read one is the wrong method when trying to select one row when there
are multiple. It returns TooManyRows error. Read first is the correct
method.
Change-Id: Ic6c92795486892ac041befd118b6945314bffeaa
Implement node events DB with Insert and GetLatestByEmailAndEvent. Get
was changed to GetLatestByEmailAndEvent so we can verify items are being
inserted into the table without needing the ID, which is not available
to us in the tests.
Change-Id: I4abe63631c44774cd7e795fbab0cbab4d801db4c
