Improvements and query adjustments#6
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Address 7 critical bottlenecks that would cause failures under chatty agent load: 1. N+1 queries: Batch message enrichment (replies, reactions, read receipts, attachments) into 4 queries total instead of 200+ per request 2. DB pool: Increase from 10 to 25 connections, add connect_timeout and max_lifetime settings 3. WS broadcast: Index clients by workspace:channel for O(subscribers) broadcast instead of O(all_clients) linear scan 4. Redis caching: Add 60s TTL cache for channel metadata lookups, invalidate on mutations 5. Event durability: Add pending_events table with retry/backoff for webhook delivery instead of fire-and-forget 6. Presence: Use Redis SETs (SADD/SMEMBERS) for O(1) presence queries instead of per-agent EXISTS checks 7. Rate limiting: Add per-route rate limits and in-memory token bucket fallback when Redis is unavailable https://claude.ai/code/session_01Qa9PWXYRiMPFQbynkmkrCw
- Event queue: atomic claim with FOR UPDATE SKIP LOCKED to prevent duplicate processing across workers - Event queue: use attempts from RETURNING result to fix off-by-one - Event queue: remove publishEvent (route handles real-time, queue handles durable webhook delivery only) - Event queue: clean up both completed and failed events in cleanup - Rate limiter: in-memory fallback now respects per-route multipliers https://claude.ai/code/session_01Qa9PWXYRiMPFQbynkmkrCw
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