Gas Optimization Security Review

Review this smart contract for gas optimization opportunities while maintaining security:

```
${{CONTRACT_CODE}}
```

Primary Functions to Optimize: ${{PRIORITY_FUNCTIONS}}

Analyze and provide:
1. Current gas consumption analysis per function
2. Optimization opportunities:
   - Storage vs memory usage
   - Loop optimizations
   - Packed structs
   - Short-circuiting
   - Caching state variables
3. Security trade-offs for each optimization
4. Unsafe optimizations to avoid
5. Recommended changes with:
   - Before/after gas estimates
   - Security impact assessment
   - Code examples
6. Testing recommendations post-optimization

Prioritize optimizations by gas savings vs security risk ratio.