/** Exported for unit tests; local `database_query` rejects filters that include these operators. */
export declare const databaseQueryFilterUsesForbiddenOperators: (filter: unknown) => boolean;
export interface DatabaseQueryArgs {
    collection: string;
    operation: string;
    filter?: unknown;
    pipeline?: unknown[];
    field?: string;
    limit?: number;
}
export declare const databaseQuery: (args: DatabaseQueryArgs) => Promise<string>;
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