Use worker pool extensively

internal/dav/delete.go

@@ -83,7 +83,7 @@ func handleDeleteFile(w http.ResponseWriter, segments []string, t *torrent.Torre
 	}
 
 	file.Link = "unselect"
-	t.SetChecksum("")
+	t.SetNewLatestState(torrent.EmptyState())
 	w.WriteHeader(http.StatusNoContent)
 	return nil
 }