ALTER TABLE `#__content` ADD COLUMN `note` VARCHAR(255) NOT NULL DEFAULT '';

UPDATE `#__content_types` SET `field_mappings` = 
'{"common":{"core_content_item_id":"id","core_title":"title","core_state":"state","core_alias":"alias","core_created_time":"created","core_modified_time":"modified","core_body":"introtext", "core_hits":"hits","core_publish_up":"publish_up","core_publish_down":"publish_down","core_access":"access", "core_params":"attribs", "core_featured":"featured", "core_metadata":"metadata", "core_language":"language", "core_images":"images", "core_urls":"urls", "core_version":"version", "core_ordering":"ordering", "core_metakey":"metakey", "core_metadesc":"metadesc", "core_catid":"catid", "core_xreference":"xreference", "asset_id":"asset_id", "note":"note"}, "special":{"fulltext":"fulltext"}}' WHERE `type_alias` = 'com_content.article';