/**
 * DeletionService - Handle selective deletion of conversations by topic/keyword
 * Uses semantic + FTS5 search to find matching conversations
 */
import type Database from "better-sqlite3";
import { type BackupMetadata } from "./BackupManager.js";
import type { ConversationStorage } from "./ConversationStorage.js";
import type { SemanticSearch } from "../search/SemanticSearch.js";
/**
 * Deletion preview - shows what would be deleted
 */
export interface DeletionPreview {
    conversationIds: string[];
    conversations: Array<{
        id: string;
        session_id: string;
        created_at: number;
        message_count: number;
    }>;
    totalMessages: number;
    totalDecisions: number;
    totalMistakes: number;
    summary: string;
}
/**
 * Deletion result - what was actually deleted
 */
export interface DeletionResult {
    backup: BackupMetadata;
    deleted: {
        conversations: number;
        messages: number;
        decisions: number;
        mistakes: number;
        toolUses: number;
        fileEdits: number;
    };
    summary: string;
}
/**
 * DeletionService class
 */
export declare class DeletionService {
    private db;
    private backupManager;
    private storage;
    private semanticSearch;
    constructor(db: Database.Database, storage: ConversationStorage, semanticSearch?: SemanticSearch | null);
    /**
     * Preview what would be deleted for given keywords/topics
     */
    previewDeletionByTopic(keywords: string[], projectPath: string): Promise<DeletionPreview>;
    /**
     * Delete conversations by topic/keywords with automatic backup
     */
    forgetByTopic(keywords: string[], projectPath: string): Promise<DeletionResult>;
    /**
     * Find conversations matching keywords/topics using search
     */
    private findConversationsByTopic;
    /**
     * Count helpers
     */
    private countMessages;
    private countDecisions;
    private countMistakes;
    private countToolUses;
    private countFileEdits;
}
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