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One of the most important concepts of Delft-FEWS is that always the latest forecast data is available to be used. In a typical operational Delft-FEWS forecasting system, new data is constantly imported, while older data is no longer relevant and can be removed. For a lot of database tables in fews master-controller database, the rows (records) in the database have a expiryTime column specifying when the data can be removed. The removal is done by the so-called RollingBarrel process. It will remove any data for which the expiry time is exceeded.
GlobalProperties DEFAULT_EXPIRY_DAYS
The global property DEFAULT_EXPIRY_DAYS (default 10 days) is a global property that controls the default expiration time for new forecast data that is stored in the Delft-FEWS database.
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