sqlite_graphrag/storage/

memories.rs

//! Persistence layer for the `memories` table and its vector companion.
//!
//! Functions here encapsulate every SQL statement touching `memories`,
//! `memory_embeddings` and the FTS5 `fts_memories` shadow table. Callers receive
//! typed [`MemoryRow`] or [`NewMemory`] values and never build SQL strings.

use crate::embedder::f32_to_bytes;
use crate::errors::AppError;
use crate::storage::utils::with_busy_retry;
use rusqlite::{params, Connection};
use serde::{Deserialize, Serialize};

/// Input payload for inserting or updating a memory.
///
/// `body_hash` must be the BLAKE3 digest of `body`. The `metadata` field is
/// stored as a TEXT column containing JSON.
#[derive(Debug, Serialize, Deserialize)]
pub struct NewMemory {
    pub namespace: String,
    pub name: String,
    pub memory_type: String,
    pub description: String,
    pub body: String,
    pub body_hash: String,
    pub session_id: Option<String>,
    pub source: String,
    pub metadata: serde_json::Value,
}

/// Fully materialized row from the `memories` table.
///
/// Returned by [`read_by_name`], [`read_full`], [`list`] and [`fts_search`].
/// The `metadata` field is kept as a JSON string to avoid double parsing.
#[derive(Debug, Serialize)]
pub struct MemoryRow {
    pub id: i64,
    pub namespace: String,
    pub name: String,
    pub memory_type: String,
    pub description: String,
    pub body: String,
    pub body_hash: String,
    pub session_id: Option<String>,
    pub source: String,
    pub metadata: String,
    pub created_at: i64,
    pub updated_at: i64,
    /// Unix epoch when the memory was soft-deleted, or `None` for active memories.
    /// Surfaced in `list --include-deleted --json` so LLM consumers can distinguish
    /// active from soft-deleted rows without a second SQL query (v1.0.37 H7+M9 fix).
    #[serde(skip_serializing_if = "Option::is_none")]
    pub deleted_at: Option<i64>,
}

/// Finds a live memory by `(namespace, name)` and returns key metadata.
///
/// # Arguments
///
/// - `conn` — open SQLite connection configured with the project pragmas.
/// - `namespace` — resolved namespace for the lookup.
/// - `name` — kebab-case memory name.
///
/// # Returns
///
/// `Ok(Some((id, updated_at, max_version)))` when the memory exists and is
/// not soft-deleted, `Ok(None)` otherwise.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn find_by_name(
    conn: &Connection,
    namespace: &str,
    name: &str,
) -> Result<Option<(i64, i64, i64)>, AppError> {
    let mut stmt = conn.prepare_cached(
        "SELECT m.id, m.updated_at, COALESCE(MAX(v.version), 0)
         FROM memories m
         LEFT JOIN memory_versions v ON v.memory_id = m.id
         WHERE m.namespace = ?1 AND m.name = ?2 AND m.deleted_at IS NULL
         GROUP BY m.id",
    )?;
    let result = stmt.query_row(params![namespace, name], |r| {
        Ok((
            r.get::<_, i64>(0)?,
            r.get::<_, i64>(1)?,
            r.get::<_, i64>(2)?,
        ))
    });
    match result {
        Ok(row) => Ok(Some(row)),
        Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
        Err(e) => Err(AppError::Database(e)),
    }
}

/// Looks up a memory by `(namespace, name)` regardless of deletion state.
///
/// Returns `Some((id, is_deleted))` when the row exists.
/// `is_deleted` is `true` when `deleted_at IS NOT NULL`.
///
/// # Errors
///
/// Propagates [`AppError::Database`] on SQLite failures.
pub fn find_by_name_any_state(
    conn: &Connection,
    namespace: &str,
    name: &str,
) -> Result<Option<(i64, bool)>, AppError> {
    let mut stmt = conn.prepare_cached(
        "SELECT id, (deleted_at IS NOT NULL) AS is_deleted
         FROM memories WHERE namespace = ?1 AND name = ?2",
    )?;
    let result = stmt.query_row(params![namespace, name], |r| {
        Ok((r.get::<_, i64>(0)?, r.get::<_, bool>(1)?))
    });
    match result {
        Ok(row) => Ok(Some(row)),
        Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
        Err(e) => Err(AppError::Database(e)),
    }
}

/// Clears `deleted_at` to restore a soft-deleted memory.
///
/// # Errors
///
/// Propagates [`AppError::Database`] on SQLite failures.
pub fn clear_deleted_at(conn: &Connection, memory_id: i64) -> Result<(), AppError> {
    conn.execute(
        "UPDATE memories SET deleted_at = NULL WHERE id = ?1",
        params![memory_id],
    )?;
    Ok(())
}

/// Looks up a live memory by exact `body_hash` within a namespace.
///
/// Used during `remember` to short-circuit semantic duplicates before
/// spending an embedding call.
///
/// # Returns
///
/// `Ok(Some(id))` when a live memory with the same hash exists,
/// `Ok(None)` otherwise.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn find_by_hash(
    conn: &Connection,
    namespace: &str,
    body_hash: &str,
) -> Result<Option<i64>, AppError> {
    let mut stmt = conn.prepare_cached(
        "SELECT id FROM memories WHERE namespace = ?1 AND body_hash = ?2 AND deleted_at IS NULL",
    )?;
    match stmt.query_row(params![namespace, body_hash], |r| r.get(0)) {
        Ok(id) => Ok(Some(id)),
        Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
        Err(e) => Err(AppError::Database(e)),
    }
}

/// Inserts a new row into the `memories` table.
///
/// # Arguments
///
/// - `conn` — active SQLite connection, typically inside a transaction.
/// - `m` — validated payload including `body_hash` and serialized metadata.
///
/// # Returns
///
/// The `rowid` assigned to the newly inserted memory.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on insertion failure and
/// `Err(AppError::Json)` if metadata serialization fails.
pub fn insert(conn: &Connection, m: &NewMemory) -> Result<i64, AppError> {
    // G29 Passo 2 (v1.0.69): runtime guard for the CHECK constraint on
    // `source`. Even though `MemorySource` is the typed future, every
    // legacy `NewMemory { source: "..." }` literal still flows through
    // this function; validating here keeps the footgun from regressing
    // for callers that have not yet migrated to the enum.
    let validated_source = crate::memory_source::validate_source(&m.source)?;
    conn.execute(
        "INSERT INTO memories (namespace, name, type, description, body, body_hash, session_id, source, metadata)
         VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)",
        params![
            m.namespace, m.name, m.memory_type, m.description, m.body,
            m.body_hash, m.session_id, validated_source,
            serde_json::to_string(&m.metadata)?
        ],
    )?;
    Ok(conn.last_insert_rowid())
}

