/**
 * Usage Logger
 *
 * Centralized logging of AI usage for metering and billing.
 */
export interface UsageLogInput {
    userId: string;
    accountId?: string;
    provider: "openai" | "replit";
    model: string;
    requestKind: string;
    promptTokens?: number;
    completionTokens?: number;
    totalTokens?: number;
    billingUnit?: "token" | "checkpoint" | "credit" | "effort";
    unitsUsed?: number;
    unitCostUsd: number;
    effectiveCostUsd: number;
    traceId?: string;
    requestId?: string;
}
/**
 * Log AI usage to database
 */
export declare function logUsage(input: UsageLogInput): Promise<void>;
/**
 * Get global daily cost
 */
export declare function getGlobalDailyCost(): Promise<number>;
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