Follow-up from "AI Impact: Add GraphQL API for AI Acceptance Rate"

The following discussion from !157035 (merged) should be addressed:

• @pshutsin started a discussion: (+3 comments)

  @ahegyi I wonder if we can remove daily usages and reuse this MV? By expanding this MV for all events we can then do SELECT max(date), user_id AS last_used_at FROM code_suggestion_daily_events WHERE event = 1 GROUP BY user_id to get last usage for event 1.

  I assume that the query will not scan entire table because we have all fields in ORDER BY key. Is it correct?