/// Updates an existing memory optionally guarded by optimistic concurrency.
///
/// When `expected_updated_at` is `Some(ts)` the row is only updated if its
/// current `updated_at` equals `ts`. This protects concurrent `edit` calls
/// from silently clobbering each other.
///
/// # Returns
///
/// `Ok(true)` when exactly one row was updated, `Ok(false)` when the
/// optimistic check failed or the memory does not exist.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn update(
    conn: &Connection,
    id: i64,
    m: &NewMemory,
    expected_updated_at: Option<i64>,
) -> Result<bool, AppError> {
    // G29 Passo 2 (v1.0.69): runtime guard for the CHECK constraint on
    // `source`. Mirrors `insert` so `body-enrich` and other mutations
    // cannot reintroduce the historical "enrich" literal that broke
    // `body-enrich` in v1.0.55 - v1.0.68.
    let validated_source = crate::memory_source::validate_source(&m.source)?;
    let affected = if let Some(ts) = expected_updated_at {
        conn.execute(
            "UPDATE memories SET type=?2, description=?3, body=?4, body_hash=?5,
             session_id=?6, source=?7, metadata=?8
             WHERE id=?1 AND updated_at=?9 AND deleted_at IS NULL",
            params![
                id,
                m.memory_type,
                m.description,
                m.body,
                m.body_hash,
                m.session_id,
                validated_source,
                serde_json::to_string(&m.metadata)?,
                ts
            ],
        )?
    } else {
        conn.execute(
            "UPDATE memories SET type=?2, description=?3, body=?4, body_hash=?5,
             session_id=?6, source=?7, metadata=?8
             WHERE id=?1 AND deleted_at IS NULL",
            params![
                id,
                m.memory_type,
                m.description,
                m.body,
                m.body_hash,
                m.session_id,
                validated_source,
                serde_json::to_string(&m.metadata)?
            ],
        )?
    };
    Ok(affected == 1)
}

/// Replaces the vector row for a memory in `memory_embeddings`.
///
/// v1.0.76: sqlite-vec was removed. Embeddings live in a regular BLOB-backed
/// table; cosine similarity is computed in pure Rust on demand. The
/// `memory_type`, `name`, and `snippet` arguments are accepted for API
/// compatibility but are not stored — the FTS5 shadow table is the
/// source of truth for textual metadata.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn upsert_vec(
    conn: &Connection,
    memory_id: i64,
    namespace: &str,
    _memory_type: &str,
    embedding: &[f32],
    _name: &str,
    _snippet: &str,
) -> Result<(), AppError> {
    let embedding_bytes = f32_to_bytes(embedding);
    with_busy_retry(|| {
        conn.execute(
            "DELETE FROM memory_embeddings WHERE memory_id = ?1",
            params![memory_id],
        )?;
        conn.execute(
            "INSERT INTO memory_embeddings(memory_id, namespace, embedding, source, model, dim)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6)",
            params![
                memory_id,
                namespace,
                &embedding_bytes,
                "llm-headless",
                crate::constants::SQLITE_GRAPHRAG_VERSION,
                crate::constants::embedding_dim() as i64,
            ],
        )?;
        Ok(())
    })
}

/// Deletes the vector row for `memory_id` from `memory_embeddings`.
///
/// Called during `forget` and `purge` to keep the embeddings table
/// consistent with the logical state of `memories`. FK CASCADE on
/// `memory_embeddings.memory_id` handles the common case, but this
/// function exists so callers can delete the embedding first
/// (preserving the row in `memories` for audit).
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn delete_vec(conn: &Connection, memory_id: i64) -> Result<(), AppError> {
    conn.execute(
        "DELETE FROM memory_embeddings WHERE memory_id = ?1",
        params![memory_id],
    )?;
    Ok(())
}

/// Fetches a live memory by `(namespace, name)` and returns all columns.
///
/// # Returns
///
/// `Ok(Some(row))` when found, `Ok(None)` when missing or soft-deleted.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn read_by_name(
    conn: &Connection,
    namespace: &str,
    name: &str,
) -> Result<Option<MemoryRow>, AppError> {
    let mut stmt = conn.prepare_cached(
        "SELECT id, namespace, name, type, description, body, body_hash,
                session_id, source, metadata, created_at, updated_at, deleted_at
         FROM memories WHERE namespace=?1 AND name=?2 AND deleted_at IS NULL",
    )?;
    match stmt.query_row(params![namespace, name], |r| {
        Ok(MemoryRow {
            id: r.get(0)?,
            namespace: r.get(1)?,
            name: r.get(2)?,
            memory_type: r.get(3)?,
            description: r.get(4)?,
            body: r.get(5)?,
            body_hash: r.get(6)?,
            session_id: r.get(7)?,
            source: r.get(8)?,
            metadata: r.get(9)?,
            created_at: r.get(10)?,
            updated_at: r.get(11)?,
            deleted_at: r.get(12)?,
        })
    }) {
        Ok(m) => Ok(Some(m)),
        Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
        Err(e) => Err(AppError::Database(e)),
    }
}

/// Soft-deletes a memory by setting `deleted_at = unixepoch()`.
///
/// Versions and chunks are preserved so `restore` can undo the operation
/// until a subsequent `purge` reclaims the storage permanently.
///
/// # Returns
///
/// `Ok(true)` when a live memory was soft-deleted, `Ok(false)` when no
/// matching live row existed.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn soft_delete(conn: &Connection, namespace: &str, name: &str) -> Result<bool, AppError> {
    let affected = conn.execute(
        "UPDATE memories SET deleted_at = unixepoch() WHERE namespace=?1 AND name=?2 AND deleted_at IS NULL",
        params![namespace, name],
    )?;
    Ok(affected == 1)
}

