toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() => 'DeliveryRow[attempt=$attempt, created=$created, delivery=$delivery, durationMs=$durationMs, endpoint=$endpoint, error=$error, httpStatus=$httpStatus, status=$status, subject=$subject]';