Repeated crashes of 'suggestd'
I turned off Contact's new "Show Contacts Found In Mail" feature (Contacts > Preferences > General > "Show Contacts Found In Mail" or "Show Contacts Found In Apps" in later versions of macOS), and that seems to have shut down suggestd crashes in my log. That also deleted ~/Library/Suggestions/harvestqueueold, which was previously filled by what looked like a bunch of temporary files. I'm going to try turning it back on now and see if the crashes resume.