OHLC history with window extremes (highest high / lowest low over the window). Crypto via Coinbase (GET /v1/candles?product=ETH-USD&days=30; hourly bars <= 7d, six-hour <= 31d, daily <= 350d). Metals / indices / forex / stocks via ?sym=XAU&cls=Commodities[&quote=USD]. Returns { productId, days, high, low, candles, series: [[startSec, open, high, low, close], ...] } oldest first.

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