Github user serg38 commented on the issue:
https://github.com/apache/cloudstack/pull/1593
@rafaelweingartner In usage_evant_details there will be never details with
event_id=0 so there will be no conflict ever if we do it this way. Based on the
code there are some details e.g. CPU speed that might be saved to details table
at some point but they are always tied to respective event_id which is greater
then 0 for normal events. Event id=0 can be considered system and generated by
Sanity job.
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