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CAIQUM-9078: Database backups failing with "The request could not be processed. Try later." after upgrading to AIQUM 9.18P2

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Issue

After upgrading to AIQUM 9.18P1 or P2, AIQUM database backups fail with the error "The request could not be processed. Try later."
The server.log shows a message like:
2026-07-01 17:00:11,034 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (task-scheduler-2) Cannot add or update a child row: a foreign key constraint fails (`ocum`.`event`, CONSTRAINT `Event_obsoleteCauseEvent_id_FK` FOREIGN KEY (`obsoleteCauseEvent_id`) REFERENCES `event` (`id`) ON DELETE SET NULL)
The ocumserver.log shows a message like:
2026-07-01 17:00:11,069 ERROR [oncommand] [task-scheduler-12] [Backup|ScheduleBackup] [c.n.d.impl.backup.BackupScheduleJob] Error occurred in Regular Backup Job:
org.springframework.dao.DataIntegrityViolationException: could not execute batch [Cannot add or update a child row: a foreign key constraint fails (`ocum`.`event`, CONSTRAINT `Event_obsoleteCauseEvent_id_FK` FOREIGN KEY (`obsoleteCauseEvent_id`) REFERENCES `event` (`id`) ON DELETE SET NULL)] [update Event set acknowledgedBy=?,acknowledgedTimestamp=?,assignedTimestamp=?,assignedTo=?,cluster_id=?,clusterNode_id=?,encodedArguments=?,impactArea=?,isChecked=?,isContinuous=?,lastObservedTime=?,maintenance=?,notesCount=?,objVersion=?,obsoleteCause=?,obsoleteCauseEncodedArguments=?,obsoleteCauseEvent_id=?,obsoleteCauseValue_id=?,obsoleteTimestamp=?,resolvedBy=?,resolvedTimestamp=?,source_id=?,source_type=?,source_fullName=?,source_resourceKey=?,source_resourceType=?,state=?,subType=?,targetId=?,targetType=?,thresholdPolicyId=?,eventTimestamp=?,uuid=?,value_id=?,vserver_id=? where id=? and objVersion=?]; SQL [update Event set acknowledgedBy=?,acknowledgedTimestamp=?,assignedTimestamp=?,assignedTo=?,cluster_id=?,clusterNode_id=?,encodedArguments=?,impactArea=?,isChecked=?,isContinuous=?,lastObservedTime=?,maintenance=?,notesCount=?,objVersion=?,obsoleteCause=?,obsoleteCauseEncodedArguments=?,obsoleteCauseEvent_id=?,obsoleteCauseValue_id=?,obsoleteTimestamp=?,resolvedBy=?,resolvedTimestamp=?,source_id=?,source_type=?,source_fullName=?,source_resourceKey=?,source_resourceType=?,state=?,subType=?,targetId=?,targetType=?,thresholdPolicyId=?,eventTimestamp=?,uuid=?,value_id=?,vserver_id=? where id=? and objVersion=?]; constraint [null]

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