During May 2025, work on the Stefan2114/UBB-SE-2025-927-2 repository focused on enhancing data integrity within the database layer. The developer introduced a cascade deletion mechanism that automatically removes related posts, reactions, comments, and group memberships when a group is deleted, effectively preventing orphaned records and reducing the need for manual cleanup. Additionally, a new meal_types table was added to standardize meal-type data across groups and posts, supporting schema normalization. These improvements were implemented using SQL and database management skills, with careful schema design and migration strategies to enforce referential integrity and streamline data maintenance processes throughout the application.