Add properties to determine when the parking repository should log data

src/repositories/InMemoryParkingRepository.ts

@@ -7,7 +7,11 @@ import { HistoricalParkingAverageQueryResult } from "./ParkingGetterRepository";
 
 type ParkingStructureID = string;
 
+export const PARKING_LOGGING_INTERVAL_MS = 60000;
+
 export class InMemoryParkingRepository implements ParkingGetterSetterRepository {
+  private dataLastAdded: Map<ParkingStructureID, Date> = new Map();
+
   constructor(
     private structures: Map<ParkingStructureID, IParkingStructure> = new Map(),
     private historicalData: Map<ParkingStructureID, IParkingStructureTimestampRecord[]> = new Map(),