import type { DatabaseProvider, QueryFilters } from "./types";
import type { DocumentChunk, SessionMeta, QueryResult, MessageRow, ToolCallRow, AnalyticsFilter, ToolUsageStat, MessageStat, OverviewStats, SessionAnalytics } from "../types";
import type { SessionRow, SessionFilter, ChunkRow } from "../database";
import type { PostgresBackendConfig } from "../config";
export declare class PgDatabaseProvider implements DatabaseProvider {
    readonly backendType: "postgres";
    private pool;
    private dim;
    private config;
    constructor(config: PostgresBackendConfig);
    initialize(): Promise<void>;
    /** Ensure the IVFFlat vector index exists (requires data in the table). */
    /** Ensure the HNSW halfvec vector index exists. */
    ensureVectorIndex(): Promise<void>;
    getSessionMeta(sessionId: string): Promise<SessionMeta | null>;
    upsertSessionMeta(meta: SessionMeta): Promise<void>;
    insertChunks(chunks: DocumentChunk[], embeddings: number[][]): Promise<void>;
    insertMessages(rows: MessageRow[]): Promise<void>;
    insertToolCalls(rows: ToolCallRow[]): Promise<void>;
    deleteToolCallsBySession(sessionId: string): Promise<void>;
    queryByEmbedding(queryEmbedding: number[], topK: number, filters: QueryFilters): Promise<QueryResult[]>;
    queryByKeyword(queryText: string, topK: number, filters: QueryFilters): Promise<QueryResult[]>;
    queryHybrid(queryEmbedding: number[], queryText: string, topK: number, filters: QueryFilters): Promise<QueryResult[]>;
    getChunksByUrl(url: string, startIndex?: number, endIndex?: number): Promise<QueryResult[]>;
    getSessionContext(sessionId: string, chunkId: string, windowSize?: number): Promise<QueryResult[]>;
    listSessionUrls(sessionId: string): Promise<string[]>;
    getSessionChunksOrdered(sessionId: string): Promise<ChunkRow[]>;
    listSessions(filter?: SessionFilter): Promise<SessionRow[]>;
    deleteSession(sessionId: string): Promise<number>;
    deleteSessionsOlderThan(olderThanMs: number): Promise<{
        sessions: number;
        chunks: number;
    }>;
    getToolUsageStats(filter?: AnalyticsFilter): Promise<ToolUsageStat[]>;
    getMessageStats(filter?: AnalyticsFilter): Promise<MessageStat[]>;
    getOverviewStats(filter?: AnalyticsFilter): Promise<OverviewStats>;
    getSessionAnalytics(sessionId: string): Promise<SessionAnalytics | null>;
    checkpoint(): Promise<void>;
    close(): Promise<void>;
    private toSessionMeta;
    private toQueryResult;
}
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