mozilla-services/android-sync — comment on commit f40bf4ac446b1da2610bc467907639247975b346
File:  line 0
By rnewman:

This is a minor rework of the existing store code that fixes a bug: we previously would always delete the existing record, then re-insert if necessary. Not only is that wasteful, but the existing record wasn't completely populated! This would lose history visits.