I also see another problem. Consider the following:

<set name="latestUpdates" table="LATEST_UPDATES" sort="natural" lazy="true" cascade="all">
    <key column="keyColumn"/>
    <element column="updateColumn" type="timestamp" />
</set>

The generated SQL for PostgreSQL is the following:

CREATE TABLE latest_updates
(
  keycolumn bigint NOT NULL,
  updateColumn timestamp without time zone,
  CONSTRAINT fkd3ddc51597a25df5 FOREIGN KEY (keycolumn)
      REFERENCES main_table (id) MATCH SIMPLE
      ON UPDATE NO ACTION ON DELETE NO ACTION
)

As you can see, no primary key and wrong cascade behaviour.

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