guke 683eb08be9 docs(coin-ledger): 比价/领券看广告金币按会话汇总设计 spec ...

金币记录列表把一次比价/领券连续看广告的多条金币合并成一条，按 trace_id
聚合。纯后端：coin_transaction 加 trace_id 列 + 回填历史，/coin-transactions
分组游标分页返回合并行。领券自 2026-07-15 起结算已带 trace_id，无需改 Android。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-08-07 14:40:33 +08:00

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