KNL-1072 specify a default for the TIMESTAMP column

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@124095 66ffb92e-73f9-0310-93c1-f5514f145a0a
KNL-1072 specify a default for the TIMESTAMP column

git-svn-id: https://source.sakaiproject.org/svn/kernel/trunk@124096 66ffb92e-73f9-0310-93c1-f5514f145a0a