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    Database steps along with commented SQL code used to enable the feature discussed here: Version 9.1 - Scheduled, recurring blackout windows / maintenance windows  This along with some custom PHP code was implemeted on our Orion NPM 9.1 SP1 system to allow us to schedule recurring outages and maintenance windows for monitored nodes.  We are only looking at the nodes table so there is no reason for me to think this wouldn't port quite easily to other versions of NPM.  I'm not including the PHP we used to give us the web ui as I'm guessing everyone will have their own preference on how to implement the front end.  If anyone has specific requirements for the front-end, I can put you in touch with a very talented developer as long as you don't mind using PHP in your environment.