/**
 * A read-query event. Values are never included — only the **filter shape**
 * (keys + operators) so observers cannot leak PII.
 */
export interface OrmQueryObservation {
    connectionName?: string;
    collection: string;
    /** `find` | `findOne` | `count` | `aggregate` | `distinct` | … */
    op: string;
    /** Keys + operators only, values redacted (e.g. `{ tenantId: '…', createdAt: { $gt: '…' } }`). */
    filterShape: Record<string, unknown>;
    durationMs: number;
    count?: number;
    at: number;
}
export interface QueryObserver {
    onQuery(observation: OrmQueryObservation): void;
}
export declare const registerQueryObserver: (observer: QueryObserver) => (() => void);
export declare const clearQueryObservers: () => void;
export declare const hasQueryObservers: () => boolean;
export declare const notifyQueryObservers: (observation: OrmQueryObservation) => void;
/**
 * Reduces a Mongo filter to its shape: object keys are preserved, operator keys
 * (`$gt`, `$in`, …) are preserved with redacted values, and all scalar/array
 * values collapse to `'…'`. Bounded in depth to avoid pathological documents.
 */
export declare const describeFilterShape: (filter: unknown, depth?: number) => Record<string, unknown>;
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