public int GetSubtasksForCard(BoardCard card)
 {
     return card.Checklists.Sum(checklist => checklist.ChecklistItems.Count());
 }
 public int GetCompletedSubtasksForCard(BoardCard card)
 {
     return card.Checklists.Sum(checklist => checklist.ChecklistItems.Count(i => i.Checked));
 }