import { default as Database } from 'better-sqlite3';
import { TranscriptMetadata } from './types.js';
/**
 * Save metadata to database
 */
export declare function saveMetadata(db: Database.Database, metadata: TranscriptMetadata): void;
/**
 * Load metadata from database
 */
export declare function loadMetadata(db: Database.Database): TranscriptMetadata;
/**
 * Update specific metadata fields and return changes for audit logging
 */
export declare function updateMetadata(db: Database.Database, updates: Partial<TranscriptMetadata>): Array<{
    field: string;
    oldValue: unknown;
    newValue: unknown;
}>;
/**
 * Get a single metadata value
 */
export declare function getMetadataValue(db: Database.Database, key: string): string | null;
/**
 * Delete a metadata key
 */
export declare function deleteMetadataKey(db: Database.Database, key: string): boolean;
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