fix(academy): mark mixed video-only lessons complete; handle cert insert race

Author: waleedlatif1

apps/sim/app/academy/[courseSlug]/[lessonSlug]/page.tsx

@@ -51,12 +51,15 @@ export default function LessonPage({ params }: LessonPageProps) {
         ? exerciseComplete
         : quizComplete)
 
-  // Video lessons are considered complete once visited — no interactive gate required.
+  const isUngatedLesson =
+    lesson?.lessonType === 'video' ||
+    (lesson?.lessonType === 'mixed' && !lesson.exerciseConfig && !lesson.quizConfig)
+
   useEffect(() => {
-    if (lesson?.lessonType === 'video') {
+    if (isUngatedLesson && lesson) {
       markLessonComplete(lesson.id)
     }
-  }, [lesson?.id, lesson?.lessonType])
+  }, [lesson?.id, isUngatedLesson])
 
   if (!course || !lesson) {
     return (

apps/sim/app/api/academy/certificates/route.ts

@@ -113,9 +113,29 @@ export async function POST(req: NextRequest) {
         certificateNumber,
         metadata,
       })
+      .onConflictDoNothing()
       .returning()
 
     if (!certificate) {
+      const [race] = await db
+        .select()
+        .from(academyCertificate)
+        .where(
+          and(
+            eq(academyCertificate.userId, session.user.id),
+            eq(academyCertificate.courseId, courseId)
+          )
+        )
+        .limit(1)
+      if (race?.status === 'active') {
+        return NextResponse.json({ certificate: race })
+      }
+      if (race) {
+        return NextResponse.json(
+          { error: 'A certificate for this course already exists but is not active.' },
+          { status: 409 }
+        )
+      }
       return NextResponse.json({ error: 'Failed to issue certificate' }, { status: 500 })
     }