OHLC Toolkit

README

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A Polars-native toolkit for reading, validating, and aggregating OHLC (Open, High, Low, Close) market data. Each stage is a separate, composable step: fetch a published dataset, read and validate it, aggregate windows over it, add returns, apply a quality policy. Nothing sorts, fills, interpolates, or de-duplicates your data on the way past. When the data is not what you expected, you get a value describing that — or an exception — rather than a tidied frame and a log line.