key: $wgDBname:messages, $wgDBname:messages-hash, $wgDBname:messages-status
ex: wikidb:messages, wikidb:messages-hash, wikidb:messages-status
stores: an array where the keys are DB keys and the values are messages
- set in: wfMsg(), Article::editUpdates() and Title::moveTo()
+ set in: wfMessage(), Article::editUpdates() and Title::moveTo()
expriy: $wgMsgCacheExpiry
cleared by: nothing