Show expiry settlement as index vs strike intrinsic.
Persist settle_index_px and surface formula in trade detail so expiry closes are not mistaken for book fills. Co-authored-by: Cursor <cursoragent@cursor.com>
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## 2026-07-29 — 到期结算展示:指数 / 行权价 / 内在价值
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### 变更
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1. 到期平仓期权价本就是 **内在价值**(`max(指数−K,0)` / Put 对称),不是盘口;详情页补 **结算指数、行权价、内在价值**。
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2. 成交行标注「期权到期结算」;组表落库 `settle_index_px`。
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3. 说明:永续到期时仍按市价平(与策略文档一致)。
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## 2026-07-29 — 持仓卡显示开仓时间 / 持仓时长
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### 变更
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