storing last run in database

lib/types/job.js

@@ -18,6 +18,7 @@
  * @property {SpatialFilter | null} [spatialFilter] Optional spatial filter configuration as GeoJSON FeatureCollection.
  * @property {SpecFilter | null} [specFilter] Optional listing specifications.
  * @property {number} [numberOfFoundListings] Count of active listings for this job.
+ * @property {number | null} [lastRunAt] Epoch ms at which the job was last triggered, or null if never triggered.
  */
 
 export {};