feat: Update enrollment last accessed timestamp on course content access and correct k6 test comment typo.

Backend/src/services/CoursesStudent.service.ts

@@ -340,6 +340,17 @@ export class CoursesStudentService {
                 throw new ForbiddenError('You are not enrolled in this course');
             }
 
+            // Update last_accessed_at (fire-and-forget — ไม่ block response)
+            prisma.enrollment.update({
+                where: {
+                    unique_enrollment: {
+                        user_id: decoded.id,
+                        course_id,
+                    },
+                },
+                data: { last_accessed_at: new Date() },
+            }).catch(err => logger.warn(`Failed to update last_accessed_at: ${err}`));
+
             // Get all lesson progress for this user and course
             const lessonIds = course.chapters.flatMap(ch => ch.lessons.map(l => l.id));
             const lessonProgress = await prisma.lessonProgress.findMany({
@@ -1249,17 +1260,17 @@ export class CoursesStudentService {
         } catch (error) {
             logger.error(`Error completing lesson: ${error}`);
             const decoded = jwt.decode(input.token) as { id: number } | null;
-                await auditService.logSync({
-                    userId: decoded?.id || 0,
-                    action: AuditAction.ERROR,
-                    entityType: 'LessonProgress',
-                    entityId: input.lesson_id,
-                    metadata: {
-                        operation: 'complete_lesson',
-                        lesson_id: input.lesson_id,
-                        error: error instanceof Error ? error.message : String(error)
-                    }
-                });
+            await auditService.logSync({
+                userId: decoded?.id || 0,
+                action: AuditAction.ERROR,
+                entityType: 'LessonProgress',
+                entityId: input.lesson_id,
+                metadata: {
+                    operation: 'complete_lesson',
+                    lesson_id: input.lesson_id,
+                    error: error instanceof Error ? error.message : String(error)
+                }
+            });
             throw error;
         }
     }

Backend/tests/k6/login-load-test.js

@@ -31,7 +31,7 @@ export const options = {
     thresholds: {
         http_req_duration: ['p(95)<2000'],  // 95% of requests < 2s
         errors: ['rate<0.1'],               // Error rate < 10%
-        login_duration: ['p(95)<2000'],     // 95% of logins < 2s
+        login_duration: ['p(95)<2000'],     // 95% pof logins < 2s
     },
 };