diff --git a/files/classes/award.py b/files/classes/award.py
index b5c9fa181..3025fa7c6 100644
--- a/files/classes/award.py
+++ b/files/classes/award.py
@@ -61,8 +61,8 @@ class AwardRelationship(Base):
 	id = Column(Integer, primary_key=True)
 
 	user_id = Column(Integer, ForeignKey("users.id"))
-	submission_id = Column(Integer, ForeignKey("submissions.id"), default=None)
-	comment_id = Column(Integer, ForeignKey("comments.id"), default=None)
+	submission_id = Column(Integer, ForeignKey("submissions.id"))
+	comment_id = Column(Integer, ForeignKey("comments.id"))
 	kind = Column(String(20))
 
 	user = relationship("User", primaryjoin="AwardRelationship.user_id==User.id", viewonly=True)
diff --git a/files/classes/comment.py b/files/classes/comment.py
index ccacfba99..bd0d82892 100644
--- a/files/classes/comment.py
+++ b/files/classes/comment.py
@@ -18,7 +18,7 @@ class CommentAux(Base):
 
 	key_id = Column(Integer, primary_key=True)
 	id = Column(Integer, ForeignKey("comments.id"))
-	body = Column(String(10000), default=None)
+	body = Column(String(10000))
 	body_html = Column(String(20000))
 	ban_reason = Column(String(256), default='')
 
diff --git a/files/classes/mod_logs.py b/files/classes/mod_logs.py
index d14b6ef8a..aae7b15a2 100644
--- a/files/classes/mod_logs.py
+++ b/files/classes/mod_logs.py
@@ -13,7 +13,7 @@ class ModAction(Base):
 	target_user_id = Column(Integer, ForeignKey("users.id"), default=0)
 	target_submission_id = Column(Integer, ForeignKey("submissions.id"), default=0)
 	target_comment_id = Column(Integer, ForeignKey("comments.id"), default=0)
-	_note=Column(String(256), default=None)
+	_note=Column(String(256))
 	created_utc = Column(Integer, default=0)
 
 	user = relationship("User", primaryjoin="User.id==ModAction.user_id", viewonly=True)