SchemaTool - ignores the attribute uniq in relations

<entity name="Default_Model_Test" table="test">
  <id name="id" type="integer" column="id">
    <generator strategy="AUTO"/>
  </id>
  <field name="blabla" column="blabla" type="boolean"/>
  <one-to-one field="user" target-entity="Users_Model_User">
    <join-column name="users_id" referenced-column-name="id" on-delete="CASCADE" on-update="CASCADE" unique="false" />
  </one-to-one>
</entity>

CREATE TABLE test (id INT AUTO_INCREMENT NOT NULL, users_id INT DEFAULT NULL, blabla TINYINT(1) NOT NULL, UNIQUE INDEX test_users_id_uniq (users_id), PRIMARY KEY(id)) ENGINE = InnoDB;
ALTER TABLE test ADD FOREIGN KEY (users_id) REFERENCES users(id) ON UPDATE CASCADE ON DELETE CASCADE;