/// Lists live memories in a namespace ordered by `updated_at` descending.
///
/// # Arguments
///
/// - `memory_type` — optional filter on the `type` column.
/// - `limit` / `offset` — standard pagination controls in rows.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn list(
    conn: &Connection,
    namespace: &str,
    memory_type: Option<&str>,
    limit: usize,
    offset: usize,
    include_deleted: bool,
) -> Result<Vec<MemoryRow>, AppError> {
    if let Some(mt) = memory_type {
        let sql = if include_deleted {
            "SELECT id, namespace, name, type, description, body, body_hash,
                    session_id, source, metadata, created_at, updated_at, deleted_at
             FROM memories WHERE namespace=?1 AND type=?2
             ORDER BY updated_at DESC LIMIT ?3 OFFSET ?4"
        } else {
            "SELECT id, namespace, name, type, description, body, body_hash,
                    session_id, source, metadata, created_at, updated_at, deleted_at
             FROM memories WHERE namespace=?1 AND type=?2 AND deleted_at IS NULL
             ORDER BY updated_at DESC LIMIT ?3 OFFSET ?4"
        };
        let mut stmt = conn.prepare_cached(sql)?;
        let rows = stmt
            .query_map(params![namespace, mt, limit as i64, offset as i64], |r| {
                Ok(MemoryRow {
                    id: r.get(0)?,
                    namespace: r.get(1)?,
                    name: r.get(2)?,
                    memory_type: r.get(3)?,
                    description: r.get(4)?,
                    body: r.get(5)?,
                    body_hash: r.get(6)?,
                    session_id: r.get(7)?,
                    source: r.get(8)?,
                    metadata: r.get(9)?,
                    created_at: r.get(10)?,
                    updated_at: r.get(11)?,
                    deleted_at: r.get(12)?,
                })
            })?
            .collect::<Result<Vec<_>, _>>()?;
        Ok(rows)
    } else {
        let sql = if include_deleted {
            "SELECT id, namespace, name, type, description, body, body_hash,
                    session_id, source, metadata, created_at, updated_at, deleted_at
             FROM memories WHERE namespace=?1
             ORDER BY updated_at DESC LIMIT ?2 OFFSET ?3"
        } else {
            "SELECT id, namespace, name, type, description, body, body_hash,
                    session_id, source, metadata, created_at, updated_at, deleted_at
             FROM memories WHERE namespace=?1 AND deleted_at IS NULL
             ORDER BY updated_at DESC LIMIT ?2 OFFSET ?3"
        };
        let mut stmt = conn.prepare_cached(sql)?;
        let rows = stmt
            .query_map(params![namespace, limit as i64, offset as i64], |r| {
                Ok(MemoryRow {
                    id: r.get(0)?,
                    namespace: r.get(1)?,
                    name: r.get(2)?,
                    memory_type: r.get(3)?,
                    description: r.get(4)?,
                    body: r.get(5)?,
                    body_hash: r.get(6)?,
                    session_id: r.get(7)?,
                    source: r.get(8)?,
                    metadata: r.get(9)?,
                    created_at: r.get(10)?,
                    updated_at: r.get(11)?,
                    deleted_at: r.get(12)?,
                })
            })?
            .collect::<Result<Vec<_>, _>>()?;
        Ok(rows)
    }
}

pub fn count(
    conn: &Connection,
    namespace: &str,
    memory_type: Option<&str>,
    include_deleted: bool,
) -> Result<usize, AppError> {
    let (sql, params_vec): (&str, Vec<Box<dyn rusqlite::types::ToSql>>) = match (
        memory_type,
        include_deleted,
    ) {
        (Some(mt), true) => (
            "SELECT COUNT(*) FROM memories WHERE namespace=?1 AND type=?2",
            vec![
                Box::new(namespace.to_string()) as Box<dyn rusqlite::types::ToSql>,
                Box::new(mt.to_string()),
            ],
        ),
        (Some(mt), false) => (
            "SELECT COUNT(*) FROM memories WHERE namespace=?1 AND type=?2 AND deleted_at IS NULL",
            vec![
                Box::new(namespace.to_string()) as Box<dyn rusqlite::types::ToSql>,
                Box::new(mt.to_string()),
            ],
        ),
        (None, true) => (
            "SELECT COUNT(*) FROM memories WHERE namespace=?1",
            vec![Box::new(namespace.to_string()) as Box<dyn rusqlite::types::ToSql>],
        ),
        (None, false) => (
            "SELECT COUNT(*) FROM memories WHERE namespace=?1 AND deleted_at IS NULL",
            vec![Box::new(namespace.to_string()) as Box<dyn rusqlite::types::ToSql>],
        ),
    };
    let params_refs: Vec<&dyn rusqlite::types::ToSql> =
        params_vec.iter().map(|b| b.as_ref()).collect();
    let n: i64 = conn.query_row(sql, params_refs.as_slice(), |r| r.get(0))?;
    Ok(n as usize)
}

/// Runs a KNN search over `memory_embeddings`, optionally restricted to namespaces.
///
/// # Arguments
///
/// - `embedding` — query vector of length [`crate::constants::embedding_dim()`].
/// - `namespaces` — namespaces to search. Empty slice means "all namespaces".
/// - `memory_type` — optional filter on the `type` column.
/// - `k` — maximum number of hits to return.
///
/// # Returns
///
/// A vector of `(memory_id, distance)` pairs sorted by ascending distance.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn knn_search(
    conn: &Connection,
    embedding: &[f32],
    namespaces: &[String],
    memory_type: Option<&str>,
    k: usize,
) -> Result<Vec<(i64, f32)>, AppError> {
    if embedding.len() != crate::constants::embedding_dim() {
        return Err(AppError::Embedding(format!(
            "knn_search embedding has {} dims, expected {}",
            embedding.len(),
            crate::constants::embedding_dim()
        )));
    }
    // v1.0.76: full table scan + in-process cosine similarity. The
    // `memory_embeddings` table no longer has a `distance` column or a
    // `type` column (the namespace/type filters were dropped for the
    // BLOB-backed table — they live on the `memories` table). The
    // cosine result is converted to a "distance" so callers that read
    // `distance` keep working unchanged.

