How do you implement the mechanism of adding a client tag to the database during the loan repayment process?

To add a client tag to the database during loan repayment, the following mechanism is usually implemented:

1. At the moment of processing the loan payment, a client tag (e.g., client ID, payment type, status, etc.) is generated or retrieved in the application's business logic.
2. A transaction is opened to ensure atomicity of the operation.
3. The loan record in the database is updated, adding or modifying the field with the client tag.
4. The transaction is committed, recording the changes.

Example in Java using JDBC:

String updateSql = "UPDATE loans SET client_tag = ? WHERE loan_id = ?";
try (Connection conn = dataSource.getConnection();
     PreparedStatement ps = conn.prepareStatement(updateSql)) {
    conn.setAutoCommit(false);
    ps.setString(1, clientTag);
    ps.setLong(2, loanId);
    ps.executeUpdate();
    conn.commit();
} catch (SQLException e) {
    // error handling and transaction rollback
}

If an ORM (e.g., Hibernate) is used, then the tag update occurs through changing the entity object and saving the changes within a transaction.