Developed immutable dictionary utilities for the keephq/keep repository, introducing the dict_set and dict_merge functions to enhance safe manipulation of dictionaries and JSON strings. Focused on reducing mutation-related risks, the work emphasized maintainability and reliability in data handling. Comprehensive unit tests were written and integrated to ensure robust coverage and to increase confidence in the new utilities’ correctness. The implementation leveraged Python and JSON processing, with a strong emphasis on unit testing practices. No critical bugs were reported during this period, reflecting careful engineering and thorough validation. The contribution strengthened the repository’s approach to immutable data operations and testing.