diff --git a/webservice/models.py b/webservice/models.py
index 79875ad..7cfcb1a 100644
--- a/webservice/models.py
+++ b/webservice/models.py
@@ -13,8 +13,8 @@ class User(db.Model):
 class Transaction(db.Model):
     __tablename__ = 'transactions'
     t_id = db.Column('t_id', db.Integer(), nullable=False, unique=True, primary_key=True)
-    username = db.Column('username', db.Integer(), db.ForeignKey('users.user_id', ondelete='CASCADE'))
-    symbol = db.Column('symbol', db.String(255), unique=True)
+    user_id = db.Column('user_id', db.Integer(), db.ForeignKey('users.user_id', ondelete='CASCADE'))
+    symbol = db.Column('symbol', db.String(255))
     time = db.Column('time', db.DateTime())
     count = db.Column('count', db.Integer())
     price = db.Column('price', db.Float())
@@ -23,12 +23,12 @@ class Transaction(db.Model):
 class Keyword(db.Model):
     __tablename__ = 'keywords'
     s_id = db.Column('s_id', db.Integer(), nullable=False, unique=True, primary_key=True)
-    username = db.Column('username', db.Integer(), db.ForeignKey('users.user_id', ondelete='CASCADE'))
+    user_id = db.Column('user_id', db.Integer(), db.ForeignKey('users.user_id', ondelete='CASCADE'))
     keyword = db.Column('keyword', db.String(255))
 
 
 class Share(db.Model):
     __tablename__ = 'shares'
     a_id = db.Column('a_id', db.Integer(), nullable=False, unique=True, primary_key=True)
-    username = db.Column('username', db.Integer(), db.ForeignKey('users.user_id', ondelete='CASCADE'))
+    user_id = db.Column('user_id', db.Integer(), db.ForeignKey('users.user_id', ondelete='CASCADE'))
     symbol = db.Column('symbol', db.String(255))