{"push_id":1068252495,"size":1,"distinct_size":1,"ref":"refs/heads/master","head":"0cd407baa84a3b919b622f24c5d2b501eceb2703","before":"6bf0dc4f6aff393c8f2ca8ea71ccdcecb08896dc","commits":[{"sha":"0cd407baa84a3b919b622f24c5d2b501eceb2703","author":{"email":"4872e7367885c9211a35fc4fa7f7423583a8b72d@gmail.com","name":"Dmytro Rybalko"},"message":"add constrain: student can have one grade for the quiz","distinct":true,"url":"https://api.github.com/repos/DmytroRybalko/studentsdb/commits/0cd407baa84a3b919b622f24c5d2b501eceb2703"}]}