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Free-stockdb is a local quantitative analysis engine designed for the Chinese A-share market. It solves the problem of slow, expensive, and unreliable access to historical stock data (daily K, minute K, ETF) by providing offline caching, incremental updates, and automatic adjustment for splits/dividends. It's built for quantitative traders, researchers, and developers who need fast, reliable, and private batch data queries, backtesting, and technical indicator calculations.