type TFetchOHLCV = (symbol: string, interval: string, since: number, limit: number) => Promise<TRawOHLCV[]>; Copy
type TFetchOHLCV = (symbol: string, interval: string, since: number, limit: number) => Promise<TRawOHLCV[]>;
Raw candle source. since is in milliseconds; must return up to limit candles starting from the first candle >= since.