    // Build the SQL once with the namespace IN clause shape.
    let placeholders = (0..namespaces.len())
        .map(|_| "?")
        .collect::<Vec<_>>()
        .join(",");
    let sql = if namespaces.is_empty() {
        "SELECT memory_id, embedding, namespace FROM memory_embeddings".to_string()
    } else {
        format!(
            "SELECT memory_id, embedding, namespace FROM memory_embeddings \
             WHERE namespace IN ({placeholders})"
        )
    };
    let mut stmt = conn.prepare(&sql)?;
    let mut raw_params: Vec<Box<dyn rusqlite::ToSql>> = Vec::new();
    for ns in namespaces {
        raw_params.push(Box::new(ns.clone()));
    }
    let param_refs: Vec<&dyn rusqlite::ToSql> = raw_params.iter().map(|b| b.as_ref()).collect();
    let rows = stmt.query_map(param_refs.as_slice(), |r| {
        let id: i64 = r.get(0)?;
        let bytes: Vec<u8> = r.get(1)?;
        let ns: String = r.get(2)?;
        Ok((id, bytes, ns))
    })?;

    // Optionally restrict to a memory type by joining against the
    // `memories` table on the fly.
    let type_filter = memory_type.map(|t| t.to_string());
    let mut candidates: Vec<(i64, f32)> = Vec::new();
    for row in rows {
        let (id, bytes, ns) = row?;
        let stored = crate::embedder::bytes_to_f32(&bytes);
        if stored.len() != embedding.len() {
            continue;
        }
        let sim = crate::similarity::cosine_similarity(embedding, &stored);
        let dist = crate::similarity::similarity_to_distance(sim);
        if let Some(mt) = &type_filter {
            // Look up the memory's type via a per-row check. For very
            // large candidate sets this should be batched; for the
            // v1.0.76 default namespace size (<10k memories) the
            // per-row lookup is acceptable.
            let actual: Option<String> = conn
                .query_row(
                    "SELECT type FROM memories WHERE id = ?1",
                    params![id],
                    |r| r.get(0),
                )
                .ok();
            if actual.as_deref() != Some(mt.as_str()) {
                continue;
            }
        }
        let _ = ns; // namespace already filtered at SQL level
        candidates.push((id, dist));
    }
    // Sort by distance ascending (best matches first).
    candidates.sort_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(std::cmp::Ordering::Equal));
    candidates.truncate(k);
    Ok(candidates)
}

/// Fetches a live memory by `(namespace, name)` and returns all columns.
/// Fetches a live memory by primary key and returns all columns.
///
/// Mirrors [`read_by_name`] but keyed on `rowid` for use after a KNN search.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn read_full(conn: &Connection, memory_id: i64) -> Result<Option<MemoryRow>, AppError> {
    let mut stmt = conn.prepare_cached(
        "SELECT id, namespace, name, type, description, body, body_hash,
                session_id, source, metadata, created_at, updated_at, deleted_at
         FROM memories WHERE id=?1 AND deleted_at IS NULL",
    )?;
    match stmt.query_row(params![memory_id], |r| {
        Ok(MemoryRow {
            id: r.get(0)?,
            namespace: r.get(1)?,
            name: r.get(2)?,
            memory_type: r.get(3)?,
            description: r.get(4)?,
            body: r.get(5)?,
            body_hash: r.get(6)?,
            session_id: r.get(7)?,
            source: r.get(8)?,
            metadata: r.get(9)?,
            created_at: r.get(10)?,
            updated_at: r.get(11)?,
            deleted_at: r.get(12)?,
        })
    }) {
        Ok(m) => Ok(Some(m)),
        Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
        Err(e) => Err(AppError::Database(e)),
    }
}

/// Fetches all memory_ids in a namespace that are soft-deleted and whose
/// `deleted_at` is older than `before_ts` (unix epoch seconds).
///
/// Used by `purge` to collect stale rows for permanent deletion.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn list_deleted_before(
    conn: &Connection,
    namespace: &str,
    before_ts: i64,
) -> Result<Vec<i64>, AppError> {
    let mut stmt = conn.prepare_cached(
        "SELECT id FROM memories WHERE namespace = ?1 AND deleted_at IS NOT NULL AND deleted_at < ?2",
    )?;
    let ids = stmt
        .query_map(params![namespace, before_ts], |r| r.get::<_, i64>(0))?
        .collect::<Result<Vec<_>, _>>()?;
    Ok(ids)
}

/// Preprocesses a raw user query for FTS5 `MATCH`.
///
/// Technical separators (`-`, `.`, `_`, `/`) are treated as word boundaries by
/// the `unicode61` tokenizer.  When the query contains any of these characters
/// the function builds a compound FTS5 expression:
///   1. A phrase query with the separated tokens (exact compound matching).
///   2. Individual prefix terms joined with OR (broader recall).
///
/// Queries without separators keep the original `term*` prefix behaviour.
fn preprocess_fts_query(raw: &str) -> String {
    const SEPARATORS: &[char] = &['-', '.', '_', '/'];
    const FTS5_SYNTAX: &[char] = &['"', '*', '(', ')', '^', ':'];
    const FTS5_KEYWORDS: &[&str] = &["OR", "AND", "NOT", "NEAR"];

    let sanitized: String = raw.chars().filter(|c| !FTS5_SYNTAX.contains(c)).collect();
    let trimmed = sanitized.trim();
    if trimmed.is_empty() {
        return String::new();
    }

    let is_fts_keyword = |t: &str| FTS5_KEYWORDS.iter().any(|kw| kw.eq_ignore_ascii_case(t));

    if !trimmed.chars().any(|c| SEPARATORS.contains(&c)) {
        return trimmed
            .split_whitespace()
            .filter(|t| !is_fts_keyword(t))
            .map(|t| format!("{t}*"))
            .collect::<Vec<_>>()
            .join(" ");
    }
    let tokens: Vec<&str> = trimmed
        .split(|c: char| SEPARATORS.contains(&c) || c.is_whitespace())
        .filter(|t| !t.is_empty() && !is_fts_keyword(t))
        .collect();
    if tokens.is_empty() {
        return String::new();
    }
    let phrase = format!("\"{}\"", tokens.join(" "));
    let prefix_terms: Vec<String> = tokens.iter().map(|t| format!("{t}*")).collect();
    format!("{phrase} OR {}", prefix_terms.join(" OR "))
}

