UPDATE `#__content_types` 
set
  `field_mappings` = '{"common":{"core_content_item_id":"id","core_title":"description","core_state":"published","core_alias":"null","core_created_time":"created_time","core_modified_time":"modified_time","core_body":"text", "core_hits":"hits","core_publish_up":"null","core_publish_down":"null","core_access":"access", "core_params":"params", "core_featured":"null", "core_metadata":"metadata", "core_language":"null", "core_images":"null", "core_urls":"null", "core_version":"version", "core_ordering":"null", "core_metakey":"metakey", "core_metadesc":"metadesc", "core_catid":"catid", "core_xreference":"null", "asset_id":"asset_id"}, "special": {"parent_id":"parent_id","lft":"lft","rgt":"rgt","level":"level","path":"path","extension":"extension","note":"note"}}'
WHERE 
	type_alias='com_eventgallery.event';