Here is an overview of the DLP Incident Persister service stages.
IDC files (incidents) arrive at Enforce via the Symantec DLP Detection Server Controller service, are written to the C:\ProgramData\Symantec\DataLossPrevention\ServerPlatformCommon\<ver>\incidents directory, get picked up by the Symantec DLP Persister service and go through the following 3 stages while being processed: