import type { DatabaseSync } from "node:sqlite";
import type { CreateSessionInput, SessionDbRecord } from "./databaseTypes.js";
/**
 * Sessions repository backed by SQLite without caching.
 * Expects: schema migrations already applied for sessions.
 */
export declare class SessionsRepository {
    private readonly db;
    constructor(db: DatabaseSync);
    findById(id: string): Promise<SessionDbRecord | null>;
    findByAgentId(agentId: string): Promise<SessionDbRecord[]>;
    create(input: CreateSessionInput): Promise<string>;
    /**
     * Marks a session as ended by setting ended_at.
     * Expects: sessionId is valid.
     */
    endSession(sessionId: string, endedAt: number): Promise<void>;
    /**
     * Marks a session as needing memory processing.
     * Sets invalidated_at only if null or if historyId is larger.
     * Expects: sessionId and historyId are valid.
     */
    invalidate(sessionId: string, historyId: number): Promise<void>;
    /**
     * Returns sessions that need memory processing, ordered by invalidated_at ASC.
     * Expects: limit > 0.
     */
    findInvalidated(limit: number): Promise<SessionDbRecord[]>;
    /**
     * CAS update: clears invalidated_at and sets processed_until,
     * but only if invalidated_at still matches the expected value.
     * Returns true if the update was applied.
     */
    markProcessed(sessionId: string, processedUntil: number, expectedInvalidatedAt: number): Promise<boolean>;
    private sessionParse;
}
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