Over a two-month period, this developer contributed to both the moonbitlang/core and ArcadeData/arcadedb repositories, focusing on foundational improvements and reliability. In moonbitlang/core, they enhanced maintainability by standardizing code formatting, updating copyright information, and correcting documentation typos, all aimed at improving code readability and setting the stage for safer future refactoring. For ArcadeData/arcadedb, they addressed a critical bug in the Java-based filtering logic, ensuring accurate query results after parameterized multi-field updates involving deleted records. Their work included strengthening unit testing and database management practices, resulting in more robust update workflows and increased confidence in data integrity.