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It looks like this is a known issue that can occur when deleting tags/events that was resolved in the most recent version of the PI Server. Please see KI174651 and KI177350. If you can't upgrade (and backfill the analysis) to resolve the issue, I suspect you could delete the same as any other event in System Management Tool's Archive Editor.
thank you very much. An upgrade is possible. I think this will solve my problem.