@startuml
'https://plantuml.com/class-diagram

class Product {
    int id
    String name
    String category
}

class ProductVariant {
    int id
    int product_id
    String name
    String short_description
    String long_description
    int price
}

class Stock {
    int id
    int product_variant_id
    int quantity
    QuantityUnit quantity_unit
}

class Photo {
    int id
    String local_path
    String file_name
    String unique_name
}

class ProductPhoto {
    int id
    int product_variant_id
    int photo_id
}

Product -- ProductVariant : owns >
ProductVariant -- Stock : owns >
Photo -- ProductPhoto : < owns
ProductVariant -- ProductPhoto : < owns
Stock -- QuantityUnit : contains

enum QuantityUnit {
    g
    dkg
    kg
    piece
}

@enduml