WP-Sweep finds the rows WordPress leaves behind and removes them. Revisions of posts you edited years ago, meta belonging to a post that was deleted, terms attached to nothing, term relationships pointing at posts that no longer exist, expired transients: none of it is visible anywhere in wp-admin, and all of it is in your database. It uses the proper WordPress delete functions wherever they can reach the row, rather than running raw delete queries, so the hooks other plugins rely on still fire. Only the rows the API refuses to touch — orphaned meta whose object ID is 0 — are deleted directly....
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