Tracks authenticated UI user requests to understand usage patterns:
- New ClickHouse usage_events table with 90-day TTL
- UsageTrackingInterceptor captures method, path, duration, user
- Path normalization groups dynamic segments ({id}, {hash})
- Buffered writes via WriteBuffer + periodic flush
- Admin endpoint GET /api/v1/admin/usage with groupBy=endpoint|user|hour
- Skips agent requests, health checks, and data ingestion
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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