Aurélien Merel focused on stabilizing and governing database schema changes for the etalab/admin_api_entreprise repository, emphasizing operational reliability over new feature delivery. Over two months, he addressed critical issues in the access_logs table by implementing idempotent migration patterns in Ruby, using conditional table creation and disabling the default id column to prevent unintended schema changes. His work in database schema management reduced deployment risk and improved data integrity, ensuring analytics and auditing processes remained reliable. By aligning schema definitions and correcting migration logic, Aurélien delivered depth in backend engineering, prioritizing safe, repeatable deployments and minimizing operational downtime across environments.