perf: optimisations DB — batch queries et index

- createEvaluation: remplace N create() par un createMany() (N→1 requête)
- updateEvaluation: regroupe les upserts en $transaction() parallèle
- Ajout d'index sur Evaluation.evaluatorId, Evaluation.templateId,
  EvaluationShare.userId et AuditLog.evaluationId

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/actions/evaluations.ts

@@ -72,11 +72,12 @@ export async function createEvaluation(data: {
       },
     });
 
-    for (const dim of template.dimensions) {
-      await prisma.dimensionScore.create({
-        data: { evaluationId: evaluation.id, dimensionId: dim.id },
-      });
-    }
+    await prisma.dimensionScore.createMany({
+      data: template.dimensions.map((dim) => ({
+        evaluationId: evaluation.id,
+        dimensionId: dim.id,
+      })),
+    });
 
     revalidatePath("/dashboard");
     return { success: true, data: { id: evaluation.id } };
@@ -177,30 +178,33 @@ export async function updateEvaluation(id: string, data: UpdateEvaluationInput):
     }
 
     if (dimensionScores && Array.isArray(dimensionScores)) {
-      for (const ds of dimensionScores) {
-        if (ds.dimensionId) {
-          await prisma.dimensionScore.upsert({
-            where: {
-              evaluationId_dimensionId: { evaluationId: id, dimensionId: ds.dimensionId },
-            },
-            update: {
-              score: ds.score,
-              justification: ds.justification,
-              examplesObserved: ds.examplesObserved,
-              confidence: ds.confidence,
-              candidateNotes: ds.candidateNotes,
-            },
-            create: {
-              evaluationId: id,
-              dimensionId: ds.dimensionId,
-              score: ds.score,
-              justification: ds.justification,
-              examplesObserved: ds.examplesObserved,
-              confidence: ds.confidence,
-              candidateNotes: ds.candidateNotes,
-            },
-          });
-        }
+      const validScores = dimensionScores.filter((ds) => ds.dimensionId);
+      if (validScores.length > 0) {
+        await prisma.$transaction(
+          validScores.map((ds) =>
+            prisma.dimensionScore.upsert({
+              where: {
+                evaluationId_dimensionId: { evaluationId: id, dimensionId: ds.dimensionId },
+              },
+              update: {
+                score: ds.score,
+                justification: ds.justification,
+                examplesObserved: ds.examplesObserved,
+                confidence: ds.confidence,
+                candidateNotes: ds.candidateNotes,
+              },
+              create: {
+                evaluationId: id,
+                dimensionId: ds.dimensionId,
+                score: ds.score,
+                justification: ds.justification,
+                examplesObserved: ds.examplesObserved,
+                confidence: ds.confidence,
+                candidateNotes: ds.candidateNotes,
+              },
+            })
+          )
+        );
       }
     }