For merging entities, we will need a system in place to redirect IDs to another ID, in the same way MusicBrainz does it for merged entities.

The table could then also be used to redirect BBIDs to MBIDs for creators that already exist on MB.

For example, redirect https://bookbrainz.org/creator/ac59097e-7f86-436d-9308-f6e63871ceff to https://musicbrainz.org/artist/8047a401-5ca7-48dd-9d7c-2d2b822e51e6