I guess I thought this plugin would delete all usused custom fields, as in blanks.
But its setting page says:
Delete all custom fields from non-existing posts
Warning: clicking "Delete" would remove all post meta for the post IDs below permanently from the database!
Post IDs found in the table without corresponding posts in wp_posts:
Press the "Delete" button if you want to remove all postmeta for these post IDs.
So I guess that's a good cleanup task to do too.
Thanks for the free plugin!
This is exactly what I was looking for! It worked pretty good for what I needed.
One improvement I would suggest is to find a way to deal with massive amounts of unused post meta. I had about 100,000 rows of unused post meta, and it wouldn't work. I deleted a bunch I knew for sure I didn't need, got it under 20,000 and it worked fine.
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