public IObservable <ITimeEntriesTotals> GetTotals(
     long workspaceId, DateTimeOffset startDate, DateTimeOffset endDate)
 => timeEntriesReportsApi.GetTotals(workspaceId, startDate, endDate);
 public IObservable <ITimeEntriesTotals> Execute()
 => api.GetTotals(userId, workspaceId, startDate, endDate);