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Workflows that import or process external historical data may produce small time series objects (stored as binary objects,blobs, in the time series database table). These small blobs may only cover a few time steps. If the time series table contains many small blobs, the number of records in the database can become very large (>1 mln records). In those cases it is advised to run a database maintenance workflow that amalgamates the small blobs in the time series table into larger blobs that cover larger time periods. In Delft-FEWS this can be don done with the ImportAmalgamate module; this module amalgamates all time series records that are created in specific workflows. After the amalgamate module is finished, the original amalgamated workflows with all its imported external data is scheduled for deletion. The amalgamated time series will be stored in the database as time series that are created by the database maintenance workflow.
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