export declare function recordUsage(userId: string, queryType: string, queryText: string, responseTimeMs: number): Promise<void>;
export declare function getDailyUsage(userId: string): Promise<number>;
export declare function canMakeQuery(userId: string, _plan?: string): Promise<{
    allowed: boolean;
    remaining: number;
    limit: number;
}>;
export declare function getUsageStats(userId: string, days?: number): Promise<any[]>;
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