AuditService.logAfterCommit() called writeLog() inline inside the afterCommit()
callback. At that point Spring's transaction synchronizations are still active on
the thread, so SimpleJpaRepository.save() throws IllegalStateException which the
catch block silently swallowed — leaving audit_log permanently empty.
Fix: submit writeLog() to auditExecutor so it runs on a fresh thread with no active
synchronization context. Also switch auditExecutor from CallerRunsPolicy to AbortPolicy
to prevent the bug from silently recurring when the queue fills under load.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>