export class LimitReachedError extends Error { constructor(message: string) { super(message); this.name = "LimitReachedError"; } } export class ConcurrentModificationError extends Error { constructor(message: string) { super(message); this.name = "ConcurrentModificationError"; } } export class DuplicateEntryError extends Error { constructor(message: string) { super(message); this.name = "DuplicateEntryError"; } }