In the next update they will be implementing something for the purge like you are suggesting!
The treasure coffer.
Where ever your treasure coffer is placed they will come to attack the coffer. You can choose to not have a coffer in your base as far as I understand now.
I highly suggest just not playing during purge time for now. Or placing all your valuables in a vault until it is updated. Search up the new treasure coffer system!
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