mentedb 0.40.0

A purpose-built database engine for AI agent memory
Documentation 
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//! The O(1) dashboard scope counts must mirror the store: correct totals by
//! type, owner, scope, and project; internal (hidden-tagged) working material
//! excluded; decremented on forget; and self-healing when an edit drifts the
//! maintained total away from the real count.

use mentedb::prelude::{AgentId, MemoryNode, MemoryType, UserId};
use mentedb::{CognitiveConfig, MenteDb};

fn config() -> CognitiveConfig {
    CognitiveConfig {
        // The host declares its internal-material spellings.
        hidden_count_tags: vec!["turn".to_string(), "action".to_string()],
        ..Default::default()
    }
}

fn open(dir: &std::path::Path) -> MenteDb {
    MenteDb::open_with_config(dir, config()).expect("open")
}

fn node(user: u128, agent: u128, ty: MemoryType, content: &str, tags: &[&str]) -> MemoryNode {
    let mut n = MemoryNode::new(
        AgentId(uuid::Uuid::from_u128(agent)),
        ty,
        content.to_string(),
        Vec::new(),
    );
    n.user_id = UserId(uuid::Uuid::from_u128(user));
    n.tags = tags.iter().map(|t| t.to_string()).collect();
    n
}

#[test]
fn counts_by_type_owner_scope_excluding_hidden() {
    let dir = tempfile::tempdir().unwrap();
    let db = open(dir.path());

    db.store(node(1, 1, MemoryType::Semantic, "a", &[]))
        .unwrap();
    db.store(node(
        1,
        1,
        MemoryType::Procedural,
        "b",
        &["scope:project:apex"],
    ))
    .unwrap();
    db.store(node(1, 2, MemoryType::Semantic, "c", &[]))
        .unwrap();
    // A shared/global memory (nil owner) and a standing rule.
    db.store(node(0, 0, MemoryType::Semantic, "d", &["scope:always"]))
        .unwrap();
    // Internal working material: excluded from every count.
    db.store(node(1, 1, MemoryType::Episodic, "raw turn", &["turn"]))
        .unwrap();

    let c = db.scope_counts();
    assert_eq!(c.total, 4, "the raw turn is excluded");
    assert_eq!(c.global, 1, "the nil-owner memory");
    assert_eq!(c.always, 1);
    assert_eq!(c.by_type.get("semantic"), Some(&3));
    assert_eq!(c.by_type.get("procedural"), Some(&1));
    assert_eq!(
        c.by_type.get("episodic"),
        None,
        "the only episodic is hidden"
    );
    // User 1 owns a, b, and c (c is user 1 under agent 2), counted by user.
    assert_eq!(
        c.by_user.get(&UserId(uuid::Uuid::from_u128(1)).to_string()),
        Some(&3)
    );
    assert_eq!(
        c.by_agent
            .get(&AgentId(uuid::Uuid::from_u128(1)).to_string()),
        Some(&2)
    );
    assert_eq!(
        c.by_agent
            .get(&AgentId(uuid::Uuid::from_u128(2)).to_string()),
        Some(&1)
    );
    assert_eq!(c.by_project.get("apex"), Some(&1));

    // Growth is keyed by creation month (UTC). All five nodes were created now,
    // but the raw turn is hidden, so the current month counts the four curated
    // ones. Sum across months must equal the (hidden-excluded) total.
    let growth_total: u64 = c.growth.values().sum();
    assert_eq!(growth_total, 4, "growth sums to the non-hidden total");
}

#[test]
fn growth_is_keyed_by_creation_month() {
    let dir = tempfile::tempdir().unwrap();
    let db = open(dir.path());
    // Two fixed creation instants in different months (UTC micros).
    // 2021-01-15T00:00:00Z and 2021-03-20T00:00:00Z.
    let mut jan = node(1, 1, MemoryType::Semantic, "jan", &[]);
    jan.created_at = 1_610_668_800_000_000; // 2021-01-15
    let mut mar = node(1, 1, MemoryType::Semantic, "mar", &[]);
    mar.created_at = 1_616_198_400_000_000; // 2021-03-20
    db.store(jan).unwrap();
    db.store(mar).unwrap();
    let c = db.scope_counts();
    assert_eq!(c.growth.get("2021-01"), Some(&1));
    assert_eq!(c.growth.get("2021-03"), Some(&1));
}

#[test]
fn stats_snapshot_materializes_health_usage_and_persists() {
    let dir = tempfile::tempdir().unwrap();
    {
        let db = open(dir.path());
        // Two curated project memories, one recalled; one hidden turn excluded.
        let mut a = node(1, 1, MemoryType::Semantic, "a", &["scope:project:apex"]);
        a.access_count = 3;
        let b = node(1, 1, MemoryType::Procedural, "b", &["scope:project:apex"]);
        db.store(a).unwrap();
        db.store(b).unwrap();
        db.store(node(1, 1, MemoryType::Episodic, "turn", &["turn"]))
            .unwrap();

        // No snapshot until the sweep materializes one.
        assert!(db.stats_snapshot().is_none());
        let snap = db.refresh_stats_snapshot();
        assert_eq!(snap.count, 2, "hidden turn excluded from health count");
        assert_eq!(snap.project_usage.get("apex"), Some(&3), "recalls summed");
        assert_eq!(snap.health_distribution.iter().sum::<u64>(), 2);
        assert!(snap.avg_health > 0.0 && snap.avg_health <= 1.0);
    }
    // Persisted: a cold reopen serves it from disk with no rescan.
    let db = open(dir.path());
    let snap = db
        .stats_snapshot()
        .expect("snapshot persisted across reopen");
    assert_eq!(snap.count, 2);
    assert_eq!(snap.project_usage.get("apex"), Some(&3));
}

