عرض عملي: لوحة متصدرين بالمجموعات المرتّبة

خطوة بخطوة

1. Create key shop:top:week:2026-W44 and record sales with ZINCRBY key 1 productId.
2. Read the top 10 with ZRANGE key 0 9 REV WITHSCORES.
3. Wrap it in a Spring StringRedisTemplate.opsForZSet() service.
4. Set EXPIRE of two weeks so old boards disappear.
5. Planned mistake: store the board as a JSON string and rewrite it on each sale; two concurrent sales overwrite each other. Fix: ZINCRBY, which is atomic.
6. Show rank lookup with ZREVRANK.

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