Contributed to the JetBrains/phpstorm-stubs repository by expanding PDO driver support, focusing on backend development and database management using PHP. Developed new stub classes for Firebird, Dblib, and Odbc, each with dedicated constants and methods such as getApiVersion, while introducing deprecation annotations to guide users toward updated APIs. Registered these classes in PhpStormStubsMap to enhance IDE indexing and code completion, aligning with upcoming deprecation timelines for improved API clarity. The work improved cross-database support and static analysis accuracy for PHP projects, laying a foundation for future enhancements without introducing regressions, and demonstrated careful attention to migration and developer guidance.