```ts

/**
 * An append-only log of timestamped events.
 */
export class EventLog {
  #events: Event[] = [];

  /**
   * Append one event.
   * @param {Event} event - The event to record.
   */
  record(event: Event): void {
    this.#events.push(event);
  }

  /**
   * Every event at or after the given timestamp, in insertion order.
   * @param {number} timestamp - The timestamp to filter events by.
   * @returns {Event[]} All events at or after the given timestamp.
   */
  since(timestamp: number): Event[] {
    return this.#events.filter((event) => event.timestamp >= timestamp);
  }
}

// Export the interface for type reference
export interface Event { name: string; timestamp: number }
```