[jensholdgaard]

GET /api/v2/findings/ ran one dojo_findingvulnerabilityreference query per finding on the page, because vulnerability_ids is serialized on every row and FindingViewSet's queryset doesn't prefetch it.

Adding vulnerability_id_prefetch() to get_queryset() would break a subclass or plugin that adds its own (Django raises "lookup was already seen with a different queryset"), which is why #16512 left it out. Instead, FindingViewSet.paginate_queryset() loads the references for the page with prefetch_related_objects(), skipping findings whose references are already prefetched, so such a queryset keeps working and nothing is loaded twice.

The list scaling tests no longer leave dojo_findingvulnerabilityreference out of the count, give each finding two vulnerability ids, check their order in the response, and cover a queryset that already prefetches them.

Fixes #16652

Claude-Session: https://claude.ai/code/session_0125HXBmURB5ZfBkH3T4LtME

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