//Get Last Close for kline of symbol-interval combo
public async Task <long> LoadKlineLastUpdate(string symbol, string interval)
{
try
{
var last = _dbHandler.FindKlineLastUpdate(symbol, interval);
return(last);
}
catch (Exception e)
{
_logger.Info("Failed to load last update date for kline.\n" + e.ToString());
return(-1);
}
}