To have all important information, a Catalog needs to include the information about the timeperiod for which it contains the events.
A ForecastCatalog contains n realizations of a Catalog, identified by the catalog_id column. However we also need the information how many catalogs (n) in total there are, since it is possible that only m<n catalogs contain events and are represented in the ForecastCatalog.
Catalogneeds to include the information about the timeperiod for which it contains the events.ForecastCatalogcontains n realizations of aCatalog, identified by thecatalog_idcolumn. However we also need the information how many catalogs (n) in total there are, since it is possible that only m<n catalogs contain events and are represented in theForecastCatalog.