fix db delete data issue

app/Models/StatsModel.php

@@ -1,22 +0,0 @@
-<?php
-
-namespace App\Models;
-
-use CodeIgniter\Model;
-
-class StatsModel extends Model
-{
-    protected $table = 'stats';
-    protected $primaryKey = 'id';
-    protected $allowedFields = [
-        'students', 
-        'teachers', 
-        'admins', 
-        'users'
-    ];
-
-    public function getStats()
-    {
-        return $this->findAll();
-    }
-}