1. Test Admin (admin@test.com) with role ID 1
   2. Test Teacher (teacher@test.com) with role ID 5
   3. Test Student (student@test.com) with role ID 3

  The timestamps were added to the Teacher and Student names
  to make them unique, which is fine for our testing
  purposes.

  Let's summarize what we've done:

   1. Created a standalone PHP script (test_users_v1.php) that
      creates test users with predefined roles
   2. The script handles both creating new users and updating
      existing ones
   3. It also handles unique constraint violations by modifying
      user names when necessary
   4. Successfully ran the script to create/update the test
      users
   5. Verified that the users were created correctly with a
      separate verification script

  These test users can now be used for testing the role-based
  features of your application. The credentials are:
   - Admin: admin@test.com / admin123
   - Teacher: teacher@test.com / teacher123
   - Student: student@test.com / student123