Add leaderboard for all tracks and track calendar

server/internal/catalog/catalog.go

@@ -606,4 +606,45 @@ func (s *Service) ListCarsByOwner(ownerID string) []CarMeta {
 		}
 	}
 	return out
+}
+
+// GetTrackCalendar returns all track calendar entries from the store.
+func (s *Service) GetTrackCalendar(ctx context.Context) ([]TrackCalendarEntry, error) {
+	if s.store == nil {
+		return nil, ErrStoreMissing
+	}
+	return s.store.GetTrackCalendar(ctx)
+}
+
+// CreateTrackCalendar creates a new calendar entry.
+func (s *Service) CreateTrackCalendar(ctx context.Context, trackID string, startAt, endAt time.Time) (TrackCalendarEntry, error) {
+	if s.store == nil {
+		return TrackCalendarEntry{}, ErrStoreMissing
+	}
+	
+	s.mu.RLock()
+	_, trackExists := s.tracks[TrackID(trackID)]
+	s.mu.RUnlock()
+	if !trackExists {
+		return TrackCalendarEntry{}, fmt.Errorf("%w: track %s does not exist", ErrNotFound, trackID)
+	}
+
+	if startAt.After(endAt) || startAt.Equal(endAt) {
+		return TrackCalendarEntry{}, fmt.Errorf("%w: start time must be before end time", ErrInvalidInput)
+	}
+
+	entry := TrackCalendarEntry{
+		TrackID: trackID,
+		StartAt: startAt,
+		EndAt:   endAt,
+	}
+	return s.store.CreateTrackCalendar(ctx, entry)
+}
+
+// DeleteTrackCalendar deletes a calendar entry.
+func (s *Service) DeleteTrackCalendar(ctx context.Context, id int) error {
+	if s.store == nil {
+		return ErrStoreMissing
+	}
+	return s.store.DeleteTrackCalendar(ctx, id)
 }