/**
 * Adaptive Compressor — progressive compression tiers based on observation age.
 *
 * Tiers:
 * - verbatim (0-7 days): Original content intact
 * - light (7-30 days): Key sentences retained
 * - medium (30-90 days): Summarizer-level compression
 * - distilled (90+ days): Facts-only extraction
 *
 * Rules:
 * - pinned=true → always verbatim, never compress
 * - importance_score >= 0.8 → skip one tier (compress slower)
 */
export type CompressionTier = 'verbatim' | 'light' | 'medium' | 'distilled';
export interface TierThresholds {
    light_days: number;
    medium_days: number;
    distilled_days: number;
}
/**
 * Determine the target compression tier for an observation.
 */
export declare function getTargetTier(indexed_at: number, importance_score: number, pinned: boolean, thresholds?: Partial<TierThresholds>): CompressionTier;
/**
 * Compress content to a target tier.
 */
export declare function compressToTier(content: string, summary: string | null, targetTier: CompressionTier): string;
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