fix:#65 updated db model for proxyrecord

services/data-manager/model/seminarGroup.go

@@ -26,3 +26,9 @@ type SeminarGroup struct {
 	Semester      string
 	Events        []Event
 }
+
+type SeminarGroups []SeminarGroup
+
+func (group *SeminarGroup) UniqueKey() string {
+	return group.Course + group.Semester
+}