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feat: dream connection eviction uses composite score instead of FIFO

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Matthias Queitsch 2026-04-13 19:15:31 +02:00
parent 1c924bf47c
commit df6d819add
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3 changed files with 58 additions and 10 deletions
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36
crates/vestige-core/src/advanced/dreams.rs
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@ -1076,6 +1076,9 @@ pub struct DiscoveredConnection {
pub connection_type: DiscoveredConnectionType,
/// Reasoning for this connection
pub reasoning: String,
/// When this connection was discovered (used for recency scoring during eviction)
#[serde(default = "Utc::now")]
pub discovered_at: DateTime<Utc>,
}
/// Types of connections discovered during dreaming
@ -1277,6 +1280,7 @@ impl MemoryDreamer {
similarity,
connection_type,
reasoning,
discovered_at: Utc::now(),
});
}
}
@ -1699,10 +1703,38 @@ impl MemoryDreamer {
fn store_connections(&self, connections: &[DiscoveredConnection]) {
if let Ok(mut stored) = self.connections.write() {
stored.extend(connections.iter().cloned());
// Keep last 1000 connections
// Keep the 1000 highest-scoring connections using a composite score
// that balances quality (similarity) and recency (age-based decay).
//
// score = similarity * 0.6 + recency * 0.4
//
// Recency uses exponential decay with a 7-day half-life:
// recency = 0.5 ^ (age_days / 7.0)
//
// This means:
// - A brand-new connection with similarity 0.5 scores 0.70
// - A week-old connection with similarity 0.9 scores 0.74
// - A month-old connection with similarity 0.9 scores 0.58
// Strong old connections are retained longer than weak new ones,
// but eventually yield to fresh high-quality discoveries.
let len = stored.len();
if len > 1000 {
stored.drain(0..(len - 1000));
let now = Utc::now();
stored.sort_unstable_by(|a, b| {
let score = |c: &DiscoveredConnection| -> f64 {
let age_days = now
.signed_duration_since(c.discovered_at)
.num_seconds()
.max(0) as f64
/ 86_400.0;
let recency = (0.5_f64).powf(age_days / 7.0);
c.similarity * 0.6 + recency * 0.4
};
score(b)
.partial_cmp(&score(a))
.unwrap_or(std::cmp::Ordering::Equal)
});
stored.truncate(1000);
}
}
}