export interface TokenUsageRecord {
    id?: number;
    provider: string;
    model: string;
    tokensUsed: number;
    promptTokens?: number;
    completionTokens?: number;
    operation: string;
    timestamp: Date;
    cost?: number;
    sessionId: string;
}
export interface UsageStatistics {
    totalTokens: number;
    totalCost: number;
    operationCounts: Record<string, number>;
    providerCounts: Record<string, number>;
    modelCounts: Record<string, number>;
    lastUsage: Date | null;
    sessionsCount: number;
}
export declare class DatabaseManager {
    private db?;
    private dbPath;
    private sessionId;
    constructor();
    initialize(): Promise<void>;
    private createTables;
    recordTokenUsage(record: Omit<TokenUsageRecord, 'id' | 'timestamp' | 'sessionId'>): Promise<void>;
    getUsageStatistics(days?: number): Promise<UsageStatistics>;
    getUsageHistory(limit?: number, provider?: string): Promise<TokenUsageRecord[]>;
    clearUsageHistory(days?: number): Promise<number>;
    setSetting(key: string, value: string): Promise<void>;
    getSetting(key: string): Promise<string | null>;
    exportUsageData(): Promise<any>;
    getCurrentSessionId(): string;
    private generateSessionId;
    close(): Promise<void>;
    vacuum(): Promise<void>;
    getDatabaseInfo(): Promise<{
        path: string;
        size: number;
        totalRecords: number;
        sessionId: string;
    }>;
}
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