/**
 * Manages a single SQLite database connection.
 */
export declare class SqliteManager {
    private db;
    private filePath;
    /**
     * Open an SQLite database file.
     */
    open(filePath: string): {
        success: boolean;
        message: string;
    };
    /**
     * Close the current database connection.
     */
    close(): {
        success: boolean;
        message: string;
    };
    /**
     * Get the current database status.
     */
    status(): {
        isOpen: boolean;
        filePath: string | null;
        memoryUsage: number | null;
        tables: number | null;
    };
    /**
     * Execute a read-only SELECT query.
     */
    query(sql: string, params?: Record<string, unknown>): {
        columns: string[];
        rows: unknown[][];
        rowCount: number;
    };
    /**
     * Execute a write operation (INSERT, UPDATE, DELETE, CREATE, DROP, ALTER).
     */
    execute(sql: string, params?: Record<string, unknown>): {
        changes: number;
        lastInsertRowid: number | bigint;
    };
    /**
     * List all tables in the database.
     */
    listTables(): {
        tables: string[];
    };
    /**
     * Describe the schema of a specific table.
     */
    describeTable(tableName: string): {
        name: string;
        columns: {
            cid: number;
            name: string;
            type: string;
            notnull: boolean;
            defaultValue: unknown;
            pk: boolean;
        }[];
        rowCount: number;
    };
    /**
     * Ensure the database is open before running a query.
     */
    private ensureOpen;
}
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