Ryusuke Kajiyama updated the oracle-japan/ocitutorials repository to align all documentation with the MySQL HeatWave branding, replacing previous references to MySQL Database Service. He focused on content management and technical writing, using Markdown to ensure consistency and clarity across tutorials and top-page content. His work included drafting a comprehensive product description that explains HeatWave’s cluster architecture, in-memory store, columnar data support, and integrated ML/LLM features, as well as its capabilities for OLTP, OLAP, machine learning, and vector search. The updates provided users with clearer, more accurate documentation, though the scope was limited to branding and descriptive enhancements.