/**
 * Migration utilities for upgrading old threads to support new features.
 */
export interface MigrationResult {
    threadName: string;
    messagesTotal: number;
    embeddingsGenerated: number;
    sessionCreated: boolean;
    sessionExchanges: number;
    errors: string[];
}
export interface MigrationProgress {
    phase: 'loading' | 'embeddings' | 'sessions' | 'done';
    current: number;
    total: number;
    message: string;
}
export type ProgressCallback = (progress: MigrationProgress) => void;
/**
 * Migrate a thread to support RAG features.
 * - Generates embeddings for all messages
 * - Creates a legacy session document from old conversations
 */
export declare function migrateThread(threadPath: string, onProgress?: ProgressCallback): Promise<MigrationResult>;
/**
 * Check if a thread needs migration.
 * Returns true if embeddings or sessions are missing.
 */
export declare function needsMigration(threadPath: string): Promise<{
    needsEmbeddings: boolean;
    needsSessions: boolean;
    messageCount: number;
    embeddingCount: number;
}>;
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