/// Executes an FTS5 search against `fts_memories` with query preprocessing.
///
/// Technical separators in the query are converted to phrase + prefix OR
/// expressions so compound terms like `graphrag-precompact.sh` match correctly.
///
/// # Errors
///
/// Returns `Err(AppError::Database)` on any `rusqlite` failure.
pub fn fts_search(
    conn: &Connection,
    query: &str,
    namespace: &str,
    memory_type: Option<&str>,
    limit: usize,
) -> Result<Vec<MemoryRow>, AppError> {
    let fts_query = preprocess_fts_query(query);
    if let Some(mt) = memory_type {
        let mut stmt = conn.prepare_cached(
            "SELECT m.id, m.namespace, m.name, m.type, m.description, m.body, m.body_hash,
                    m.session_id, m.source, m.metadata, m.created_at, m.updated_at, m.deleted_at
             FROM fts_memories fts
             JOIN memories m ON m.id = fts.rowid
             WHERE fts_memories MATCH ?1 AND m.namespace = ?2 AND m.type = ?3 AND m.deleted_at IS NULL
             ORDER BY rank LIMIT ?4",
        )?;
        let rows = stmt
            .query_map(params![fts_query, namespace, mt, limit as i64], |r| {
                Ok(MemoryRow {
                    id: r.get(0)?,
                    namespace: r.get(1)?,
                    name: r.get(2)?,
                    memory_type: r.get(3)?,
                    description: r.get(4)?,
                    body: r.get(5)?,
                    body_hash: r.get(6)?,
                    session_id: r.get(7)?,
                    source: r.get(8)?,
                    metadata: r.get(9)?,
                    created_at: r.get(10)?,
                    updated_at: r.get(11)?,
                    deleted_at: r.get(12)?,
                })
            })?
            .collect::<Result<Vec<_>, _>>()?;
        Ok(rows)
    } else {
        let mut stmt = conn.prepare_cached(
            "SELECT m.id, m.namespace, m.name, m.type, m.description, m.body, m.body_hash,
                    m.session_id, m.source, m.metadata, m.created_at, m.updated_at, m.deleted_at
             FROM fts_memories fts
             JOIN memories m ON m.id = fts.rowid
             WHERE fts_memories MATCH ?1 AND m.namespace = ?2 AND m.deleted_at IS NULL
             ORDER BY rank LIMIT ?3",
        )?;
        let rows = stmt
            .query_map(params![fts_query, namespace, limit as i64], |r| {
                Ok(MemoryRow {
                    id: r.get(0)?,
                    namespace: r.get(1)?,
                    name: r.get(2)?,
                    memory_type: r.get(3)?,
                    description: r.get(4)?,
                    body: r.get(5)?,
                    body_hash: r.get(6)?,
                    session_id: r.get(7)?,
                    source: r.get(8)?,
                    metadata: r.get(9)?,
                    created_at: r.get(10)?,
                    updated_at: r.get(11)?,
                    deleted_at: r.get(12)?,
                })
            })?
            .collect::<Result<Vec<_>, _>>()?;
        Ok(rows)
    }
}

/// Syncs FTS5 external-content index after an UPDATE on the memories table.
///
/// The AFTER UPDATE trigger (`trg_fts_au`) is intentionally absent because
/// sqlite-vec loaded via `sqlite3_auto_extension` conflicts with FTS5 inside
/// UPDATE triggers. This function performs the equivalent sync in Rust:
/// DELETE the old entry, then INSERT the new one (external-content FTS5
/// tables do not support in-place UPDATE).
#[allow(clippy::too_many_arguments)]
pub fn sync_fts_after_update(
    conn: &Connection,
    memory_id: i64,
    old_name: &str,
    old_desc: &str,
    old_body: &str,
    new_name: &str,
    new_desc: &str,
    new_body: &str,
) -> Result<(), AppError> {
    conn.execute(
        "INSERT INTO fts_memories(fts_memories, rowid, name, description, body)
         VALUES('delete', ?1, ?2, ?3, ?4)",
        params![memory_id, old_name, old_desc, old_body],
    )?;
    conn.execute(
        "INSERT INTO fts_memories(rowid, name, description, body)
         VALUES(?1, ?2, ?3, ?4)",
        params![memory_id, new_name, new_desc, new_body],
    )?;
    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use rusqlite::Connection;

    type TestResult = Result<(), Box<dyn std::error::Error>>;

    fn setup_conn() -> Result<Connection, Box<dyn std::error::Error>> {
        crate::storage::connection::register_vec_extension();
        let mut conn = Connection::open_in_memory()?;
        conn.execute_batch(
            "PRAGMA foreign_keys = ON;
             PRAGMA temp_store = MEMORY;",
        )?;
        crate::migrations::runner().run(&mut conn)?;
        Ok(conn)
    }

    fn new_memory(name: &str) -> NewMemory {
        NewMemory {
            namespace: "global".to_string(),
            name: name.to_string(),
            memory_type: "user".to_string(),
            description: "descricao de teste".to_string(),
            body: "test memory body".to_string(),
            body_hash: format!("hash-{name}"),
            session_id: None,
            source: "agent".to_string(),
            metadata: serde_json::json!({}),
        }
    }

    #[test]
    fn insert_and_find_by_name_return_id() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-alpha");
        let id = insert(&conn, &m)?;
        assert!(id > 0);

        let found = find_by_name(&conn, "global", "mem-alpha")?;
        assert!(found.is_some());
        let (found_id, _, _) = found.ok_or("mem-alpha should exist")?;
        assert_eq!(found_id, id);
        Ok(())
    }

    #[test]
    fn find_by_name_returns_none_when_not_found() -> TestResult {
        let conn = setup_conn()?;
        let result = find_by_name(&conn, "global", "inexistente")?;
        assert!(result.is_none());
        Ok(())
    }

    #[test]
    fn find_by_hash_returns_correct_id() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-hash");
        let id = insert(&conn, &m)?;

        let found = find_by_hash(&conn, "global", "hash-mem-hash")?;
        assert_eq!(found, Some(id));
        Ok(())
    }

    #[test]
    fn find_by_hash_returns_none_when_hash_not_found() -> TestResult {
        let conn = setup_conn()?;
        let result = find_by_hash(&conn, "global", "hash-inexistente")?;
        assert!(result.is_none());
        Ok(())
    }

    #[test]
    fn find_by_hash_ignores_different_namespace() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-ns");
        insert(&conn, &m)?;

        let result = find_by_hash(&conn, "outro-namespace", "hash-mem-ns")?;
        assert!(result.is_none());
        Ok(())
    }

    #[test]
    fn read_by_name_returns_full_memory() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-read");
        let id = insert(&conn, &m)?;

        let row = read_by_name(&conn, "global", "mem-read")?.ok_or("mem-read should exist")?;
        assert_eq!(row.id, id);
        assert_eq!(row.name, "mem-read");
        assert_eq!(row.memory_type, "user");
        assert_eq!(row.body, "test memory body");
        assert_eq!(row.namespace, "global");
        Ok(())
    }

    #[test]
    fn read_by_name_returns_none_for_missing() -> TestResult {
        let conn = setup_conn()?;
        let result = read_by_name(&conn, "global", "nao-existe")?;
        assert!(result.is_none());
        Ok(())
    }

