Unhappy [Q] boot loop locksettings.db corrupted flash odin to /data/system

Hi all,

Anyone have an idea on how to fix the below?

background info:
- knox 0
- MJ7 stock rom but with MJ1 bootloader
- rooted
- android 4.3

incident:
- restored a bad copy file to /data/system/locksettings.db
- deleted /data/system/locksettings.db-shm
- deleted /data/system/locksettings.db-wal
- now phone boot loops; it loads to the start screen of the touchwiz launcher then immediately reboots
- i can access download mode and stock recovery mode

anyone can point in the right direction how to get this fixed while keeping knox 0 and my data intact? theoretically i would want to push back the correct 3 locksettings files into /data/system