Fix #19 Set all the ERROR confirmation_key to null in the accounts table

flexiapi/database/migrations/2023_10_09_143939_confirmation_key_nullable_in_accounts_table.php

@@ -0,0 +1,16 @@
+<?php
+
+use App\Account;
+use Illuminate\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    public function up()
+    {
+        Account::withoutGlobalScopes()->where('confirmation_key', 'ERROR')->update(['confirmation_key' => null]);
+    }
+
+    public function down()
+    {
+    }
+};