create table claimant
(
    id                               serial        not null,
    claim_id                         integer       not null,
    person_id                        integer       not null,
    created_at                       timestamp     not null  default now(),
    updated_at                       timestamp,
    constraint primary_key_claimant  primary key (id),
    constraint foreign_key_claimant_claim   
        foreign key (claim_id)  references claim(id),
    constraint foreign_key_claimant_person  
        foreign key (person_id) references person(id),
    constraint unique_claim_person   unique (claim_id, person_id)
);
