chore: snapshot before performance optimization

keep-notes/lib/ai/services/auto-label-creation.service.ts

@@ -454,7 +454,7 @@ Deine Antwort (nur JSON):
         let names: string[] = []
         if (note.labels) {
           try {
-            const parsed = JSON.parse(note.labels) as unknown
+            const parsed = note.labels as unknown
             names = Array.isArray(parsed)
               ? parsed.filter((n): n is string => typeof n === 'string' && n.trim().length > 0)
               : []
@@ -471,7 +471,7 @@ Deine Antwort (nur JSON):
         await prisma.note.update({
           where: { id: noteId },
           data: {
-            labels: JSON.stringify(names),
+            labels: names as any,
             labelRelations: {
               connect: { id: label.id },
             },