Backpressure and queue growth controls

[codihuston]

Cause: No explicit backpressure strategy when queues spike.
Analysis: Unbounded queues can grow memory/DB load and cause cascading latency.
Acceptance Criteria:

• Queue depth is bounded or throttled.
• System degrades gracefully under load.
  Solution Approach:
• Implement max queue size, reject/slow intake, or rate limiting.
• Add monitoring around queue depth.