using Backend.MarketDataRequest; namespace Backend.DatabaseHandler { public interface IHistoricalMarketDataCache { Task> GetBarsAsync( string symbol, HistoricalBarSize barSize, HistoricalWhatToShow whatToShow, bool useRth, DateTime startUtc, DateTime endUtc, CancellationToken cancellationToken = default); Task UpsertBarsAsync( IEnumerable bars, CancellationToken cancellationToken = default); } }