Bug fix: on some system submit_time timestamp lost precision due to being represented in scientific notation. This can cause more than one submission being seen as the same.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7-to-database-extension/trunk@959521 b8457f37-d9ea-0310-8a92-e5e31aec5664
Stable tag: 2.8.6

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7-to-database-extension/trunk@959525 b8457f37-d9ea-0310-8a92-e5e31aec5664