No you can’t unless you have access to the phone itself. It’s impossible. You clearly have no idea what you’re talking about.
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how often do you check encryption keys in chats? How does WebRTC relay work need to be explained?
I used lvm with SSD cache few years, but time to time I have problems with loads after reboot. If forgot about reboots all work great with LVM raid + LVM cache. Cache can be configured without raid. And you can add or remove cache in any time. Docs: https://man.archlinux.org/man/lvmcache.7