Worked on the prisma/prisma-engines repository to enhance stability and correctness in the createManyAndReturn operation, focusing on the proper handling of fields marked with @ignore. Addressed a crash by ensuring that both scalar and composite @ignore fields are excluded from query results and mutations, aligning this behavior with other field types across create and mutation paths. Introduced a regression test to maintain coverage for field ignoring rules and prevent future issues. Utilized Rust for backend and API development, with an emphasis on database management and testing. These changes improved engine reliability and reduced runtime errors during bulk create operations.