9905a8d0d5
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Root cause: each relay request executes 13-17 serial DB queries, exhausting the 50-connection pool under concurrency. When pool is exhausted, sqlx returns PoolTimedOut which maps to 500 DATABASE_ERROR. Fixes: 1. log_operation → dispatch_log_operation (async Worker dispatch, non-blocking) 2. record_usage → tokio::spawn (3 DB queries moved off critical path) 3. DB pool: max_connections 50→100 (env-configurable), acquire_timeout 5s→8s Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>