update the time of the data update

src/loaders/shuttle/ApiBasedShuttleRepositoryLoader.ts

@@ -221,7 +221,7 @@ export class ApiBasedShuttleRepositoryLoader implements ShuttleRepositoryLoader
             secondsRemaining: jsonEta.secondsSpent,
             shuttleId: `${shuttleId}`,
             stopId: stopId,
-            millisecondsSinceEpoch: Date.now(),
+            updateTimeMs: Date.now(),
             systemId: this.systemIdForConstructedData,
           };