server/src/services/tripAccess.ts

import { canAccessTrip } from '../db/database';

/**
 * Returns the trip row if the user is the owner or a member, otherwise undefined.
 * Shared by the domain services so each one exposes the same access check.
 */
export function verifyTripAccess(tripId: string | number, userId: number) {
  return canAccessTrip(tripId, userId);
}