You can modify the interval in which expired subscriptions set to receive reauthorization requests are purged from the database. This property only applies to Ro online charging Web service.
If the subscriptionPurgingInterval property is missing or commented out (default), purging will not occur. The default value is Purging is suspended. The minimum value is 30 seconds, and the maximum value is 32,000,000 seconds. If you are designing a system that requires a large number of subscription requests, you may want to adjust the purging interval to prevent large numbers of records from being purged at one time. If a large number of records require purging when the end of interval is reached, the performance of the overall system may be affected.
subscriptionPurgingInterval = 30