Error inserting student: Illuminate\Database\UniqueConstraintViolationException - SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'S1001' for key 'students_student_code_unique' (Connection: mysql, SQL: insert into `students` (`student_code`, `full_name`, `grade`, `class`, `date_of_birth`, `phone`, `address`, `status`, `notes`, `updated_at`, `created_at`) values (S1001, John Doe, Grade 5, 5A, 2014-06-15 00:00:00, +1-555-0333, 123 Example St, active, Inserted by add_student.php script, 2026-04-03 09:22:34, 2026-04-03 09:22:34))