#[test]
fn forget_decrements_the_counts() {
    let dir = tempfile::tempdir().unwrap();
    let db = open(dir.path());
    let a = node(1, 1, MemoryType::Semantic, "keep", &[]);
    let b = node(
        1,
        1,
        MemoryType::Procedural,
        "drop",
        &["scope:project:apex"],
    );
    let b_id = b.id;
    db.store(a).unwrap();
    db.store(b).unwrap();

    // Ground the counts (first read), then forget and confirm the decrement is
    // maintained without a full recount.
    assert_eq!(db.scope_counts().total, 2);
    db.forget(b_id).unwrap();
    let c = db.scope_counts();
    assert_eq!(c.total, 1);
    assert_eq!(c.by_type.get("procedural"), Some(&0));
    assert_eq!(c.by_project.get("apex"), Some(&0));
    assert_eq!(c.by_type.get("semantic"), Some(&1));
}

#[test]
fn first_read_grounds_writes_made_before_it() {
    // Stores happen before the counts are ever read (not yet ready), so they are
    // folded in by the grounding recount rather than lost.
    let dir = tempfile::tempdir().unwrap();
    let db = open(dir.path());
    db.store(node(1, 1, MemoryType::Semantic, "a", &[]))
        .unwrap();
    db.store(node(1, 1, MemoryType::Semantic, "b", &[]))
        .unwrap();
    db.store(node(1, 1, MemoryType::Episodic, "turn", &["action"]))
        .unwrap();
    assert_eq!(
        db.scope_counts().total,
        2,
        "grounded from the store, hidden excluded"
    );
}

#[test]
fn counts_and_blobs_persist_across_reopen() {
    let dir = tempfile::tempdir().unwrap();
    {
        let db = MenteDb::open_with_config(dir.path(), config()).expect("open");
        db.store(node(1, 1, MemoryType::Semantic, "a", &[]))
            .unwrap();
        db.store(node(
            1,
            1,
            MemoryType::Procedural,
            "b",
            &["scope:project:apex"],
        ))
        .unwrap();
        db.store(node(1, 1, MemoryType::Episodic, "raw turn", &["turn"]))
            .unwrap();
        assert_eq!(db.scope_counts().total, 2, "grounds, hidden excluded");
        db.write_blob("stats", b"cached-stats-payload");
        db.flush_full().expect("flush");
    }
    // Reopen: counts come from the persisted snapshot (no recount), blob reads.
    let db = MenteDb::open_with_config(dir.path(), config()).expect("reopen");
    let c = db.scope_counts();
    assert_eq!(c.total, 2, "persisted counts survive a cold reopen");
    assert_eq!(c.by_type.get("procedural"), Some(&1));
    assert_eq!(c.by_project.get("apex"), Some(&1));
    assert_eq!(
        db.read_blob("stats").as_deref(),
        Some(&b"cached-stats-payload"[..])
    );
    assert_eq!(db.read_blob("never-written"), None);
}

/// A reopen after writes landed past the last snapshot used to discard the
/// persisted counts, so the first dashboard read walked every memory on the
/// request path. The approximate read now returns the persisted value at once
/// (flagged ungrounded), and grounding brings it exact.
#[test]
fn reopen_serves_persisted_counts_without_a_recount() {
    let dir = tempfile::tempdir().unwrap();
    {
        let db = open(dir.path());
        for i in 0..3 {
            db.store(node(1, 1, MemoryType::Semantic, &format!("fact {i}"), &[]))
                .unwrap();
        }
        assert_eq!(db.scope_counts().total, 3);
        db.flush_full().unwrap();
        // Lands after the snapshot, so the stamped count no longer matches.
        db.store(node(1, 1, MemoryType::Semantic, "a later fact", &[]))
            .unwrap();
        db.flush().unwrap();
    }

    let db = open(dir.path());
    let (approx, grounded) = db.scope_counts_approx();
    assert!(!grounded, "writes after the snapshot leave it ungrounded");
    assert_eq!(approx.total, 3, "the persisted value is served, not zero");

    assert_eq!(db.scope_counts().total, 4);
    let (exact, grounded) = db.scope_counts_approx();
    assert!(grounded);
    assert_eq!(exact.total, 4);
}

/// Concurrent first readers share one grounding recount and all see the same
/// exact counts.
#[test]
fn concurrent_first_reads_agree() {
    let dir = tempfile::tempdir().unwrap();
    {
        let db = open(dir.path());
        for i in 0..50 {
            db.store(node(1, 1, MemoryType::Semantic, &format!("fact {i}"), &[]))
                .unwrap();
        }
        db.flush().unwrap();
    }
    let db = std::sync::Arc::new(open(dir.path()));
    let totals: Vec<u64> = (0..8)
        .map(|_| {
            let db = db.clone();
            std::thread::spawn(move || db.scope_counts().total)
        })
        .collect::<Vec<_>>()
        .into_iter()
        .map(|h| h.join().unwrap())
        .collect();
    assert!(totals.iter().all(|t| *t == 50), "{totals:?}");
}