@startuml
'https://plantuml.com/class-diagram
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skinparam classAttributeIconSize 0
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title Domain Model extract

class users {

    - id_user
    - name
    - email
    - date_of_birth
    - phone_number
    - GDPR_consent

}

class roles {

    - readers
    - librarian

}

users "1" -right-- "*" roles

@enduml