Chronoform expert required - form / viewer changes req

An RSVP form has been created in chronoform, with a chronoconnectivity element to display the submitted RSVP's. The following changes are required: 1) Don't allow more than 1 rsvp submission per user - form validation with backend data At present, a user can submit an rsvp to another user more than 1 time. The rsvp form needs to have a check to see when a form is submitted, if an rsvp from the user already exists. It will do this by taking the userid or username of the user, and check the rsvp database to see if an entry already exists, if so it will display a message to the user stating e.g: 'sorry you have already submitted an rsvp'. 2) Create an RSVP 'sent history' for users to track the rsvp's that have already been sent. Using chronoconnectivity, rsvp history must be made which displays all the rsvps submitted by the user by querying the rsvp database and filtering only rsvps where username / user id matches the user details of the logged in user. 3) Straight forward, when an rsvp is submitted, on the thank you screen that already shows, a copy of the rsvp details should be shown along with a message - please keep this for your records. The maximum time for the project is 5 days.