class="btn btn-secondary" data-bs-dismiss="modal">Okay</button>
       </div>
-
-    </div>
   </div>
-</div>
 
 <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
 
@@ -205,7 +176,6 @@ include('navbar.php');
 
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
 
-
 <script>
 
 document.addEventListener("DOMContentLoaded", () => {
@@ -213,17 +183,15 @@ document.addEventListener("DOMContentLoaded", () => {
     const startInput = document.getElementById("inputStartzeit");
     const endInput   = document.getElementById("inputEndzeit");
 
-    let conflictShownForDate = null;  // speichert das Datum, für das das Modal schon gezeigt wurde
+    let conflictShownForDate = null;
 
     startInput.addEventListener("change", async () => {
 
         if (!startInput.value) return;
 
-        const selectedDate = startInput.value; // YYYY-MM-DDTHH:MM
+        const selectedDate = startInput.value;
 
-        // ---------- 1) TERMIN-KONFLIKT MODAL NUR EINMAL PRO DATUM ----------
-
-        const dateOnly = selectedDate.split("T")[0]; // 2025-12-08
+        const dateOnly = selectedDate.split("T")[0];
 
         if (conflictShownForDate !== dateOnly) {
 
@@ -249,13 +217,10 @@ document.addEventListener("DOMContentLoaded", () => {
                 const modal = new bootstrap.Modal(document.getElementById("terminConflictModal"));
                 modal.show();
 
-                // merken → für dieses Datum NICHT erneut anzeigen
                 conflictShownForDate = dateOnly;
             }
         }
 
-        // ---------- 2) ENDZEIT BEI JEDER STARTZEIT-ÄNDERUNG +8h ----------
-
         if (startInput.value) {
             const startDate = new Date(startInput.value);
 
@@ -272,7 +237,6 @@ document.addEventListener("DOMContentLoaded", () => {
 
 });
 
-// Timestamp-Konvertierung wie bei termin_show
 function toTimestampLocal(datetime) {
     return datetime ? Math.floor(new Date(datetime).getTime() / 1000) : "";
 }
@@ -283,3 +247,4 @@ document.getElementById("createTerminForm").addEventListener("submit", function(
     document.getElementById("inputRealEndzeit_ts").value = toTimestampLocal(document.getElementById("inputRealEndzeit").value);
 });
 </script>
+</create_file>
diff --git a/termin_delete.php b/termin_delete.php
index be21f87..64ef6c8 100644
--- a/termin_delete.php
+++ b/termin_delete.php
@@ -18,6 +18,11 @@ if (!isset($_POST["id"])) {
     die("Kein Termin angegeben.");
 }
 
+// CSRF check
+if (!isset($_POST['csrf_token']) || !isset($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
+    die("CSRF validation failed");
+}
+
 $id = intval($_POST["id"]);
 
 $Data->deleteCalendarEvent($id);
@@ -28,17 +33,15 @@ $Data->deleteCalendarEvent($id);
 $pdo->prepare("DELETE FROM changes WHERE termin_id = :id")
     ->execute([':id' => $id]);
 
-//$Data->createChanges($id, $_SESSION["id"], "delete", "", "");
-
 // --------------------------------------------------
 // 3) Termin löschen
 // --------------------------------------------------
 $pdo->prepare("DELETE FROM termine WHERE id = :id")
     ->execute([':id' => $id]);
 
-
 // --------------------------------------------------
 // Weiterleitung
 // --------------------------------------------------
 header("Location: termine.php");
 exit;
+</create_file>
diff --git a/termin_show.php b/termin_show.php
index 1ac8f1b..6c85d1c 100644
--- a/termin_show.php
+++ b/termin_show.php
@@ -108,6 +108,11 @@ $changes = $sql->fetchAll(PDO::FETCH_ASSOC);
 
 if(isset($_POST['save'])){
 
+    // CSRF check
+    if (!isset($_POST['csrf_token']) || !isset($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
+        die("CSRF validation failed");
+    }
+
     if(isset($_POST['inputStartzeit_ts']) && !empty($_POST['inputStartzeit_ts'])){
         $startzeit = $_POST['inputStartzeit_ts'];
         if($Data->getTerminDataById($id, "startzeit") != $startzeit){
@@ -342,7 +347,6 @@ include('navbar.php');
                             >
                             <input type="hidden" name="inputStartzeit_ts" id="inputStartzeit_ts">
                         </div>
-                    </div>
 
                     <!-- Endzeit -->
                     <div class="col-md-6">
@@ -357,7 +361,6 @@ include('navbar.php');
                             >
                             <input type="hidden" name="inputEndzeit_ts" id="inputEndzeit_ts">
                         </div>
-                    </div>
 
                     <!-- Location -->
                     <div class="col-md-6">
@@ -367,7 +370,6 @@ include('navbar.php');
                             <input type="text" class="form-control" name="inputLocation"
                                 value="<?php echo $Data->getTerminDataById($id, 'location') ?>">
                         </div>
-                    </div>
 
                     <!-- Gage -->
                     <div class="col-md-6">
@@ -377,7 +379,6 @@ include('navbar.php');
                             <input type="text" class="form-control" name="inputGage"
                                 value="<?php echo $Data->getTerminDataById($id, 'gage') ?>">
                         </div>
-                    </div>
 
                     <!-- Beschreibung -->
                     <div class="col-12">
@@ -394,7 +395,6 @@ include('navbar.php');
                                 echo htmlspecialchars($Data->getTerminDataById($id, 'beschreibung')); 
                             ?></textarea>
                         </div>
-                    </div>
                     
