feat: add all Eloquent models with relationships

app/Models/Approval.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Approval extends Model
+{
+    protected $fillable = ['model_type', 'model_id', 'required_approvals', 'status'];
+
+    public function items(): HasMany
+    {
+        return $this->hasMany(ApprovalItem::class);
+    }
+
+    public function approvable()
+    {
+        return $this->morphTo(__FUNCTION__, 'model_type', 'model_id');
+    }
+}