perf: Fix N+1 query in production line dashboard (27s → <1s)

GetLineDashboard called GetLatestAssessment per hazard (N+1 queries). Replaced with GetLatestAssessmentsByProject — one batch query per station instead of one per hazard. With 50+ hazards across multiple stations, this reduces hundreds of DB queries to ~5. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-05-08 07:03:44 +02:00
parent c6229a2c22
commit 499210eff2
1 changed files with 5 additions and 3 deletions
@@ -256,10 +256,12 @@ func (s *Store) buildStationDashboard(ctx context.Context, st ProductionLineStat
 	mitigations, _ := s.ListMitigationsByProject(ctx, st.ProjectID)
 	sd.MitigationCount = len(mitigations)

-	// Compute risk summary and max SIL/PL from latest assessments
+	// Batch-load all latest assessments in ONE query (not N+1)
+	latestByHazard, _ := s.GetLatestAssessmentsByProject(ctx, st.ProjectID)
+
 	for _, h := range hazards {
-		latest, _ := s.GetLatestAssessment(ctx, h.ID)
-		if latest == nil {
+		latest, ok := latestByHazard[h.ID]
+		if !ok {
 			continue
 		}