export interface OptimizationResult {
    originalTextHash: string;
    optimizedText: string;
    originalTokens: number;
    optimizedTokens: number;
    tokensSaved: number;
}
export declare function getDefaultOptimizationDbPath(): string;
export declare class SqliteOptimizationStorage {
    private db;
    private readonly dbPath;
    private readonly compressionEngine;
    constructor(dbPath?: string);
    initializeDatabase(): void;
    private requireDb;
    save(entry: OptimizationResult): void;
    get(originalTextHash: string): OptimizationResult | null;
    /**
     * Decode a stored payload using the persisted algorithm label. Keeps
     * the door open for additional algorithms (gzip, zstd) without
     * touching the read path, and surfaces an explicit error for
     * unknown labels instead of silently corrupting data.
     */
    private decodePayload;
    /** Algorithm label paired with the current CompressionEngine. */
    static readonly COMPRESSION_ALGORITHM = "brotli";
    close(): void;
}
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