/**
 * Error: while inserting or updating, DB unique key was violated,
 * so the Ent was not mutated.
 */
export declare class EntUniqueKeyError extends Error {
    readonly entName: string;
    readonly input: unknown;
    constructor(entName: string, input: unknown);
    /**
     * Returns a promise of T on success, and undefined in case unique key
     * violation happened during the promise resolution.
     */
    static ignore<T>(promise: Promise<T>): Promise<T | undefined>;
}
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