Monthly work summary for 2025-09 (pingcap/tidb). Focused on delivering audit-log configurability and system variables to improve observability, configurability, and compliance. Delivered a configurable audit log buffer (size and flush interval), added configuration constants, validation rules, and system variables to govern audit log behavior, and updated dependencies to support enhanced logging.

March 2025: Delivered a high-impact BR bug fix for pingcap/tidb to prevent data corruption during backup/restore by ignoring WORKLOAD_SCHEMA and handling it as a system schema. Implemented a constant-based approach to workload schema naming and refactored related code for consistency and maintainability, strengthening data integrity and reliability of backup/restore workflows across environments.

November 2024: Delivered a critical bug fix in TiDB's query planner for CTE usage in UPDATE statements. The change enforces correct privilege evaluation, prevents CTE table names from being added to the SELECT privilege list, and tightens CTE name uniqueness checks. Result: reduced authorization errors and improved stability and security for UPDATE workflows in multi-tenant deployments.

Month: 2024-10. Key outcomes include removal of Telemetry from the product docs and stabilization of CDC expectations through expanded test coverage. In pingcap/docs, the Telemetry feature was deprecated and removed, including related documentation, configuration options, and SQL statements, with complete removal scheduled from version 8.1.0. In Shopify/tidb, we added test coverage for CDC integration to verify handling of duplicate keys under a unique index, addressing potential test regressions. Business impact includes reduced maintenance burden, clearer product behavior, and improved reliability of data workflows. Technologies demonstrated include documentation cleanup, deprecation strategy, integration test design, and Go-based testing.