* and removed in front end

Id was replaced by a composite primary key

#77 create Table for Peer2PeerFeedback
#78 db communication (create new entry)
#79 implement createPeer2PeerFeedback
#80 adjust view for student (givefeedback)

feat: workRating for peers are written to DB
feat: 2 new tables in DB

feat: db reworked for quizzes.