Struct SearchConfig 

pub struct SearchConfig {

    pub bm25_weight: f64,
    pub vector_weight: f64,
    pub rrf_k: f64,
    pub candidate_pool_size: usize,
    pub default_top_k: usize,
    pub min_similarity: f64,
    pub recency_half_life_days: Option<f64>,
    pub recency_weight: f64,
    pub rerank_from_f32: bool,
    pub derived_vector_backend: DerivedVectorBackendPolicy,
    pub turbo_quant_bits: u8,
    pub turbo_quant_projections: usize,
    pub turbo_quant_seed: u64,
    pub turbo_quant_require_exact_rerank: bool,
    pub fib_quant_require_exact_rerank: bool,
    pub fib_quant_block_count: usize,
    pub per_dim_bits: u8,
    pub per_dim_require_exact_rerank: bool,
}

Search tuning parameters.

Fields

bm25_weight: f64

Weight for BM25 score in RRF fusion.

vector_weight: f64

Weight for vector similarity in RRF fusion.

rrf_k: f64

RRF constant (k). Controls rank importance decay.

candidate_pool_size: usize

Number of candidates from each search method before fusion.

default_top_k: usize

Default number of results to return.

min_similarity: f64

Minimum cosine similarity threshold for vector candidates.

recency_half_life_days: Option<f64>

Optional recency boost. If enabled, results are boosted based on how recently they were created/updated. The value is the half-life in days — a fact that is recency_half_life_days old gets 50% of the recency boost. None = no recency weighting (current behavior, default).

recency_weight: f64

Weight of the recency boost relative to BM25 and vector scores in RRF. Only used when recency_half_life_days is Some. Default: 0.5

rerank_from_f32: bool

When true, rerank top HNSW candidates using exact f32 cosine similarity from SQLite. Improves recall at the cost of one batched SQL query. Only applies when HNSW feature is enabled. Default: true

derived_vector_backend: DerivedVectorBackendPolicy

Optional derived-vector candidate backend. Disabled by default because raw f32 embeddings remain authoritative.

turbo_quant_bits: u8

TurboQuant polar angle bits when the TurboQuant candidate backend is enabled.

turbo_quant_projections: usize

TurboQuant QJL projection count when the TurboQuant candidate backend is enabled.

turbo_quant_seed: u64

TurboQuant profile seed when the TurboQuant candidate backend is enabled.

turbo_quant_require_exact_rerank: bool

Require exact f32 rerank for TurboQuant candidates. Defaults to true.

fib_quant_require_exact_rerank: bool

Require exact f32 reranking when the FibQuant candidate backend is enabled.

fib_quant_block_count: usize

Number of FibQuant blocks when the FibQuant candidate backend is enabled.

per_dim_bits: u8

per_dim_require_exact_rerank: bool

Trait Implementations

impl Clone for SearchConfig

fn clone(&self) -> SearchConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SearchConfig

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

Formats the value using the given formatter.

impl Default for SearchConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SearchConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SearchConfig

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.