/**
 * Shared cross-project types for knowledge, crm, projects, and machines.
 *
 * Each project vendors this file. Keep it small — add fields only when all three
 * projects need them.
 */
export type ProjectName = "knowledge" | "crm" | "projects" | "machines";
/**
 * A reference from a record in one project to a record in another.
 * Stored in `metadata._crossRefs` on the owning entity.
 */
export interface CrossRef {
    source_project: ProjectName;
    source_id: string;
    target_project: ProjectName;
    target_id: string;
    /** Optional human description of the relationship. */
    label?: string;
    /** Agent or user that created this reference. */
    created_by?: string;
    /** ISO timestamp of creation. */
    created_at?: string;
}
/** Reserved key inside `metadata` for cross-project references. */
export declare const CROSSREFS_KEY: "_crossRefs";