restore composer.json, add mysqli extension

app/Models/Preview.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Preview extends Model
+{
+    protected $table = 'previews';
+
+    protected $guarded = ['id'];
+
+    protected $casts = [
+        'name' => 'array',
+        'characteristics' => 'array',
+        'leader_of_sales' => 'boolean',
+        'popular' => 'boolean',
+    ];
+
+}