Here's an idea to improve defense measures / tactics for planets: The flux detector
It would work like a trap, you set it on a planet for 7 days for instance like regular traps, if another ship scans the planet when the flux detector is active, then you receive a warning log:
"Warning, planet XXXX has been scanned by another ship"
the rarity of the device would probably be quite high of course.
This way you can prepare some counter ... Cause currently the only way to know is to keep a list of your planets in a doc and flux probe then from time to time. I don't come by 12 flux probes/week

for xx planets ...