add create contest problem

contest/models.py

@@ -3,7 +3,6 @@ from django.utils.timezone import now
 from jsonfield import JSONField
 
 from account.models import User
-from problem.models import AbstractProblem
 from utils.models import RichTextField
 
 
@@ -61,17 +60,6 @@ class Contest(models.Model):
         db_table = "contest"
 
 
-class ContestProblem(AbstractProblem):
-    _id = models.CharField(max_length=24, db_index=True)
-    contest = models.ForeignKey(Contest)
-    # 是否已经公开了题目，防止重复公开
-    is_public = models.BooleanField(default=False)
-
-    class Meta:
-        db_table = "contest_problem"
-        unique_together = (("_id", "contest"), )
-
-
 class ContestRank(models.Model):
     user = models.ForeignKey(User)
     contest = models.ForeignKey(Contest)