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>

prisma/migrations/20260225122717_add_performance_indexes/migration.sql

@@ -0,0 +1,11 @@
+-- CreateIndex
+CREATE INDEX "AuditLog_evaluationId_idx" ON "AuditLog"("evaluationId");
+
+-- CreateIndex
+CREATE INDEX "Evaluation_evaluatorId_idx" ON "Evaluation"("evaluatorId");
+
+-- CreateIndex
+CREATE INDEX "Evaluation_templateId_idx" ON "Evaluation"("templateId");
+
+-- CreateIndex
+CREATE INDEX "EvaluationShare_userId_idx" ON "EvaluationShare"("userId");

prisma/schema.prisma

@@ -66,6 +66,9 @@ model Evaluation {
   isPublic        Boolean  @default(false) // visible par tous (ex. démo)
   createdAt       DateTime @default(now())
   updatedAt       DateTime @updatedAt
+
+  @@index([evaluatorId])
+  @@index([templateId])
 }
 
 model EvaluationShare {
@@ -77,6 +80,7 @@ model EvaluationShare {
   createdAt    DateTime   @default(now())
 
   @@unique([evaluationId, userId])
+  @@index([userId])
 }
 
 model DimensionScore {
@@ -106,4 +110,6 @@ model AuditLog {
   newValue     String?
   userId       String?
   createdAt    DateTime @default(now())
+
+  @@index([evaluationId])
 }

src/actions/evaluations.ts

@@ -72,11 +72,12 @@ export async function createEvaluation(data: {
       },
     });
 
-    for (const dim of template.dimensions) {
+    await prisma.dimensionScore.createMany({
-      await prisma.dimensionScore.create({
+      data: template.dimensions.map((dim) => ({
-        data: { evaluationId: evaluation.id, dimensionId: dim.id },
+        evaluationId: evaluation.id,
+        dimensionId: dim.id,
+      })),
     });
-    }
 
     revalidatePath("/dashboard");
     return { success: true, data: { id: evaluation.id } };
@@ -177,9 +178,11 @@ export async function updateEvaluation(id: string, data: UpdateEvaluationInput):
     }
 
     if (dimensionScores && Array.isArray(dimensionScores)) {
-      for (const ds of dimensionScores) {
+      const validScores = dimensionScores.filter((ds) => ds.dimensionId);
-        if (ds.dimensionId) {
+      if (validScores.length > 0) {
-          await prisma.dimensionScore.upsert({
+        await prisma.$transaction(
+          validScores.map((ds) =>
+            prisma.dimensionScore.upsert({
               where: {
                 evaluationId_dimensionId: { evaluationId: id, dimensionId: ds.dimensionId },
               },
@@ -199,8 +202,9 @@ export async function updateEvaluation(id: string, data: UpdateEvaluationInput):
                 confidence: ds.confidence,
                 candidateNotes: ds.candidateNotes,
               },
-          });
+            })
-        }
+          )
+        );
       }
     }