How should updates to country codes be handled to avoid breaking existing data?

• A. Hard-code the country code values in all consuming applications.
• B. Maintain stable identifiers, implement a country-code mapping layer, and propagate updates through CDC-driven reconciliations.
• C. Ignore changes to country codes and continue using the old values.
• D. Delete all addresses when a code changes.

Answer: (B)

Country-code updates shouldn’t require changing every reference across systems. The best approach is to use stable identifiers that don’t change when the external code does, and add a country-code mapping layer that translates between the external code and the internal representation. When a code is updated, propagate that change through the data ecosystem using CDC-driven reconciliations so downstream systems see the new code in a controlled, auditable way while preserving historical context. This preserves data integrity and history, and avoids the pitfalls of hard-coding values in each application, ignoring updates, or deleting data.