Fix #274

@squirrelo's point is that adding a row to the test database with a timestamp of ```now()``` (rather than some particular arbitrary time) makes it of limited value for testing, because if you instantiate ```Analysis(1)``` in a test, you have no way of knowing exactly what that timestamp will be.  Of course, creating a new analysis (as you demonstrated in your snippet above) will have a predictable time, but that is not related to @squirrelo's concern here.  I agree that it should be changed to some particular time.