export interface DatabaseMaintenanceOptions {
    connectionString: string;
}
/**
 * Database maintenance utilities for cleaning up invalid data
 */
export declare class DatabaseMaintenance {
    protected readonly logger: import("global-logger-factory").Logger<unknown>;
    private readonly pool;
    constructor(options: DatabaseMaintenanceOptions);
    /**
     * Clean up invalid JSON values from key-value storage tables
     */
    cleanInvalidJsonValues(tableName?: string): Promise<number>;
    /**
     * Get statistics about the database tables
     */
    getTableStats(): Promise<Record<string, number>>;
    /**
     * Close the database connection
     */
    close(): Promise<void>;
}