refactor: replace custom CRM with Monica fork

app/Models/Account/Invitation.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Models\Account;
+
+use App\Models\User\User;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Notifications\Notifiable;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * @property Account $account
+ * @property User $invitedBy
+ * @property string $invitation_key
+ */
+class Invitation extends Model
+{
+    use Notifiable;
+
+    /**
+     * The attributes that aren't mass assignable.
+     *
+     * @var array<string>|bool
+     */
+    protected $guarded = ['id'];
+
+    /**
+     * Get the account record associated with the invitation.
+     *
+     * @return BelongsTo
+     */
+    public function account()
+    {
+        return $this->belongsTo(Account::class);
+    }
+
+    /**
+     * Get the contact record associated with the task.
+     *
+     * @return BelongsTo
+     */
+    public function invitedBy()
+    {
+        return $this->belongsTo(User::class, 'invited_by_user_id');
+    }
+}