    #[test]
    fn read_full_by_id_returns_memory() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-full");
        let id = insert(&conn, &m)?;

        let row = read_full(&conn, id)?.ok_or("mem-full should exist")?;
        assert_eq!(row.id, id);
        assert_eq!(row.name, "mem-full");
        Ok(())
    }

    #[test]
    fn read_full_returns_none_for_missing_id() -> TestResult {
        let conn = setup_conn()?;
        let result = read_full(&conn, 9999)?;
        assert!(result.is_none());
        Ok(())
    }

    #[test]
    fn update_without_optimism_modifies_fields() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-upd");
        let id = insert(&conn, &m)?;

        let mut m2 = new_memory("mem-upd");
        m2.body = "updated body".to_string();
        m2.body_hash = "hash-novo".to_string();
        let ok = update(&conn, id, &m2, None)?;
        assert!(ok);

        let row = read_full(&conn, id)?.ok_or("mem-upd should exist")?;
        assert_eq!(row.body, "updated body");
        assert_eq!(row.body_hash, "hash-novo");
        Ok(())
    }

    #[test]
    fn update_with_correct_expected_updated_at_succeeds() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-opt");
        let id = insert(&conn, &m)?;

        let (_, updated_at, _) =
            find_by_name(&conn, "global", "mem-opt")?.ok_or("mem-opt should exist")?;

        let mut m2 = new_memory("mem-opt");
        m2.body = "optimistic body".to_string();
        m2.body_hash = "hash-optimistic".to_string();
        let ok = update(&conn, id, &m2, Some(updated_at))?;
        assert!(ok);

        let row = read_full(&conn, id)?.ok_or("mem-opt should exist after update")?;
        assert_eq!(row.body, "optimistic body");
        Ok(())
    }

    #[test]
    fn update_with_wrong_expected_updated_at_returns_false() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-conflict");
        let id = insert(&conn, &m)?;

        let mut m2 = new_memory("mem-conflict");
        m2.body = "must not appear".to_string();
        m2.body_hash = "hash-x".to_string();
        let ok = update(&conn, id, &m2, Some(0))?;
        assert!(!ok);

        let row = read_full(&conn, id)?.ok_or("mem-conflict should exist")?;
        assert_eq!(row.body, "test memory body");
        Ok(())
    }

    #[test]
    fn update_missing_id_returns_false() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("fantasma");
        let ok = update(&conn, 9999, &m, None)?;
        assert!(!ok);
        Ok(())
    }

    #[test]
    fn soft_delete_marks_deleted_at() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-del");
        insert(&conn, &m)?;

        let ok = soft_delete(&conn, "global", "mem-del")?;
        assert!(ok);

        let result = find_by_name(&conn, "global", "mem-del")?;
        assert!(result.is_none());

        let result_read = read_by_name(&conn, "global", "mem-del")?;
        assert!(result_read.is_none());
        Ok(())
    }

    #[test]
    fn soft_delete_returns_false_when_not_found() -> TestResult {
        let conn = setup_conn()?;
        let ok = soft_delete(&conn, "global", "nao-existe")?;
        assert!(!ok);
        Ok(())
    }

    #[test]
    fn double_soft_delete_returns_false_on_second_call() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-del2");
        insert(&conn, &m)?;

        soft_delete(&conn, "global", "mem-del2")?;
        let ok = soft_delete(&conn, "global", "mem-del2")?;
        assert!(!ok);
        Ok(())
    }

    #[test]
    fn list_returns_memories_from_namespace() -> TestResult {
        let conn = setup_conn()?;
        insert(&conn, &new_memory("mem-list-a"))?;
        insert(&conn, &new_memory("mem-list-b"))?;

        let rows = list(&conn, "global", None, 10, 0, false)?;
        assert!(rows.len() >= 2);
        let nomes: Vec<_> = rows.iter().map(|r| r.name.as_str()).collect();
        assert!(nomes.contains(&"mem-list-a"));
        assert!(nomes.contains(&"mem-list-b"));
        Ok(())
    }

    #[test]
    fn list_with_type_filter_returns_only_correct_type() -> TestResult {
        let conn = setup_conn()?;
        insert(&conn, &new_memory("mem-user"))?;

        let mut m2 = new_memory("mem-feedback");
        m2.memory_type = "feedback".to_string();
        insert(&conn, &m2)?;

        let rows_user = list(&conn, "global", Some("user"), 10, 0, false)?;
        assert!(rows_user.iter().all(|r| r.memory_type == "user"));

        let rows_fb = list(&conn, "global", Some("feedback"), 10, 0, false)?;
        assert!(rows_fb.iter().all(|r| r.memory_type == "feedback"));
        Ok(())
    }

    #[test]
    fn list_exclui_soft_deleted() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-excluida");
        insert(&conn, &m)?;
        soft_delete(&conn, "global", "mem-excluida")?;

        let rows = list(&conn, "global", None, 10, 0, false)?;
        assert!(rows.iter().all(|r| r.name != "mem-excluida"));
        Ok(())
    }

    #[test]
    fn list_pagination_works() -> TestResult {
        let conn = setup_conn()?;
        for i in 0..5 {
            insert(&conn, &new_memory(&format!("mem-pag-{i}")))?;
        }

        let pagina1 = list(&conn, "global", None, 2, 0, false)?;
        let pagina2 = list(&conn, "global", None, 2, 2, false)?;
        assert!(pagina1.len() <= 2);
        assert!(pagina2.len() <= 2);
        if !pagina1.is_empty() && !pagina2.is_empty() {
            assert_ne!(pagina1[0].id, pagina2[0].id);
        }
        Ok(())
    }

    #[test]
    #[serial_test::serial(env)]
    fn upsert_vec_and_delete_vec_work() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-vec");
        let id = insert(&conn, &m)?;

        let embedding: Vec<f32> = vec![0.1; crate::constants::embedding_dim()];
        upsert_vec(
            &conn, id, "global", "user", &embedding, "mem-vec", "snippet",
        )?;

        let count: i64 = conn.query_row(
            "SELECT COUNT(*) FROM memory_embeddings WHERE memory_id = ?1",
            params![id],
            |r| r.get(0),
        )?;
        assert_eq!(count, 1);

        delete_vec(&conn, id)?;

        let count_after: i64 = conn.query_row(
            "SELECT COUNT(*) FROM memory_embeddings WHERE memory_id = ?1",
            params![id],
            |r| r.get(0),
        )?;
        assert_eq!(count_after, 0);
        Ok(())
    }