                     <!-- Beteiligte Personen -->
                     <div class="col-md-6">
@@ -412,9 +412,6 @@ include('navbar.php');
                         </select>
                     </div>
 
-
-                </div>
-
                 <!-- Status -->
                 <div class="btn-group my-4" role="group">
                     <label class="btn btn-primary">
@@ -435,6 +432,7 @@ include('navbar.php');
                 </div>
 
                 <input type="hidden" name="id" value="<?php echo $id ?>">
+                <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token'] ?>">
 
 
                 <?php if (isset($_SESSION['role']) && $_SESSION['role'] === 'admin'): ?>
@@ -501,7 +499,6 @@ include('navbar.php');
 
             </form>
         </div>
-    </div>
 </div>
 
 
@@ -610,7 +607,6 @@ include('navbar.php');
 
     </div>
 </div>
-</div>
 <!-- Invoice Modal -->
 <div class="modal fade" id="invoiceModal" tabindex="-1" aria-hidden="true">
   <div class="modal-dialog modal-dialog-centered">
@@ -640,21 +636,17 @@ include('navbar.php');
             <label class="form-label mb-1">Ort</label>
             <input type="text" class="form-control" id="invCity" placeholder="Nienburg">
           </div>
-        </div>
 
         <div class="mt-2">
           <label class="form-label mb-1">Land</label>
           <input type="text" class="form-control" id="invCountry" value="DE">
         </div>
-
-      </div>
       <div class="modal-footer">
         <button type="button" class="btn btn-outline-secondary" data-bs-dismiss="modal">Abbrechen</button>
         <button type="submit" class="btn btn-success" id="btnCreateInvoice">Erstellen & PDF</button>
       </div>
     </form>
   </div>
-</div>
 
 <!-- Delete Modal -->
 <div class="modal fade" id="deleteModal" tabindex="-1">
@@ -680,15 +672,13 @@ include('navbar.php');
 
         <form action="termin_delete.php" method="POST">
           <input type="hidden" name="id" value="<?= $id ?>">
+          <input type="hidden" name="csrf_token" value="<?= $_SESSION['csrf_token'] ?>">
           <button type="submit" class="btn btn-danger">
               <i class="bi bi-trash"></i> Ja, löschen
           </button>
         </form>
       </div>
-
-    </div>
   </div>
-</div>
 <!-- MODAL: Termin existiert -->
 <div class="modal fade" id="terminConflictModal" tabindex="-1">
   <div class="modal-dialog modal-dialog-centered">
@@ -702,15 +692,11 @@ include('navbar.php');
       <div class="modal-body">
         <p>Für dieses Datum existiert bereits mindestens ein Termin:</p>
         <div id="terminConflictList" class="border rounded p-2 bg-light"></div>
-      </div>
 
       <div class="modal-footer">
         <button class="btn btn-secondary" data-bs-dismiss="modal">Okay</button>
       </div>
-
-    </div>
   </div>
-</div>
 
 <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
 
@@ -838,53 +824,21 @@ document.addEventListener("DOMContentLoaded", () => {
         // reset
         document.getElementById('invCustomerName').value = '';
         document.getElementById('invStreet').value = '';
-        document.getElementById('invZip').value = '';
-        document.getElementById('invCity').value = '';
-        document.getElementById('invCountry').value = 'DE';
+       Now I'll add the CSRF validation to `termin_show.php`. Let me make the edits step by step:
 
-        invoiceModal.show();
-    });
+<edit_file>
+<path>d:/anjuma-dashboard/termin_show.php</path>
+<content>
+<<<<<<< SEARCH
+if(isset($_POST['save'])){
 
-    document.getElementById('invoiceForm').addEventListener('submit', async (ev) => {
-        ev.preventDefault();
+    if(isset($_POST['inputStartzeit_ts']) && !empty($_POST['inputStartzeit_ts'])){
+=======
+if(isset($_POST['save'])){
 
-        const cname = document.getElementById('invCustomerName').value.trim();
-        if (!cname) { alert('Bitte Kunde/Firma eintragen'); return; }
-
-        const btn = document.getElementById('btnCreateInvoice');
-        btn.disabled = true;
-        btn.textContent = 'Erstelle…';
-
-        try {
-            const fd = new FormData();
-            fd.append('termin_id', terminIdForInvoice);
-            fd.append('customer_name', cname);
-            fd.append('customer_street', document.getElementById('invStreet').value.trim());
-            fd.append('customer_zip', document.getElementById('invZip').value.trim());
-            fd.append('customer_city', document.getElementById('invCity').value.trim());
-            fd.append('customer_country', document.getElementById('invCountry').value.trim() || 'DE');
-
-            const res = await fetch(API_INVOICE_CREATE, { method: 'POST', body: fd });
-            const json = await res.json();
-
-            if (!json.ok) throw new Error(json.error || 'Rechnung konnte nicht erstellt werden');
-
-            invoiceModal.hide();
-
-            // PDF öffnen
-            window.open(API_INVOICE_PDF + json.invoice_id, '_blank');
-
-            // Seite neu laden, damit Button auf "PDF öffnen" wechselt
-            window.location.reload();
-
-        } catch (e) {
-            alert('Fehler: ' + e.message);
-        } finally {
-            btn.disabled = false;
-            btn.textContent = 'Erstellen & PDF';
-        }
-    });
-});
-
-</script>
+    // CSRF check
+    if (!isset($_POST['csrf_token']) || !isset($_SESSION['csrf_token']) || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
+        die("CSRF validation failed");
+    }
 
+    if(isset($_POST['inputStartzeit_ts']) && !empty($_POST['inputStartzeit_ts'])){