diff --git a/supabase/migrations/20250917235052_course_analytics.sql b/supabase/migrations/20250917235052_course_analytics.sql
index 00cae1ad..d298f8f9 100644
--- a/supabase/migrations/20250917235052_course_analytics.sql
+++ b/supabase/migrations/20250917235052_course_analytics.sql
@@ -29,3 +29,6 @@ where
 END;
 $function$
 ;
+
+ALTER TABLE public.lesson_completion
+ADD CONSTRAINT unique_lesson_profile UNIQUE (lesson_id, profile_id);