Manual:Page undeletion

Page undeletion (sometimes called page restoration, but for consistency the former is preferred), is done by Special:Undelete or. With both of these methods, the option exists to also undelete all revisions of the associated talk page (if one exists and it has previously been deleted). One or more revisions from the table are moved to the  table and a new page entry, with a new  is created. This entry's field will be set to 1.

Hooks

 * - when one or more revisions of an article are undeleted
 * - called for each undeleted revision