For what purpose is the 'After Fetch' event used in aggregates?

The 'After Fetch' event in aggregates serves the important role of executing logic that depends on the data that has just been retrieved from the database. This event triggers after the aggregate has completed its data fetching operations, allowing developers to manipulate or utilize the fetched data in various ways.

For example, after retrieving a list of records, you might want to format certain values, perform calculations based on those values, or filter the results further. This provides a flexible layer where you can execute specific logic, ensuring that the post-fetch processing benefits from the actual data that has been retrieved.

The other options, while related to data handling, do not accurately reflect the specific purpose of the 'After Fetch' event. The event is not primarily intended for retrieving data (as this occurs before the event), computing final display values (which can be done in the UI layer), or identifying errors (error handling generally occurs through different mechanisms in the data flow process).