import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Stores the latest acknowledged Rig event position on an active agent's leased agentTurns row when the checkpoint moves forward.
 * Active identity, ownership, and monotonicity checks let an authorized resumed worker continue safely without an older callback rewinding progress.
 */
export declare function agentTurnCheckpoint(executor: DrizzleExecutor, input: {
    agentUserId: string;
    baselineMessageCount: number;
    lastSessionEventId?: string;
    runId?: string;
    userMessageId: string;
    workerId: string;
}): Promise<boolean>;
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