What is the approach of managing their own data?

      const { data } = await supabase
        .from("course_progress")
        .select("id")
        .eq("course_id", courseId)
        .eq("user_id", userId)
        .maybeSingle();

      const {error} = await supabase.from("course_progress").upsert({
        id: data?.id,
        user_id: userId,
        course_id: courseId,
        progress: progress,
      });

      const { data } = await supabase
        .from("course_progress")
        .select("id")
        .eq("course_id", courseId)
        .eq("user_id", userId)
        .maybeSingle();

      const {error} = await supabase.from("course_progress").upsert({
        id: data?.id,
        user_id: userId,
        course_id: courseId,
        progress: progress,
      });