What maintains the bn qos data tables in the database?

Document ID : KB000109662
Last Modified Date : 03/08/2018
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Could you tell me what maintains the bn_qos_data tables in the UIM database?
The data_engine is responsible for the maintenance of the BN_* tables 

The stored proc spn_de_DataMaint_DeleteOldData is the one that carries out the maintenance on the RN,HN,BN tables.
For the BN tables the retention is based on the Delete historic data older than value in the Data Engine GUI.