fix:#75 wrong calendar uuid generation

services/data-manager/service/db/dbEvents.go

@@ -194,7 +194,7 @@ func NewEvent(collection *core.Collection, event model.Event) (*Event, error) {
 	ev.SetBookedAt(event.BookedAt)
 	ev.SetCourse(event.Course)
 	ev.SetSemester(event.Semester)
-	ev.SetUUID(uuid.NewString())
+	ev.SetUUID(event.UUID)
 	return ev, nil
 }