Because we’ll be grouping jobs under their parent contact lists it will
be useful to have a way of showing how many times a contact list has
been used. This will give the right information scent to indicate that
clicking into a contact list is where you go to see its jobs. This means
that the API needs to return a count of jobs for each contact list.
Putting this code feels very non-idiomatic for our API. So suggestions
about how to better architect it welcome…
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