16 UMLUseCase 3056 768 192 96 lt=. Collaboration fg=red bg=yellow UMLClass 256 208 464 192 User -- telegram_id: integer (PK) username: varchar(20) (Unique) admin: tinyint(1) UMLClass 928 576 464 176 Score -- telegram_id: integer (PK/FK) date: Date (PK) product_id: varchar(20) (FK) guess: float score: integer UMLClass 1568 192 464 208 Product -- product_id: varchar(20) (PK) price: float image_link: Text title: Text description: Text date: Date Relation 1376 224 224 496 lt=- 120.0;10.0;10.0;290.0 Relation 704 240 256 416 lt=- 140.0;240.0;10.0;10.0