Refactor code structure for improved readability and maintainability

backoffice/app/Models/Sistema.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Sistema extends Model
+{
+    protected $table = 'sistemi';
+
+    protected $fillable = [
+        'codice', 'nome', 'ordine', 'attivo',
+    ];
+
+    protected $casts = [
+        'ordine' => 'integer',
+        'attivo' => 'boolean',
+    ];
+
+    public function modelli(): HasMany
+    {
+        return $this->hasMany(Modello::class);
+    }
+
+    public function scopeAttivi(Builder $query): Builder
+    {
+        return $query->where('attivo', true)->orderBy('ordine')->orderBy('id');
+    }
+}