I'm working on a database with about 600,000 records, of which approximately 200,000 are believed to be duplicates.
Has anyone got experience/advice for doing dedupe at scale? I imagine that we'll need to export and do some sort of external dedupe. Has anyone successfully used the datamade dedupe with Civi? I know that the "merge" API got some love a couple months ago - will any of that help me?