export interface ConsumerSyncRecord {
    lastSyncAt: number;
    firstSyncAt: number;
    syncCount: number;
}
export interface CxfSyncState {
    consumers: Record<string, ConsumerSyncRecord>;
}
export declare function loadSyncState(): Promise<CxfSyncState>;
export declare function saveSyncState(state: CxfSyncState): Promise<void>;
/** Records a successful sync for a consumer. Returns the Unix seconds timestamp used. */
export declare function recordSync(consumerId: string): Promise<number>;
export declare function getLastSync(consumerId: string): Promise<number | null>;
export declare function getAllConsumers(): Promise<Record<string, ConsumerSyncRecord>>;
/**
 * Returns true if any registered consumer has NOT synced since deletedAtUnix.
 * Used to determine whether to keep emitting a tombstone.
 */
export declare function shouldIncludeTombstone(deletedAtUnix: number): Promise<boolean>;
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