# File lib/mini_profiler/storage/file_store.rb, line 107
      def set_viewed(user, id)
        @user_view_lock.synchronize {
          @user_view_cache[user] ||= []
          current = @user_view_cache[user]
          current = [] unless Array === current
          current.delete(id)
          @user_view_cache[user] = current.uniq
        }
      end