Automatic nonvisted structure wipe details
The vanilla game has a mechanism to wipe structures if they are not “visited”. What does visited mean? Visiting the structure, at the very least, requires you to walk on the structure. Moving stuff around in cargo and turning it on/off are not valid to reset the visited time stamp.
I don’t really care for this mechanic the way it is but it is what it is and at least now you know what you have to do.