Hi,
The "deleted" status is like the trash.
You delete a serial, it is moved to trash ("deleted" status) and if you remove the serial from the trash, it is definitely deleted.
I don't understand what is mean by "complete history", HikaSerial could now store the complete history of serial modifications.
HikaShop with his orders works like that and there is no problem with it.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.