/**
 * Eviction Algorithm - Remove low-score patterns
 *
 * Keeps top N patterns per phase (default 100) based on score.
 * Protects high-frequency (≥5) and recent (≤7 days) patterns.
 */
import type { MetaPattern, Phase } from '../core/schema.js';
/**
 * Eviction policy
 */
export interface EvictionPolicy {
    /** Maximum patterns per phase */
    maxPerPhase: number;
    /** Protect patterns with frequency >= this value */
    protectFrequency: number;
    /** Protect patterns seen within this many days */
    protectDays: number;
}
/**
 * Default eviction policy
 */
export declare const DEFAULT_EVICTION_POLICY: EvictionPolicy;
/**
 * Evict low-score patterns
 *
 * @param patterns - Patterns to evict from
 * @param policy - Eviction policy
 * @returns Kept patterns
 */
export declare function evictLowScorePatterns(patterns: MetaPattern[], policy?: EvictionPolicy): MetaPattern[];
/**
 * Get eviction candidates (patterns that would be removed)
 *
 * @param patterns - Patterns to analyze
 * @param policy - Eviction policy
 * @returns Patterns that would be evicted
 */
export declare function getEvictionCandidates(patterns: MetaPattern[], policy?: EvictionPolicy): MetaPattern[];
/**
 * Get eviction statistics
 *
 * @param patterns - Patterns to analyze
 * @param policy - Eviction policy
 * @returns Statistics
 */
export declare function getEvictionStats(patterns: MetaPattern[], policy?: EvictionPolicy): {
    total: number;
    toKeep: number;
    toEvict: number;
    protected: number;
    byPhase: Record<Phase, {
        total: number;
        toKeep: number;
        toEvict: number;
    }>;
};
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