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create table container_registry
(
    container_registry_id   number(38) not null,
    container_id            number(38) not null,
    gadget_id               number(38) not null,
    constraint container_registry_pk
        primary key (container_registry_id),
    constraint cont_gadget_registry_unq
        unique (container_id, gadget_id) 
);

alter table container_registry
add constraint cont_reg_container_id_fk
foreign key (container_id)
references container (container_id);

alter table container_registry
add constraint cont_reg_gadget_id_fk
foreign key (gadget_id)
references gadget (gadget_id);