FEATURE #2048: add basics of permissions management

app/Models/Permission.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Permission extends Model
+{
+    protected $fillable = [
+        'string_id',
+        'parent_id',
+        'group',
+        'name',
+    ];
+
+    public function parent() {
+        return $this->hasOne(Permission::class, 'parent_id');
+    }
+}