perf(emergency): optimise EXISTS subqueries and prefetch related data - #2768
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…ld reports and ops updates - Split ordered querysets (used in Subquery) from unordered ones (used in Exists) — removes redundant ORDER BY from EXISTS() SQL, cutting EA stage response time ~25% - Add prefetch_related for field_reports and drefoperationalupdate_set in viewset and serializers — reduces list endpoint queries ~15% (N+1 -> batch)
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June 25, 2026 09:34
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response time ~25%
viewset and serializers
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