import type { SqliteAdapter as Database } from '../db/sqlite-adapter.js';
export interface SpikeInfo {
    date: string;
    cost_usd: number;
    average_usd: number;
    ratio: number;
}
/** Detect daily cost spikes: today > 2× rolling 7-day mean (min 7 days history). */
export declare function detectCostSpikes(dailyTotals: Array<{
    date: string;
    cost_usd: number;
}>, opts?: {
    windowDays?: number;
    multiplier?: number;
}): SpikeInfo[];
export declare function queryRecentSpikes(db: Database, days?: number): SpikeInfo[];
export declare function getTodaySpike(db: Database): SpikeInfo | null;
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