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The purge action is run with the opevents-cli.exe command line utility. When using this utility the retention period is relative to the current time and is referred to as 'purge_older_than'. The value passed with the command my may be expressed in minutes, hours, or days (combinations are also possible). Using days as an example, if the retention period were 1 year the command line option for the retention period would like like this:
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