feat: add transaction handling for user registration process

backend/app/Http/Controllers/Auth/RegisteredUserController.php

@@ -8,6 +8,7 @@ use App\Mail\UserRegistrationCompleted;
 use App\Models\Company;
 use App\Models\StudentData;
 use App\Models\User;
+use DB;
 use Illuminate\Auth\Events\Registered;
 use Illuminate\Http\Request;
 use Illuminate\Http\Response;
@@ -46,6 +47,9 @@ class RegisteredUserController extends Controller
             'company_data.hiring' => ['required_if:role,EMPLOYER', 'boolean'],
         ]);
 
+        DB::createTransaction();
+
+        try {
             $user = User::create([
                 'email' => $request->email,
                 'first_name' => $request->first_name,
@@ -73,6 +77,12 @@ class RegisteredUserController extends Controller
                 ]);
             }
 
+            DB::commit();
+        } catch (\Exception $e) {
+            DB::rollBack();
+            throw $e;
+        }
+
         Mail::to($user)->sendNow(new UserRegistrationCompleted($user->name, $password));
         event(new Registered($user));