import type { EngineOps } from "./engine.js";
/** The generic collection the LIVE rows live in (never a dedicated table).
 *  Exactly one row per live placement, which is what the seam readers count. */
export declare const PLACEMENTS_COLLECTION = "vendo_placements";
/** The pointers, in their own generic collection so the live count above stays
 *  the live count. Neither reserved nor dedicated, so it routes to the same
 *  `vendo_records` table — no migration, and the erase cascade still sweeps it
 *  on `refs.subject`. */
export declare const PLACEMENT_SLOTS_COLLECTION = "vendo_placement_slots";
export interface PlacementRow {
    slot: string;
    appId: string;
    placedBy: string;
    placedAt: string;
}
export interface PlacementStore {
    get(subject: string, slot: string): Promise<PlacementRow | undefined>;
    put(subject: string, row: PlacementRow): Promise<void>;
    /** Take the slot and report what held it, as ONE decision. */
    place(subject: string, row: PlacementRow): Promise<PlacementRow | undefined>;
    /** Clear the slot only while `appId` still holds it. */
    delete(subject: string, slot: string, appId: string): Promise<void>;
    /** Clear every placement of one app, whoever holds it (app-deletion cleanup). */
    clearForApp(appId: string): Promise<void>;
    list(subject: string, slots?: readonly string[]): Promise<PlacementRow[]>;
}
export declare function placementStore(engine: EngineOps): PlacementStore;
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