diff --git a/.idea/dataSources.xml b/.idea/dataSources.xml
index 701773f..cfd0235 100644
--- a/.idea/dataSources.xml
+++ b/.idea/dataSources.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
-    <data-source source="LOCAL" name="VPS" uuid="f9586db9-d1df-45a2-a60a-9a8716a08fec">
+    <data-source source="LOCAL" name="FSST" uuid="f9586db9-d1df-45a2-a60a-9a8716a08fec">
       <driver-ref>mysql.8</driver-ref>
       <synchronize>true</synchronize>
       <jdbc-driver>com.mysql.cj.jdbc.Driver</jdbc-driver>
diff --git a/lib/bootstrap.php b/lib/bootstrap.php
index e34323c..05c6937 100644
--- a/lib/bootstrap.php
+++ b/lib/bootstrap.php
@@ -1,4 +1,5 @@
 <?php
+
 // Zentraler Bootstrap: muss vor jeglicher HTML-Ausgabe inkludiert werden.
 // - startet die Session genau einmal
 // - setzt sinnvolle PHP-Error-Settings für die Entwicklung
@@ -10,29 +11,39 @@ ini_set('display_errors', '1');
 ini_set('display_startup_errors', '1');
 error_reporting(E_ALL);
 
-if (session_status() !== PHP_SESSION_ACTIVE) {
+if (session_status() !== PHP_SESSION_ACTIVE)
+{
     session_start();
 }
 
 // Rollen bei jedem Request aus der DB aktualisieren
-if (!empty($_SESSION['user_id'])) {
+if (!empty($_SESSION['user_id']))
+{
     $__bsConn = db_connect();
-    $__bsStmt = $__bsConn->prepare(
-        'SELECT r.name FROM userRoles ur JOIN roles r ON r.roleID = ur.roleID WHERE ur.userID = ?'
-    );
-    if ($__bsStmt) {
+    $__bsStmt = $__bsConn->prepare('SELECT r.name FROM userRoles ur JOIN roles r ON r.roleID = ur.roleID WHERE ur.userID = ?');
+
+    if ($__bsStmt)
+    {
         $__bsUid = (int)$_SESSION['user_id'];
         $__bsStmt->bind_param('i', $__bsUid);
         $__bsStmt->execute();
         $__bsResult = $__bsStmt->get_result();
         $_SESSION['user_roles'] = [];
-        while ($__bsRow = $__bsResult->fetch_assoc()) {
+
+        while ($__bsRow = $__bsResult->fetch_assoc())
+        {
             $_SESSION['user_roles'][] = $__bsRow['name'];
         }
+
         $__bsStmt->close();
     }
+
     $__bsConn->close();
-} else {
+}
+else
+{
     $_SESSION['user_roles'] = [];
 }
 
+?>
+
diff --git a/lib/config.php b/lib/config.php
index 776b061..3f57003 100644
--- a/lib/config.php
+++ b/lib/config.php
@@ -1,6 +1,5 @@
 <?php
 // Zentrale Konfiguration
-// Hinweis: In Produktion idealerweise per Environment-Variablen setzen.
 
 declare(strict_types=1);
 
diff --git a/lib/db.php b/lib/db.php
index cc76c78..0d8b52e 100644
--- a/lib/db.php
+++ b/lib/db.php
@@ -1,6 +1,6 @@
 <?php
 
-declare(strict_types=1);
+declare(strict_types=1); // Erzwingt strikte Typenprüfung für Parameter und Rückgabewerte -> keine automatische Typenumwandlung
 
 /**
  * Liefert eine MySQLi-Verbindung anhand der zentralen Konfiguration.
@@ -11,7 +11,9 @@ declare(strict_types=1);
 function db_connect(): mysqli
 {
     static $cfg;
-    if ($cfg === null) {
+
+    if ($cfg === null)
+    {
         /** @var array{db: array{host:string,port:int,user:string,pass:string,name:string,charset:string}} $cfg */
         $cfg = require __DIR__ . '/config.php';
     }
@@ -19,7 +21,9 @@ function db_connect(): mysqli
     $db = $cfg['db'];
 
     $conn = new mysqli($db['host'], $db['user'], $db['pass'], $db['name'], $db['port']);
-    if ($conn->connect_error) {
+
+    if ($conn->connect_error)
+    {
         http_response_code(500);
         die('Datenbankfehler');
     }
@@ -30,3 +34,4 @@ function db_connect(): mysqli
     return $conn;
 }
 
+?>
diff --git a/lib/strings.php b/lib/strings.php
index c81e35a..444bc81 100644
--- a/lib/strings.php
+++ b/lib/strings.php
@@ -1,4 +1,5 @@
 <?php
+
 // lib/strings.php
 // Kleine String-Helper ohne harte Abhängigkeit von mbstring.
 // Ziel: Längenvalidierung möglichst „zeichenbasiert“ und UTF-8-tauglich.
@@ -12,6 +13,7 @@
  * 3) UTF-8 Codepoint-Zählung via PCRE
  * 4) Fallback: strlen (Bytes)
  */
+
 function str_length(string $s): int
 {
     if (function_exists('mb_strlen'))
@@ -22,6 +24,7 @@ function str_length(string $s): int
     if (function_exists('grapheme_strlen'))
     {
         $len = grapheme_strlen($s);
+
         if ($len !== false)
         {
             return (int)$len;
@@ -31,6 +34,7 @@ function str_length(string $s): int
     // UTF-8 Codepoints zählen (best-effort ohne Extensions)
     $m = [];
     $ok = @preg_match_all('/./us', $s, $m);
+
     if ($ok !== false)
     {
         return (int)$ok;