import type { AppId, IsoDateTime } from "@vendoai/core";
import type { EngineOps } from "./engine.js";
/** The generic collection the seen rows live in (never a dedicated table). */
export declare const APP_SEEN_COLLECTION = "vendo_app_seen";
/** What one row holds. */
export interface AppSeenRow {
    seenAt: IsoDateTime;
}
export interface AppSeenStore {
    /** Idempotent: the first render wins and every later one costs one refusal. */
    mark(appId: AppId, subject: string): Promise<void>;
    /** Which of `appIds` this person has never had rendered to them. */
    unseen(appIds: readonly AppId[], subject: string): Promise<ReadonlySet<AppId>>;
    /** Drop every person's read state for one app (app-deletion cleanup). */
    clearForApp(appId: AppId): Promise<void>;
}
export declare const appSeenStore: (engine: EngineOps) => AppSeenStore;
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