#reference-data

Salary tables, salary steps, promotion, retirement age and allowances are set by regulations that keep changing. I read the regulations themselves, store what they change as data with an effective date, and keep the arithmetic in code that cites its legal basis.

A personnel database that never enforced its rules had to become clean data for a new system while the old one kept running. Ordered, repeatable phases behind a read-only door, explicit maps, honest placeholders and a report instead of a crash made that possible.

A Rust service that serves Indonesia's administrative regions — 38 provinces down to 83,768 villages, keyed by the official Ministry of Home Affairs codes — as four cascading lookups with search, so every address form in every project gets the same answer.