Worked on the tensorzero/tensorzero repository to address reliability issues in asynchronous test workflows for ClickHouse operations. Focused on backend development and testing using Rust, the developer implemented a targeted fix for flaky tests by introducing sleep statements within mocked batch test functions. This approach ensured that asynchronous processing completed before assertions were made, reducing test flakiness and improving determinism in continuous integration environments. The changes were isolated to testing utilities, aligning with repository hygiene standards and CI stability goals. By enhancing confidence in data visibility and shortening feedback loops, the work enabled more efficient and reliable development cycles for the team.