clientSellCoveredRange method
Implementation
num clientSellCoveredRange(int herderId, DateTime start, DateTime end) =>
where((t) => t.status)
.where((t) => t.contactId == herderId)
.where((t) => t.date.isAfter(start))
.where((t) => t.date.isBefore(end))
.where((t) => t.ticketType == TicketType.sellCovered)
.fold(0.0, (prev, e) => prev + e.received);