API Keys Usage

Activity across every API key — last-used timestamp, lifetime request count, rate-limit hits, and a derived activity status. Dormant or never-used keys are candidates for retirement.

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Lifetime counters: use_count bumped in the same UPDATE that stamps last_used_at; rate_limit_hit_countbumped in the rate limiter's OnRejected callback. See migration 035. 30-day trend backed by pay.api_key_usage_daily, snapshotted nightly at 01:00 UTC (migration 038).