Updated the proostekrant to work properly again.

app/src/models/User.php

@@ -0,0 +1,34 @@
+<?php
+namespace App\Models;
+
+class User {
+    private static $table = 'users';
+    
+    public static function all() {
+        $db = Database::getInstance();
+        return $db->fetchAll("SELECT * FROM " . self::$table . " WHERE is_active = 1 ORDER BY display_name");
+    }
+    
+    public static function find($id) {
+        $db = Database::getInstance();
+        return $db->fetch("SELECT * FROM " . self::$table . " WHERE id = ?", [$id]);
+    }
+    
+    public static function findByUsername($username) {
+        $db = Database::getInstance();
+        return $db->fetch("SELECT * FROM " . self::$table . " WHERE username = ? AND is_active = 1", [$username]);
+    }
+    
+    public static function getByIds($ids) {
+        if (empty($ids)) return [];
+        
+        $placeholders = implode(',', array_fill(0, count($ids), '?'));
+        $db = Database::getInstance();
+        return $db->fetchAll("SELECT * FROM " . self::$table . " WHERE id IN ({$placeholders}) AND is_active = 1", $ids);
+    }
+    
+    public static function updateProfileImage($userId, $imagePath) {
+        $db = Database::getInstance();
+        return $db->update(self::$table, ['profile_image' => $imagePath], ['id' => $userId]);
+    }
+}