/**
 * Multi-tenant quota enforcement for logosdb-mcp-server.
 *
 * All checks are O(1) counter reads — zero hot-path overhead when quotas are
 * not configured (the default).
 *
 * Environment variables:
 *   LOGOSDB_QUOTA_MAX_VECTORS     Max live vectors per namespace   (0 = unlimited, default 0)
 *   LOGOSDB_QUOTA_MAX_NAMESPACES  Max namespaces under DB root     (0 = unlimited, default 0)
 */
export interface QuotaConfig {
    /** Maximum live vectors per namespace. 0 = unlimited. */
    maxVectorsPerNs: number;
    /** Maximum distinct namespaces under the DB root. 0 = unlimited. */
    maxNamespaces: number;
}
export declare function loadQuotaConfig(): QuotaConfig;
/**
 * Throw if inserting `adding` vectors into `namespace` would exceed the
 * per-namespace vector limit.  No-op when the limit is 0 (unlimited).
 *
 * Pass `db.countLive()` as `currentLive` — the call is O(1).
 */
export declare function checkVectorQuota(currentLive: number, adding: number, namespace: string, cfg: QuotaConfig): void;
/**
 * Throw if creating `newNs` as a brand-new namespace would exceed the
 * namespace-count limit.  No-op when the limit is 0, or when `newNs` is
 * already present in `existingNs` (opening an existing ns is always allowed).
 */
export declare function checkNsQuota(existingNs: string[], newNs: string, cfg: QuotaConfig): void;
export declare class QuotaExceededError extends Error {
    readonly kind: 'vectors' | 'namespaces';
    readonly namespace: string;
    constructor(message: string, kind: 'vectors' | 'namespaces', namespace: string);
}
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