fix: add fix for negative token values in metrics and add logs to tro…

[johnnyeric]

Summary

• Adding logs to help troubleshoot session-ingest workers bottleneck
• Fixed zed errors with negative token values in metrics

Verification

• pnpm --filter cloudflare-session-ingest exec vitest run src/dos/session-metrics.test.ts src/queue-consumer.test.ts
• pnpm --filter cloudflare-session-ingest typecheck
  scripts/lint-all.sh

Visual Changes

N/A

Reviewer Notes

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Clean, targeted PR: the negative-token clamping fix is well-tested and correct, and the timing log additions follow existing codebase patterns without introducing any security, performance, or correctness issues.

Files Reviewed (4 files)

• services/session-ingest/src/dos/session-metrics.ts — nonNegative() helper + clamping at output, correct
• services/session-ingest/src/dos/session-metrics.test.ts — test for negative-value clamping
• services/session-ingest/src/queue-consumer.ts — timing logs in processItem and applyMetadataChanges
• services/session-ingest/src/session-events.ts — timing log in notifyUserSessionEvent

Fix these issues in Kilo Cloud

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_{Reviewed by claude-4.6-sonnet-20260217 · 570,738 tokens}

_{Review guidance: REVIEW.md from base branch main}