Sorry to hear about your troubles. Through JIRA the only way to restore a custom field with the same ID would be to perform a full system restore to some point prior to the field being deleted. This would overwrite your entire instance with the data contained in the backup file.
You can create a new field for story points. It is just a " numeric" field type within the system. Just calling it "Story Points" won't make all of your historical reports work again. It sounds like you knew that already though.
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