This has been a pet project of mine for a arma 3 unit I am in.
"PIMS" is a attempt to enable us to have inventories persist over multiple operations by storing the items in a database. A User would simple go to their box, retrieve the items they want and then at the end they can store their items again. the system tracks everything, every item and every bullet.
in-between operations, we (the arma unit i am in) also have a website where players can then buy and trade their items and restock.
https://steamcommunity.com/sharedfiles/filedetails/?id=3486560417
https://github.com/Adisuchti/C9PIMS