Files
ga-commission-system/ga-core
GA Pro 44dbbf37da feat(core): ChargebackGrade VO 세트 + Mapper (도메인 P1-3-b)
V28 chargeback_grade와 ga-core 동기화. 차등 환수 비즈니스 로직은 P1-3-c.

신규 패키지: com.ga.core.vo.chargeback, com.ga.core.mapper.chargeback

VO 세트:
- ChargebackGradeVO (BaseVO 상속, monthsFrom/monthsTo NULL=무한대)
- ChargebackGradeResp (productCategoryName + monthsRange 표시 문자열)
- ChargebackGradeSaveReq (@Valid: @Min(0) monthsFrom/percent)
- ChargebackGradeSearchParam (productCategory/monthsElapsed/effectiveDate)

ChargebackGradeMapper:
- 표준 CRUD
- selectByMonths(productCategory, monthsElapsed, baseDate)
  → 해당 경과월에 적용되는 환수 비율 1건 (months_from <= monthsElapsed
    AND (months_to IS NULL OR months_to >= monthsElapsed)) + 유효기간
    + product_category NULL 안전 비교 + LIMIT 1 최신 우선
- selectAll(baseDate) — months_from ASC + product_category NULLS FIRST
- selectByCategory(productCategory, baseDate)

XML 공통 activeCondition SQL fragment로 중복 제거.
2026-05-13 00:53:47 +09:00
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