public interface IOperationsService
{
    Task<IReadOnlyList<GatewayFleetItem>> GetGatewayFleetAsync(GatewayFleetFilter filter, CancellationToken ct);
    Task<GatewayDetailResponse> GetGatewayDetailAsync(Guid gatewayId, CancellationToken ct);
    Task<SiteGatewaySummaryResponse> GetSiteSummaryAsync(Guid siteId, CancellationToken ct);
}