import type { JournalMeta } from '../vcs/oplog-remote.js';
export declare const CHECKPOINT_RETENTION = 8;
export interface LedgerPushPayload {
    repoId: string;
    previousTail?: string;
    tailHash: string;
    format: string;
    byteLength: number;
    lineCount: number;
    checkpoint: string;
}
export type LedgerPushResult = {
    ok: true;
    meta: JournalMeta;
} | {
    ok: false;
    reason: 'tail-mismatch';
};
export declare function validateJsonl(raw: string): void;
export declare class LedgerStore {
    private readonly dataRoot;
    constructor(dataRoot: string);
    private repoRoot;
    getTail(repoId: string): JournalMeta | null;
    getCheckpoint(repoId: string, tailHash: string): string | null;
    /** Client checkpoint GET has no repoId — scan repos (matches MemoryRemoteSprite). */
    findCheckpointByHash(tailHash: string): string | null;
    push(payload: LedgerPushPayload): LedgerPushResult;
    private trimCheckpoints;
}
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