Hi,

I am currently working on fixing bug 
#1456797<https://bugs.launchpad.net/keystone/+bug/1456797>, which is about 
building a mechanism to purge expired token revocation events from keystone 
database. While investigating this bug, I noticed that we actually already 
purge expired revocation events, but we do it from the list-revocation-events 
API. Since the list-revocation-events API is so frequently called, this 
translates to high frequency of delete calls on the keystone database. I was 
wondering if any of you have noticed issues arising due to this load on 
keystone db. If so, I would be interested in hearing about your experience. If 
the current design unduly stresses the db, I can move out the purge feature 
from the list-revocation-events API.

Thanks,
Deepti

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