Worked on stabilizing macro identifier handling in the TobikoData/sqlmesh repository by addressing a normalization bug affecting star macro expansion. Applied Python and SQL skills to implement a fix that ensures consistent treatment of table aliases and relation names, using the normalize_identifiers function to improve SQL generation reliability across different environments. Expanded test coverage with targeted, Snowflake-specific scenarios in the test_macros.py suite, focusing on regression and edge-case validation. Emphasized test-driven development and code quality by delivering clear commit messages and robust testing practices, ultimately reducing alias-related failures and streamlining model generation pipelines for downstream users and maintainers.