makeoverview is a very raw and incomplete re-implementation of
inn/expire/makehistory.c tool which is supplied within INN
distribution.

This tool works only with INN versions 2.* but up to INN 2.2.2.

Unlike makehistory (which is like a Swiss army knife), makeoverview tool
does only one thing -- it re-builds INN databases from news articles.

makeoverview reads articles (by scanning the news spool and/or reading history
entries) and builds new history, uniover databases as well as
source file for expireindex tool which, in turn, makes overview
index database.

You need to pause innd before starting makeoverview tool. After makeoverview
finishes, you need to replace regular history files and uniover directory
with their '.n' suffixed counterparts, then run expireindex against
sorted tmp/overview.index file, then resume innd. All your INN
databases should get consistent at this point.

This tool is not well tested. Use it at your own risk.