public async Task <ICollection <HistoryData> > GetStoreHistory(string username, Guid storeId)
{
ICollection <IHistory> history = await marketStores.GetStoreHistory(username, storeId);
ICollection <HistoryData> ret = new HashSet <HistoryData>();
foreach (var h in history)
{
ret.Add(new HistoryData(h));
}
return(ret);
}