Add call to startListeningForUpdates()

src/entities/InterchangeSystem.ts

@@ -111,6 +111,7 @@ export class InterchangeSystem {
     let etaRepository: BaseRedisETARepository;
     if (args.useSelfUpdatingEtas) {
       etaRepository = new RedisSelfUpdatingETARepository(shuttleRepository);
+      (etaRepository as RedisSelfUpdatingETARepository).startListeningForUpdates();
     } else {
       etaRepository = new RedisExternalSourceETARepository();
     }