FAANG: PromotionService design
Plant UML: @startuml title PromotionService - Class Diagram ' Define external User class from UserService package "UserService" { class User { +id: Long +username: String +email: String +phone: String } } ' Define PromotionService entities package "PromotionService" { class PromotionPlan { +id: UUID +name: String +cost: Decimal +viewCount: Integer +audienceScope: Enum +durationDays: Integer +createdAt: Timestamp +updatedAt: Timestamp } class Promotion { +id: UUID +userId: Long +eventId: UUID ...