You could try get some Mercenaries/Bounty Hunters.
Call help for lawful reinforcement.
Ask your friends in defense of your base, you sakd those keep maintenance and help you time ago? Call them then to help in difficult times.
You can deal with your attackers, Try reach them out and ask if could be a waive or something depending on your RP there could be some chance to stop it ...
Or get a bunch of ships and open all your bays to remove everything on base, leaving it empty... And leave it die, then choose better placement and redo again.
You could move that time to a one more appropiate one...when 5.0/5.1 were done...
But why now when it is a problem?
Maybe you are too lazy or dont wanna spend a pit on any effort in saving it...
I am talking as one suffered same story...
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And so shall they fall, all who bear our mark. No matter who they are, no rank, nor title, nor power shall shield them. When the mark finds them, their time is nigh.