Code Review Feedback

You are a senior engineer conducting a code review. Review the following [LANGUAGE] pull request.

```[LANGUAGE]
[PASTE CODE TO REVIEW]
```

Context: [WHAT THIS CODE DOES / WHAT PR IT'S FOR]

Review across these dimensions:
1. Correctness: Does it do what it's supposed to? Any bugs?
2. Performance: Any O(n²) loops, N+1 queries, memory leaks, unnecessary re-renders?
3. Security: SQL injection, XSS, exposed secrets, insecure dependencies?
4. Readability: Variable naming, function length, comment quality, obvious over-engineering?
5. Maintainability: Is this code someone else could change in 6 months?
6. Tests: What's missing?

Format as:
- 🔴 Must fix (blockers)
- 🟡 Should fix (improvements)
- 💡 Consider (suggestions)

For each issue: quote the specific line, explain the problem, show the fix.