@startuml


top to bottom direction
skinparam linetype ortho

abstract Base {
    id\t\t\t\tInteger\t\t<<Primary>>  {field}
  # __tablename__\tto_snake_case(__name__)    {field}
}
'abstract DeclarativeBase {
'  + registry
'  + metadata
'  # __name__
'  # __mapper__
'  # __table__
'  # __tablename__
'  # __mapper_args__
'  # __table_args__
'  - _sa_registry
'  - _sa_inspect_type()
'  - _sa_inspect_instance()
'}
'
'DeclarativeBase <|-- Base
@enduml