import type { DurableSegment, SegmentDurability, SegmentDurabilityPutResult } from "../chunk-uploader/segment-uploader.js";
export declare const REPLAY_CHUNK_DB_PREFIX = "proctoring-replay";
export interface ReplayChunkStoreOptions {
    sessionId: string;
    maxBytes?: number;
}
export declare function replayChunkDbName(sessionId: string): string;
/**
 * Durable, byte-capped replay queue. The newest independently playable
 * window is always retained; oldest unacknowledged windows are evicted first
 * when the origin is offline long enough to reach the disk budget.
 */
export declare class ReplayChunkStore implements SegmentDurability {
    private readonly dbName;
    private readonly maxBytes;
    private db;
    constructor(options: ReplayChunkStoreOptions);
    name(): string;
    open(): Promise<void>;
    list(): Promise<DurableSegment[]>;
    listSequences(): Promise<number[]>;
    get(sequence: number): Promise<DurableSegment | null>;
    put(record: DurableSegment): Promise<SegmentDurabilityPutResult>;
    remove(sequence: number): Promise<void>;
    nextSequence(preferred: number): Promise<number>;
    bytes(): Promise<number>;
    close(): Promise<void>;
    private requireDb;
}
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