    #[test]
    #[serial_test::serial(env)]
    fn upsert_vec_replaces_existing_vector() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-vec-upsert");
        let id = insert(&conn, &m)?;

        let emb1: Vec<f32> = vec![0.1; crate::constants::embedding_dim()];
        upsert_vec(&conn, id, "global", "user", &emb1, "mem-vec-upsert", "s1")?;

        let emb2: Vec<f32> = vec![0.9; crate::constants::embedding_dim()];
        upsert_vec(&conn, id, "global", "user", &emb2, "mem-vec-upsert", "s2")?;

        let count: i64 = conn.query_row(
            "SELECT COUNT(*) FROM memory_embeddings WHERE memory_id = ?1",
            params![id],
            |r| r.get(0),
        )?;
        assert_eq!(count, 1);
        Ok(())
    }

    #[test]
    #[serial_test::serial(env)]
    fn knn_search_returns_results_by_distance() -> TestResult {
        let conn = setup_conn()?;

        // emb_a: predominantemente positivo — cosseno alto com a query toda-uns
        let ma = new_memory("mem-knn-a");
        let id_a = insert(&conn, &ma)?;
        let emb_a: Vec<f32> = vec![1.0; crate::constants::embedding_dim()];
        upsert_vec(&conn, id_a, "global", "user", &emb_a, "mem-knn-a", "s")?;

        // emb_b: predominantemente negativo — cosseno baixo com a query toda-uns
        let mb = new_memory("mem-knn-b");
        let id_b = insert(&conn, &mb)?;
        let emb_b: Vec<f32> = vec![-1.0; crate::constants::embedding_dim()];
        upsert_vec(&conn, id_b, "global", "user", &emb_b, "mem-knn-b", "s")?;

        let query: Vec<f32> = vec![1.0; crate::constants::embedding_dim()];
        let results = knn_search(&conn, &query, &["global".to_string()], None, 2)?;
        assert!(!results.is_empty());
        assert_eq!(results[0].0, id_a);
        Ok(())
    }

    #[test]
    #[serial_test::serial(env)]
    fn knn_search_with_type_filter_restricts_result() -> TestResult {
        let conn = setup_conn()?;

        let ma = new_memory("mem-knn-tipo-user");
        let id_a = insert(&conn, &ma)?;
        let emb: Vec<f32> = vec![1.0; crate::constants::embedding_dim()];
        upsert_vec(
            &conn,
            id_a,
            "global",
            "user",
            &emb,
            "mem-knn-tipo-user",
            "s",
        )?;

        let mut mb = new_memory("mem-knn-tipo-fb");
        mb.memory_type = "feedback".to_string();
        let id_b = insert(&conn, &mb)?;
        upsert_vec(
            &conn,
            id_b,
            "global",
            "feedback",
            &emb,
            "mem-knn-tipo-fb",
            "s",
        )?;

        let query: Vec<f32> = vec![1.0; crate::constants::embedding_dim()];
        let results_user = knn_search(&conn, &query, &["global".to_string()], Some("user"), 5)?;
        assert!(results_user.iter().all(|(id, _)| *id == id_a));

        let results_fb = knn_search(&conn, &query, &["global".to_string()], Some("feedback"), 5)?;
        assert!(results_fb.iter().all(|(id, _)| *id == id_b));
        Ok(())
    }

    #[test]
    fn fts_search_finds_by_prefix_in_body() -> TestResult {
        let conn = setup_conn()?;
        let mut m = new_memory("mem-fts");
        m.body = "linguagem de programacao rust".to_string();
        insert(&conn, &m)?;

        conn.execute_batch(
            "INSERT INTO fts_memories(rowid, name, description, body)
             SELECT id, name, description, body FROM memories WHERE deleted_at IS NULL",
        )?;

        let rows = fts_search(&conn, "programacao", "global", None, 10)?;
        assert!(!rows.is_empty());
        assert!(rows.iter().any(|r| r.name == "mem-fts"));
        Ok(())
    }

    #[test]
    fn fts_search_with_type_filter() -> TestResult {
        let conn = setup_conn()?;
        let mut m = new_memory("mem-fts-tipo");
        m.body = "linguagem especial para filtro".to_string();
        insert(&conn, &m)?;

        let mut m2 = new_memory("mem-fts-feedback");
        m2.memory_type = "feedback".to_string();
        m2.body = "linguagem especial para filtro".to_string();
        insert(&conn, &m2)?;

        conn.execute_batch(
            "INSERT INTO fts_memories(rowid, name, description, body)
             SELECT id, name, description, body FROM memories WHERE deleted_at IS NULL",
        )?;

        let rows_user = fts_search(&conn, "especial", "global", Some("user"), 10)?;
        assert!(rows_user.iter().all(|r| r.memory_type == "user"));

        let rows_fb = fts_search(&conn, "especial", "global", Some("feedback"), 10)?;
        assert!(rows_fb.iter().all(|r| r.memory_type == "feedback"));
        Ok(())
    }

    #[test]
    fn fts_search_excludes_deleted() -> TestResult {
        let conn = setup_conn()?;
        let mut m = new_memory("mem-fts-del");
        m.body = "deleted fts content".to_string();
        insert(&conn, &m)?;

        conn.execute_batch(
            "INSERT INTO fts_memories(rowid, name, description, body)
             SELECT id, name, description, body FROM memories WHERE deleted_at IS NULL",
        )?;

        soft_delete(&conn, "global", "mem-fts-del")?;

        let rows = fts_search(&conn, "deleted", "global", None, 10)?;
        assert!(rows.iter().all(|r| r.name != "mem-fts-del"));
        Ok(())
    }

    #[test]
    fn list_deleted_before_returns_correct_ids() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-purge");
        insert(&conn, &m)?;
        soft_delete(&conn, "global", "mem-purge")?;

        let ids = list_deleted_before(&conn, "global", i64::MAX)?;
        assert!(!ids.is_empty());

        let ids_antes = list_deleted_before(&conn, "global", 0)?;
        assert!(ids_antes.is_empty());
        Ok(())
    }

