Google Chrome is starting to auto-delete old history entries - what the hell?

It just deleted everything before 5 months ago. Ugh

The old versions always archived up the history index files like “History Index 2011-09”.

But now “History Index 2011-09” has a very small file size - meaning that it deleted practically everything - as I can now see when I use the Chrome Extension History Calendar.

Alternatively, couldn’t History Calendar be deleting my old history entries?

http://www.chromeplugins.org/google/chrome-talk/chrome-how-make-history-records-infinite-never-delete-old-history-16374.html expresses the same concern

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Is there any way for me to prevent it from deleting everything now?