ADVERSARIAL REVIEW: Recent Code Changes

REVIEWER 1: Hostile Performance Critic
  "Your database query in line 23 fetches all user comments before filtering by date. At scale, this is a classic N+1 trap. You're doing 1 query per user per page load. With 100K users, you've built yourself a denial-of-service vulnerability. Add a WHERE clause on the database side, not in JavaScript."
  "Verdict: BLOCKER. Rewrite before merge."

REVIEWER 2: Security Hardliner
  "API endpoint /api/comments/{id} returns entire comment object including user_id without authorization check (line 45). What stops me from incrementing the ID in the URL to read everyone's comments? Even if users are 'anonymous', this leaks correlation data."
  "Also: You're not validating the id parameter is numeric. Regex bypass possible."
  "Verdict: CRITICAL SECURITY ISSUE. Reject this PR."

REVIEWER 3: Test Coverage Examiner
  "You modified authentication logic (auth.ts lines 12-34) but added zero new tests. The existing test file hasn't been touched. How do I know this doesn't break token refresh on mobile? Or handle clock skew?"
  "Coverage dropped from 87% to 79%. This PR removes guardrails without explanation."
  "Verdict: REJECT. Require test coverage above baseline before resubmitting."

REVIEWER 4: API Contract Guardian
  "You changed the response schema for POST /api/comments. Old: {id, text, author}. New: {id, text, author, createdAt, metadata}. This breaks any client expecting the old shape. Where's the migration plan? Will old clients break silently?"
  "No deprecation period, no changelog entry, no backward-compatible flag."
  "Verdict: BLOCKERS. Add version header or dual-response support."

SUMMARY
  4 Blockers: Database query design, unauthorized API access, missing tests, schema breaking change
  3 Nice-to-haves: Logging verbosity, variable naming clarity, comment documentation
  Confidence in your review: Low (self-review likely agrees with everything you wrote)