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当前策略已经去掉 MACD 过滤，只剩下“趋势 + 无持仓”两个条件： 从 60 根历史 K 线里计算 MA20、MA60，要求最新价 price > MA60 且 MA20 > MA60，确认处于上升趋势。 khHas(data, code) 返回 False（上一交易日收盘时没有这只股票）。 满足后 _calc_buy_ratio 按“现金×95%，但单只股票不超过账户 5%”计算买入比例，并通过 generate_signal(..., "buy") 下单。 没有其他指标过滤，买点完全由均线趋势 + 空仓判断决定 只有拖尾止损这一条： 每个持仓都记录自买入以来的最高价 highest，并计算两条保护线：highest × (1 − TRAIL_DROP_PCT) 与 highest − TRAIL_ATR_MULT × ATR，取更高者作为动态止损价。 只要当前价跌破这条拖尾线，就触发卖出。首次触发只减半仓（PARTIAL_STOP_RATIO = 0.5），若已经减半或再次触发，则把剩余仓位全部卖出。
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