it couldn't save the database because "read only filesystem", which would be scary as fuck if it was true, but the fs looks perfectly fine 
had to sigkill it 3 minutes after a sigterm, so that could be associated to a fs issue but sill weird, and there's nothing related in dmesg
@CobaltVelvet Looks like everything over 48 minutes old in my "Home" column is missing.
@CobaltVelvet if redis has memory pressure it dumps keys so that seems likely
and now it's saving just fine.
wait did the redis data get wiped