directlx-claude-config/plans/polymorphic-fluttering-neumann.md

Plan: Document Favorites Feature Session

Context

This session added the Favorites data-access and service layer to the Spring Boot app. The goal is to capture everything done — files created, design decisions, and API surface — in a new docs/favorites-feature.md, consistent with the style of existing docs files (docs/setup-summary.md, docs/integration-testing.md).

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File to Create

docs/favorites-feature.md

Content to include:

1. What was built — one-sentence summary
2. Files created — table of the two new files with their package paths
3. FavoriteRepository — method table (name, return type, reason)
   • Note on @Transactional on deleteByUserIdAndItemId
4. FavoriteService — method table (name, behaviour / error thrown)
   • Note on class-level @Transactional + readOnly = true overrides on reads
5. Design decisions — duplicate guard in addFavorite, existence check in removeFavorite
6. Verification — mvn clean compile

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Critical files (read-only reference)

File	Role
src/main/java/com/example/app/repository/FavoriteRepository.java	Created this session
src/main/java/com/example/app/service/FavoriteService.java	Created this session
docs/setup-summary.md	Style reference

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Verification

After creation:

# No compilation impact, but confirm the project still compiles clean
mvn clean compile