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Make imports preserve parent revisions like undeletions
Open, Needs TriagePublic


When revisions are imported, we should attempt to preserve the parent revision from the source wiki. This means that if rev_id m has rev_parent_id n or 0 on the source wiki, then rev_id m' would have rev_parent_id n' or 0 on the target wiki, where the primes mean the corresponding imported revision IDs on the target wiki. If the parent ID on the source wiki is a deleted revision ID or has a different rev_page, then we would either have to fallback to using the preceding revision ID as rev_parent_id or insert dummy "ancestor" rows into the archive table.