Worked on the shopsys/shopsys repository to enhance Doctrine entity management by introducing a RemoveColumn attribute, enabling declarative exclusion of specific parent-entity columns. This feature was implemented in PHP and leveraged advanced attribute usage, supported by a custom Doctrine event subscriber to ensure runtime consistency. The approach focused on improving maintainability and migration safety, allowing teams to evolve data models more transparently. Documentation was updated to guide users on the new attribute and its integration into existing workflows. No major bugs were addressed during this period, with efforts concentrated on feature delivery and clear communication of usage patterns for future development.