Workflow log that Increase all the time

[Wiz David]

Hi all,
 
I looking for  transaction that delete or decrease the file "WF_LOG_0000000000XX_XXX" from our disk (the disk now (85%).
In the past I deleted the file by transaction in SAP but now I didn't found it.
 
any help?
 
T.I.A
Wiz.
 
 
 
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