This is really a defective redesign. It reintroduced numeric IDs to be removed
by T114902. See also T179928. We should reconsider reintroduce a new table to
link unperfixed and perfixed entity ID.
Also oppose any "partial migration for first XXX items" process in T221765:
this makes queries much more complicated. Please first fill all data in the new
schema, then discontinue the old table.
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