Struct CostObservation 

pub struct CostObservation {
    pub intent: String,
    pub model: String,
    pub tokens_approx: usize,
    pub cost_usd: f64,
    pub response_fingerprint: String,
    pub recorded_at: Instant,
}

A single cost observation recorded for one inference call.

Fields

intent: String

First 64 chars of the prompt (intent key).

model: String

Model used.

tokens_approx: usize

Approximate token count (prompt_chars + response_chars) / 4.

cost_usd: f64

Actual cost in USD (computed from tokens × model rate).

response_fingerprint: String

A simple fingerprint of the response (first 32 chars, lowercased).

recorded_at: Instant

When this observation was recorded.

Trait Implementations

impl Clone for CostObservation

fn clone(&self) -> CostObservation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CostObservation

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

Formats the value using the given formatter.