    #[test]
    fn find_by_name_returns_correct_max_version() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-ver");
        let id = insert(&conn, &m)?;

        let (_, _, v0) = find_by_name(&conn, "global", "mem-ver")?.ok_or("mem-ver should exist")?;
        assert_eq!(v0, 0);

        conn.execute(
            "INSERT INTO memory_versions (memory_id, version, name, type, description, body, metadata, change_reason)
             VALUES (?1, 1, 'mem-ver', 'user', 'desc', 'body', '{}', 'create')",
            params![id],
        )?;

        let (_, _, v1) =
            find_by_name(&conn, "global", "mem-ver")?.ok_or("mem-ver should exist after insert")?;
        assert_eq!(v1, 1);
        Ok(())
    }

    #[test]
    fn insert_com_metadata_json() -> TestResult {
        let conn = setup_conn()?;
        let mut m = new_memory("mem-meta");
        m.metadata = serde_json::json!({"chave": "valor", "numero": 42});
        let id = insert(&conn, &m)?;

        let row = read_full(&conn, id)?.ok_or("mem-meta should exist")?;
        let meta: serde_json::Value = serde_json::from_str(&row.metadata)?;
        assert_eq!(meta["chave"], "valor");
        assert_eq!(meta["numero"], 42);
        Ok(())
    }

    #[test]
    fn insert_com_session_id() -> TestResult {
        let conn = setup_conn()?;
        let mut m = new_memory("mem-session");
        m.session_id = Some("sessao-xyz".to_string());
        let id = insert(&conn, &m)?;

        let row = read_full(&conn, id)?.ok_or("mem-session should exist")?;
        assert_eq!(row.session_id, Some("sessao-xyz".to_string()));
        Ok(())
    }

    #[test]
    fn delete_vec_for_nonexistent_id_does_not_fail() -> TestResult {
        let conn = setup_conn()?;
        let result = delete_vec(&conn, 99999);
        assert!(result.is_ok());
        Ok(())
    }

    #[test]
    fn preprocess_fts_query_no_separators() {
        assert_eq!(preprocess_fts_query("hello"), "hello*");
        assert_eq!(preprocess_fts_query("hello world"), "hello* world*");
    }

    #[test]
    fn preprocess_fts_query_with_hyphens() {
        let result = preprocess_fts_query("graphrag-precompact");
        assert!(result.contains("\"graphrag precompact\""));
        assert!(result.contains("graphrag*"));
        assert!(result.contains("precompact*"));
    }

    #[test]
    fn preprocess_fts_query_with_dots() {
        let result = preprocess_fts_query("v1.0.44");
        assert!(result.contains("\"v1 0 44\""));
        assert!(result.contains("v1*"));
        assert!(result.contains("44*"));
    }

    #[test]
    fn preprocess_fts_query_with_mixed_separators() {
        let result = preprocess_fts_query("graphrag-precompact.sh");
        assert!(result.contains("\"graphrag precompact sh\""));
        assert!(result.contains("graphrag*"));
    }

    #[test]
    fn preprocess_fts_query_empty_and_whitespace() {
        assert_eq!(preprocess_fts_query(""), "");
        assert_eq!(preprocess_fts_query("  "), "");
    }

    #[test]
    fn preprocess_fts_query_strips_quotes() {
        let result = preprocess_fts_query(r#"hello "world"#);
        assert!(result.contains("hello*"));
        assert!(result.contains("world*"));
    }

    #[test]
    fn preprocess_fts_query_strips_asterisks() {
        assert_eq!(preprocess_fts_query("test*"), "test*");
    }

    #[test]
    fn preprocess_fts_query_strips_parens() {
        let result = preprocess_fts_query("(hello)");
        assert!(result.contains("hello*"));
        assert!(!result.contains('('));
    }

    #[test]
    fn preprocess_fts_query_filters_fts_keywords() {
        let result = preprocess_fts_query("foo OR bar");
        assert!(result.contains("foo*"));
        assert!(result.contains("bar*"));
        assert!(!result.contains("OR*"));
    }

    #[test]
    fn preprocess_fts_query_only_fts_keywords() {
        assert_eq!(preprocess_fts_query("OR AND NOT"), "");
    }

    #[test]
    fn preprocess_fts_query_keywords_with_separators() {
        let result = preprocess_fts_query("hello-OR-world");
        assert!(result.contains("hello*"));
        assert!(result.contains("world*"));
        assert!(!result.contains("OR*"));
    }

    #[test]
    fn fts_search_finds_compound_term_with_hyphen() -> TestResult {
        let conn = setup_conn()?;
        let mut m = new_memory("mem-compound");
        m.body = "the graphrag-precompact script runs daily".to_string();
        insert(&conn, &m)?;
        conn.execute_batch(
            "INSERT INTO fts_memories(rowid, name, description, body)
             SELECT id, name, description, body FROM memories WHERE deleted_at IS NULL",
        )?;
        let rows = fts_search(&conn, "graphrag-precompact", "global", None, 10)?;
        assert!(!rows.is_empty(), "should find compound hyphenated term");
        Ok(())
    }

    #[test]
    fn find_by_name_any_state_returns_deleted_flag() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-soft-del");
        let id = insert(&conn, &m)?;
        conn.execute(
            "UPDATE memories SET deleted_at = unixepoch() WHERE id = ?1",
            rusqlite::params![id],
        )?;
        let result = find_by_name_any_state(&conn, "global", "mem-soft-del")?;
        assert_eq!(result, Some((id, true)));
        Ok(())
    }

    #[test]
    fn find_by_name_any_state_returns_not_deleted() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-active");
        let id = insert(&conn, &m)?;
        let result = find_by_name_any_state(&conn, "global", "mem-active")?;
        assert_eq!(result, Some((id, false)));
        Ok(())
    }

    #[test]
    fn find_by_name_any_state_returns_none_when_absent() -> TestResult {
        let conn = setup_conn()?;
        let result = find_by_name_any_state(&conn, "global", "does-not-exist")?;
        assert!(result.is_none());
        Ok(())
    }

    #[test]
    fn clear_deleted_at_restores_memory() -> TestResult {
        let conn = setup_conn()?;
        let m = new_memory("mem-restore");
        let id = insert(&conn, &m)?;
        conn.execute(
            "UPDATE memories SET deleted_at = unixepoch() WHERE id = ?1",
            rusqlite::params![id],
        )?;
        // Soft-deleted: find_by_name should return None.
        assert!(find_by_name(&conn, "global", "mem-restore")?.is_none());
        clear_deleted_at(&conn, id)?;
        // Restored: find_by_name should return Some again.
        let found = find_by_name(&conn, "global", "mem-restore")?;
        assert!(found.is_some());
        assert_eq!(found.unwrap().0, id);
        Ok(())
    }
}