Transform Legacy Code into Modern Excellence

      *> COBOL Legacy System
       IDENTIFICATION DIVISION.
       PROGRAM-ID. ACCOUNT-MANAGER.
       
       DATA DIVISION.
       01 ACCOUNT-RECORD.
           05 ACCOUNT-NUMBER    PIC 9(10).
           05 ACCOUNT-TYPE      PIC X(10).
           05 ACCOUNT-BALANCE   PIC 9(12)V99.
           05 CUSTOMER-ID       PIC 9(8).

// Modern TypeScript
interface Account {
  accountNumber: string;
  type: AccountType;
  balance: number;
  customerId: string;
}

@Injectable()
export class AccountService {
  constructor(
    @InjectRepository(Account)
    private readonly repo: Repository<Account>
  ) {}

  async createAccount(data: CreateAccountDTO) {
    return this.repo.save(data);
  }
}