- Add proper cache expiration with 5-minute TTL
- Optimize git log file reading to avoid loading entire file
- Read only last chunk (1024 bytes) instead of all lines
- Add shorter TTL (30s) for error cases to allow retry
- Improve error handling with UnicodeDecodeError support
- Maintain backward compatibility and security (no subprocess calls)
This fixes the 30-second response time issue by implementing efficient
caching and optimized file I/O operations.