Struct DeriveContext 

pub struct DeriveContext {
    pub source_age_days: f64,
    pub atom_derivation: bool,
    pub prior_corroboration_count: i64,
    pub baseline_per_source: f64,
    pub half_life_days: f64,
}

Context the [derive] engine consults at the moment it computes a fresh confidence value.

Pulled out of the Memory payload because three of the five signals require substrate-side queries (prior_corroboration_count is a COUNT(*) over memory_links, baseline_per_source is a lookup in the calibration table, half_life_days honours the per-namespace policy override) and the [derive] surface keeps the caller in charge of those substrate touches so this module stays pure.

Fields

source_age_days: f64

How long ago (in days) the cited source body was first observed. Drives the freshness_factor exponent. The caller computes this from metadata.observed_at (Form 4) or the row’s created_at as a fallback. Negative values are clamped to 0.0.

atom_derivation: bool

Whether the row is an atom of an existing memory (atom_of IS NOT NULL). Atom rows inherit a +0.1 confidence bump because their provenance is anchored to a curator-validated parent.

prior_corroboration_count: i64

Count of memory_links with this row as source_id. More corroboration → higher confidence; the formula uses log10(1 + count) to keep the bump sub-linear.

baseline_per_source: f64

Per-(namespace, source) baseline from the calibration table. Pass 0.5 when no calibrated baseline exists yet.

half_life_days: f64

Half-life (in days) used in the freshness decay computation. Defaults to 30 when the operator hasn’t overridden the value via namespace policy. Capped at f64::EPSILON from below so the divisor in decay::decayed never goes to zero.

Trait Implementations

impl Clone for DeriveContext

fn clone(&self) -> DeriveContext

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for DeriveContext

impl Debug for DeriveContext

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DeriveContext

fn default() -> Self

Returns the “default value” for a type.