v3计划内容上传
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@@ -36,7 +36,7 @@ User (Owner A) generates token → Shop scans/confirms (you)
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## Hard rules
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- Redis token: `redeem:token:{token}` TTL 300s
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- Amount: `0 < amount ≤ min(balance, 500)`
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- Amount: direct redeem `0 < amount ≤ total ACTIVE benefit balance`; document redeem `0 < amount ≤ document balance`
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- Transaction + coupon `version` optimistic lock
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- **Never** `prisma.order.update` in redeem module
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