View file PF.Base/module/core/install/version/3.1.0beta1.xml.php

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<upgrade>
	<settings>
		<setting>
			<group>cdn_content_delivery_network</group>
			<module_id>core</module_id>
			<is_hidden>0</is_hidden>
			<type>string</type>
			<var_name>cdn_service</var_name>
			<phrase_var_name>setting_cdn_service</phrase_var_name>
			<ordering>8</ordering>
			<version_id>3.1.0beta1</version_id>
			<value />
		</setting>
	</settings>
</upgrade>