A quantitative backtest framework comparing 5 strategies (BuyHold QQQ / Timing QQQ / Timing QLD / Timing TQQQ / Combo 60-30-10) using QQQ SMA200 as market regime signal with dip-based DCA entry. 基于QQQ SMA200牛熊择时，对比五种策略（买入持有/QQQ择时/QLD择时/TQQQ择时/60-30-10混合组合）的量化回测框架，支持分批回调建仓。
Testfolio-compatible synthetic leveraged-ETF return series for Python, with proper borrow-cost modeling. Calibrated against real TQQQ to within 5%.
Codex Skill for a SPY SMA200 + VIX tiered QQQ/TQQQ allocation monitor with daily Chinese signal reports.
한국투자증권(KIS) Open API 기반 미국 주식 자동매매 봇 — 라오어의 무한매수법 Python 구현 예제 (VWAP, 텔레그램, Docker)
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