generate excel worksheets when data is available instead of on-demand

server/handler/snapshots.go

@@ -111,7 +111,7 @@ func (h *Handler) renderSnapshotList(w http.ResponseWriter, r *http.Request, sna
 		label := report.FormatSnapshotLabel(snapshotType, record.SnapshotTime, record.TableName)
 		entries = append(entries, views.SnapshotEntry{
 			Label: label,
-			Link:  "/api/report/snapshot?table=" + url.QueryEscape(record.TableName),
+			Link:  "/reports/" + url.PathEscape(record.TableName) + ".xlsx",
 			Count: record.SnapshotCount,
 		})
 	}