The following exception occurred today:

2015-02-05 08:50:03,570 [pool-1-thread-3402] WARN org.hibernate.util.JDBCExceptionReporter - SQL Error: 1452, SQLState: 23000
2015-02-05 08:50:03,572 [pool-1-thread-3402] ERROR org.hibernate.util.JDBCExceptionReporter - Cannot add or update a child row: a foreign key constraint fails (`quickbuild_rx`.`QB_BUILD`, CONSTRAINT `FK_BLD_PROMO_FR` FOREIGN KEY (`QB_PROMOTED_FROM_ID`) REFERENCES `QB_BUILD` (`QB_ID`))
2015-02-05 08:50:03,572 [pool-1-thread-3402] ERROR org.hibernate.event.def.AbstractFlushingEventListener - Could not synchronize database state with session
    org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
        at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:185)
        at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
        at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
        at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
        at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
        at com.pmease.quickbuild.persistence.SessionInterceptor.invoke(SessionInterceptor.java:55)
        at com.google.inject.internal.InterceptorStackCallback$InterceptedMethodInvocation.proceed(InterceptorStackCallback.java:72)
        at com.google.inject.internal.InterceptorStackCallback.intercept(InterceptorStackCallback.java:52)
        at com.pmease.quickbuild.entitymanager.impl.DefaultBuildManager$$EnhancerByGuice$$555cdb38.save(<generated>)
        at com.pmease.quickbuild.entitymanager.impl.DefaultBuildManager.save(DefaultBuildManager.java:51)
        at com.pmease.quickbuild.DefaultBuildEngine.run(DefaultBuildEngine.java:617)
        at com.pmease.quickbuild.DefaultBuildEngine.process(DefaultBuildEngine.java:383)
        at com.pmease.quickbuild.DefaultBuildEngine.access$000(DefaultBuildEngine.java:131)
        at com.pmease.quickbuild.DefaultBuildEngine$2.run(DefaultBuildEngine.java:1076)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
    Caused by: java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key constraint fails (`quickbuild_rx`.`QB_BUILD`, CONSTRAINT `FK_BLD_PROMO_FR` FOREIGN KEY (`QB_PROMOTED_FROM_ID`) REFERENCES `QB_BUILD` (`QB_ID`))
        at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2055)
        at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1467)
        at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeBatch(NewProxyPreparedStatement.java:1723)
        at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
        at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
        ... 21 more
    Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`quickbuild_rx`.`QB_BUILD`, CONSTRAINT `FK_BLD_PROMO_FR` FOREIGN KEY (`QB_PROMOTED_FROM_ID`) REFERENCES `QB_BUILD` (`QB_ID`))
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2834)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2441)
        at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2007)
        ... 25 more
2015-02-05 08:50:03,595 [pool-1-thread-3402] ERROR com.pmease.quickbuild.DefaultBuildEngine - Error processing build request.
    org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
        at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:185)
        at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
        at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
        at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
        at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
        at com.pmease.quickbuild.persistence.SessionInterceptor.invoke(SessionInterceptor.java:55)
        at com.pmease.quickbuild.entitymanager.impl.DefaultBuildManager.save(DefaultBuildManager.java:51)
        at com.pmease.quickbuild.DefaultBuildEngine.run(DefaultBuildEngine.java:617)
        at com.pmease.quickbuild.DefaultBuildEngine.process(DefaultBuildEngine.java:383)
        at com.pmease.quickbuild.DefaultBuildEngine.access$000(DefaultBuildEngine.java:131)
        at com.pmease.quickbuild.DefaultBuildEngine$2.run(DefaultBuildEngine.java:1076)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
    Caused by: java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key constraint fails (`quickbuild_rx`.`QB_BUILD`, CONSTRAINT `FK_BLD_PROMO_FR` FOREIGN KEY (`QB_PROMOTED_FROM_ID`) REFERENCES `QB_BUILD` (`QB_ID`))
        at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2055)
        at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1467)
        at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeBatch(NewProxyPreparedStatement.java:1723)
        at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
        at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
        ... 18 more
    Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`quickbuild_rx`.`QB_BUILD`, CONSTRAINT `FK_BLD_PROMO_FR` FOREIGN KEY (`QB_PROMOTED_FROM_ID`) REFERENCES `QB_BUILD` (`QB_ID`))
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2834)
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156)
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2441)
        at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:2007)
        ... 22 more

Is this something we have to worry about or does it recover itself?