Found an odd bug.
In attempting to make a save of a specific scenario to revisit, I found that hostile ground forces would cease to oppose mine if I copied the DB, renamed it, and then copied it back to the Aurora folder and renamed it back to AuroraDB.db.
I have reproduced this bug three times in a row. Each time, I confirmed the opposing NPR was indeed hostile and fired on them using STOs, at which point they retaliated with ship-based weapons, but never with ground forces. Eventually, the population surrenders (or in the case of insufficient occupation forces, shows the relevant message), even though I confirmed in the database that enemy ground forces were present. To clarify - upon creation of the NPR, hostile ground forces oppose mine as normal - however upon saving, moving the file and reloading, they do not.
I have attached the database after the moving, renaming, and re-renaming, if that would be of any help, but the bug is easily and consistently reproducible, so one could test it on their own if they'd like. (The scenario I'm working on is pretty cool though, and has a lot of work put into it, so you could check that out if you're inclined - it's mostly why I felt the need to post this bug - because I want to eventually want to share it without incident, while being able to name the file something other than AuroraDB).
v2.1.1, unmodded.