Hi Tom,
We do not recommend to edit database records as it may cause undesired results. Wish to check if you have looked at API options available in SDP. SDP support REST API, Servlet API to deal with Request (and Notes). We request to look at Admin -> API or on line help documentation at : http://www.manageengine.com/products/service-desk/help/adminguide/api/api.html
regards,
Uma..
SDP team.