Weekly score board

System design round. Ten people record one score per model run and look at a weekly board. Clarify that a week is Monday through Sunday in one timezone, and that a missing score is not zero. Draw the write path and the read path. Then a score arrives twice for the same run: keep the first and reject the second. Then the board is read while a write is in flight: the reader sees the previous week plus a mark that this week is incomplete. Say what you store, what you show, and what you would drop if only ten people use it.