fn find_signal_data(
curr_entity: Entity,
signal_data: &Query<'_, '_, Entity, With<SignalData>>,
children: &Query<'_, '_, &Children>,
) -> Option<Entity>fn find_signal_data(
curr_entity: Entity,
signal_data: &Query<'_, '_, Entity, With<SignalData>>,
children: &Query<'_, '_, &Children>,
) -> Option<Entity>