Sergey Nikitin refactored the indexing statistics management within the Near-One/mpc repository by moving IndexerStats into the IndexerState struct, integrating its initialization and usage directly into the core indexing workflow. This approach centralized metric tracking, reducing fragmentation and the risk of data drift while improving maintainability and encapsulation. Working exclusively in Rust, Sergey focused on system design and refactoring to deliver a cleaner, safer indexing module with minimal impact on the external API. The changes established a more organized foundation for future metric enhancements, demonstrating thoughtful engineering depth in restructuring internal data flows for long-term scalability and code clarity.