I have one master table and twelve partition tables for each month. I have twelve rules that insert rows into correct partition table (after column "timpul" - timestamp). What is wrong? I real need partition tables...:(.

Hibernate version:8.1.3

Mapping documents:
Master.hbm.xml
<class name="unu.model.Master" table="master" schema="public" dynamic-insert="true" dynamic-update="true" lazy="true">
<id name="masterid" type="int">
<column name="masterid" />
<generator class="sequence">
<param name="sequence">seq_master</param>
</generator>
</id>
<property name="nume" type="string">
<column name="nume" length="25" not-null="true" unique="true" />
</property>
<property name="timpul" type="timestamp">
<column name="timpul" length="8" not-null="true" />
</property>
</class>


Code between sessionFactory.openSession() and session.close():
tx = session.beginTransaction();
Master master = new Master();
master.setNume("Master11");
master.setTimpul(new Date());
session.save(master);
tx.commit();


Full stack trace of any exception that occurs:
org.hibernate.StaleStateException: Batch update returned unexpected row count from update: 0 actual row count: 0 expected: 1
at org.hibernate.jdbc.BatchingBatcher.checkRowCount(BatchingBatcher.java:93)
at org.hibernate.jdbc.BatchingBatcher.checkRowCounts(BatchingBatcher.java:79)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:58)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:195)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:235)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:139)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at unu.Hibernate.main(Hibernate.java:85)


Name and version of the database you are using:PostgreSQL-8.1

The generated SQL (show_sql=true):

Debug level Hibernate log excerpt: