<changelog xmlns="http://www.codesynthesis.com/xmlns/odb/changelog" database="pgsql" version="1"> <changeset version="2"> <alter-table name="object"> <drop-foreign-key name="o1_fk"/> <drop-column name="o1"/> </alter-table> </changeset> <model version="1"> <table name="object" kind="object"> <column name="id" type="INTEGER" null="false"/> <column name="o1" type="INTEGER" null="true"/> <primary-key auto="true"> <column name="id"/> </primary-key> <foreign-key name="o1_fk" deferrable="DEFERRED"> <column name="o1"/> <references table="object1"> <column name="id"/> </references> </foreign-key> </table> <table name="object1" kind="object"> <column name="id" type="INTEGER" null="false"/> <primary-key> <column name="id"/> </primary-key> </table> </model> </changelog>