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Details of the most recent executions of transformations can be recorded, identifying when they ran and whether they completed
successfully. This can be used to determine how complete and up-to-date specific information in the data warehouse is.
An ActivityExecution represents an execution of a whole TransformationActivity, and a StepExecution object represents an execution
of an individual TransformationStep. If a TransformationStep involves the use of an Operation, an associated StepExecution
may reference a CallAction that records the actual arguments passed to the Operation.
These classes allow the lineage of data in a data warehouse to be preserved, by recording when and how it was derived, and
where it came from.