add delta sync before each reconcile, have it not repeat if it's been done in the last minute

reconcile.go

@@ -6,6 +6,9 @@ import (
 )
 
 func (s *Server) reconcile(ctx context.Context, runID int64, rep *User, dept string) error {
+	if err := s.syncIfStale(ctx, time.Minute); err != nil {
+		log.Printf("run %d: pre-run sync failed, using cached roster: %v", runID, err)
+	}
 	reps, err := s.store.RepsFor(rep.ChapterID, dept)
 	if err != nil {
 		return err