Roman Heinrich contributed to both the moonbitlang/core and ArcadeData/arcadedb repositories, focusing on foundational improvements and reliability. In moonbitlang/core, he enhanced maintainability by standardizing code formatting, updating copyright years, and refining comments for clarity, using Java and MoonBit. His work prioritized codebase readability, setting up a cleaner environment for future development. In ArcadeData/arcadedb, Roman addressed a complex bug affecting query accuracy after parameterized multi-field updates involving deleted records. He implemented robust database management and unit testing practices to ensure correct filtering behavior, thereby strengthening data integrity and reducing the risk of regressions in update-heavy workflows.