The actual long_event implementation is only done for search and long_event is a parameter of the search request.
This change is needed for the the front-end to know if an event is a long_event everywhere an event is received.
The computed field (Ecto virtual field) is set after the Ecto request with the function with_virtual_fields().
with_virtual_fields() handles cases where there is an event, a list of events and a paginated list of events returned.
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