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This pull request increases the maximum length for question content to 2000 characters across the JPA entity, DTOs, and database schema. It also lowers the experience thresholds for the AURA, MASTER, and DIAMOND ranking tiers and updates the corresponding assignment logic. Feedback was provided to address a non-deterministic issue in the SQL migration where ROW_NUMBER() is used without a unique secondary sort key, which could lead to inconsistent ranking results for users with identical experience points.
| SELECT | ||
| id, | ||
| total_exp, | ||
| ROW_NUMBER() OVER (ORDER BY total_exp DESC) AS rank |
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total_exp가 동일한 사용자가 여러 명 있을 경우, ROW_NUMBER()의 결과가 실행할 때마다 달라질 수 있는 비결정적(non-deterministic)인 문제가 있습니다. 이는 마이그레이션 결과와 향후 서비스 로직(RankingTierUpdateService) 간의 순위 불일치를 초래할 수 있으므로, id와 같은 고유 컬럼을 보조 정렬 키로 추가하여 순위를 고정하는 것이 좋습니다.
ROW_NUMBER() OVER (ORDER BY total_exp DESC, id ASC) AS rank2 participants
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