Constant SPAM_LABELS 

pub const SPAM_LABELS: &str = "state/spam/labels/";

The spam filter’s label logs (sioul_core::spam::labels): each device writes its own file, a line per act, never rewritten; every device reads them all, so that a message you said is not spam on one is never flagged again on another, and the training on your computer learns from what you said on your phone. Small, read in every exchange.