import type { DatabaseAdapter } from '../db-manager.js';
export type CaseFreshnessState = 'fresh' | 'stale' | 'drifted' | 'unknown';
export interface CaseFreshnessReason {
    code: 'missing_compile' | 'activity_after_compile' | 'state_update_after_compile' | 'wiki_index_missing' | 'timestamps_absent';
    penalty: number;
    detail?: string;
}
export interface CaseFreshnessCalculation {
    freshness_score: number;
    freshness_state: CaseFreshnessState;
    freshness_score_is_drifted: 0 | 1;
    freshness_drift_threshold: number;
    reasons: CaseFreshnessReason[];
    freshness_reason_json: string;
}
export interface CaseFreshnessResult extends CaseFreshnessCalculation {
    case_id: string;
    terminal_case_id: string;
    resolved_via_case_id: string | null;
    chain: string[];
    freshness_checked_at: string;
    changed: boolean;
}
export interface SweepCaseFreshnessInput {
    case_ids?: string[];
    now?: string;
    drift_threshold?: number;
}
export interface SweepCaseFreshnessResult {
    checked: number;
    fresh: number;
    stale: number;
    drifted: number;
    drifted_case_ids: string[];
    results: CaseFreshnessResult[];
    rejected?: Array<{
        case_id: string;
        code: 'case.terminal_status';
        message: string;
    }>;
}
export declare function calculateCaseFreshness(input: {
    last_activity_at?: string | null;
    state_updated_at?: string | null;
    compiled_at?: string | null;
    wiki_index_updated_at?: string | null;
    current_wiki_path?: string | null;
    drift_threshold?: number;
    now?: string;
}): CaseFreshnessCalculation;
export declare function sweepCaseFreshness(adapter: DatabaseAdapter, input?: SweepCaseFreshnessInput): SweepCaseFreshnessResult;
export declare function listDriftedCases(adapter: DatabaseAdapter): Array<{
    case_id: string;
    freshness_score: number;
    freshness_checked_at: string | null;
}>;
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