The check-then-act pattern in `register_activity_spike` has been
replaced with `find_or_create_by!` to eliminate the race condition
that could lead to creating multiple activity spikes for a card. To
support this change, the `card_id` index on `cards_activity_spikes`
has been made unique.
ref: https://app.fizzy.do/5986089/cards/3063
These are mainly because the fixture's UUIDs are deterministic rather
than time-sortable, and more places where we need to correct the fixture
IDs as well.
We do this from jobs, so there is no request id to discard the page refresh in the client. We
don't want page refreshes in these cases, as those are normally handled via the change that
originated this detection, in any case.
Mike Dalessio