Manual:Merging histories

Merging page histories is done using Special:MergeHistory. This lets the user merge revisions of the history of one source page into a newer page. The user can use the radio button column to merge in only the revisions created at and before the specified time. Special:Logs/merge will then present the user with an "Unmerge" button to reverse the merge. This is done by switching the source and destination pages in Special:MergeHistory.

Merging pages works by changing the field in the  table. When you merge two pages, the source page must generally be older than the destination page, because Special:MergeHistory will only allow revisions to be prepended to a page's history—mixing histories would not make sense. When merging, the selected revisions from the source page will be set as revisions of the destination page.

Database
holds the page title of the destination page and the timestamp.

API
A sample API results: