effective-dating

A .NET 10 WPF foundation built around effective-period (temporal) data: nothing valid is ever deleted, every record carries the dates it is valid for. Includes a working IAM module on MySQL.

Legacy HR and payroll data migrated into a Workday-shaped target: staged, cleansed, validated, loaded and reconciled to the cent, with every rejection and change traced to a numbered rule. Pure Python + SQLite, zero dependencies, with an interactive replay of the run.

GA(법인보험대리점) 설계사 수수료 계산·지급·환수·정산 엔진 — 규제 변동성을 코드가 아닌 데이터로 흡수한 Java 21/Oracle 시스템 (학습·포트폴리오)

Index versioned rate cards and resolve exactly one applicable rate per SKU and timestamp, or refuse

Bitemporal entity change history for Go — valid time and transaction time, ORM-agnostic over database/sql. Know what your data was, and what you believed it was.