MM-33746 Add TotalMsgCountRoot and MsgCountRoot columns (#17150)

model/team_member.go

@@ -33,6 +33,7 @@ type TeamMember struct {
 type TeamUnread struct {
 	TeamId       string `json:"team_id"`
 	MsgCount     int64  `json:"msg_count"`
+	MsgCountRoot int64  `json:"msg_count_root"`
 	MentionCount int64  `json:"mention_count"`
 }