/** Minimum mean trigram Jaccard similarity for a typo-tolerant fallback match. */
export declare const TYPO_FALLBACK_MIN_MEAN_SIMILARITY = 0.3;
/**
 * Trigram Jaccard similarity at or above which a new observation is treated
 * as a near-duplicate rewording of an existing row and replaces it.
 */
export declare const NEAR_DUPLICATE_SIMILARITY = 0.9;
/**
 * Final ranking score for a candidate observation: a weighted blend of
 * normalized text-match quality, relevance tag and recency decay. Every
 * component is in [0, 1]; higher is better.
 */
export declare function scoreObservation(textScore: number, relevance: string, createdAt: number, now: number): number;
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