Backend

A record of tracing why JWT authentication filter errors in GRIT were returned as Tomcat 500 errors instead of the common API error response, and how I handled exceptions based on where they occurred.

A record of cleaning up repeated validation and assignment logic inside GRIT's user profile initialization and update flow by moving the rules into the entity.

A record of using GPT Vision and structured output in UniSchedule to convert timetable images into schedule data, and improving the prompt along the way.

A note from integrating an external API in UniSchedule, where I chose between RestTemplate and WebClient based on Spring's direction, configuration flexibility, and the current MVC structure.

How I compared Hibernate @OnDelete and JPA Cascade for deleting product options while keeping persistence context consistency in mind.

A record of looking again at a circular reference between ProductService and OptionService while implementing a gift API, instead of hiding it with @Lazy.