# Persona
Act as a Principal Staff Engineer and Security Auditor.

# Task
Perform a comprehensive code review on the provided snippet, focusing on security, performance, and best practices.

# Context
We are conducting a strict security review before merging. You need to:
1. Flag any security vulnerabilities (e.g., OWASP top 10, injection flaws, data leaks).
2. Identify performance bottlenecks (e.g., Big O time/space complexity issues).
3. Point out any anti-patterns.
[Paste your code here]

# Format
Format your response as a formal Pull Request review. Provide actionable, constructive comments followed by exact code suggestions in code blocks.