How can get submit_time after data saved to the database

That would be very nice to have, but I don’t have a way to accomplish that. The problem is that you have a form plugin (like Contact Form 7) that controls what happens on the browser when a form is submitted, and my CFDB plugin is listening a CF7’s hook to grab the data and save it. But here is no hook into CF7 for CFDB to tell it to do something different like redirect to a specific URL.