Added additional indexing for the accounting table

database/core.tsql

@@ -251,6 +251,9 @@ CREATE INDEX @PREFIX@accounting_idx2 ON @PREFIX@accounting (PeriodKey);
 CREATE INDEX @PREFIX@accounting_idx4 ON @PREFIX@accounting (Username,AcctSessionID,NASIPAddress,NASPort);
 /* accounting_update_query */
 CREATE INDEX @PREFIX@accounting_idx5 ON @PREFIX@accounting (Username,AcctSessionID,NASIPAddress,NASPort,PeriodKey);
+/* Index for the EventTimestamp */
+CREATE INDEX @PREFIX@accounting_idx7 ON @PREFIX@accounting (EventTimestamp);
+CREATE INDEX @PREFIX@accounting_idx8 ON @PREFIX@accounting (Username,EventTimestamp);