@startuml API 收藏应用
actor User
participant "AppCenter Router" as Router
participant "AppCenter Manager" as Manager
database MongoDB

User -> Router: PUT /api/app/{appId}
Router -> Manager: modify_favorite_app()
Manager -> MongoDB: find app
MongoDB --> Manager: return app data
Manager -> Manager: verify favorite status
Manager -> MongoDB: update favorites array
Manager --> Router: return ModFavAppFlag
Router --> User: return response
@enduml