feat: add private existing business draft foundation

app/Models/ExistingBusinessObject.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Concerns\HasUuids;
+use Illuminate\Database\Eloquent\Model;
+
+class ExistingBusinessObject extends Model
+{
+    use HasUuids;
+
+    protected $guarded = ['id'];
+
+    protected $hidden = ['payload'];
+
+    protected $casts = ['payload' => 'encrypted:array'];
+}