diff --git a/ayct_backend/__init__.py b/ayct_backend/__init__.py
index 0775ac3..0145152 100644
--- a/ayct_backend/__init__.py
+++ b/ayct_backend/__init__.py
@@ -20,7 +20,9 @@ def create_app():
     twitter_db.init_app(app)
     campaign_db.init_app(app)
 
+    twitter_db.drop_all(app=app)
     twitter_db.create_all(app=app)
+    campaign_db.drop_all(app=app)
     campaign_db.create_all(app=app)
 
     app.register_blueprint(twitter, url_prefix='/twitter')
diff --git a/ayct_backend/twitter/models.py b/ayct_backend/twitter/models.py
index ef86f7f..e35e1d3 100644
--- a/ayct_backend/twitter/models.py
+++ b/ayct_backend/twitter/models.py
@@ -8,7 +8,7 @@ class TwitterAccount(twitter_db.Model):
 
     account_id = twitter_db.Column(twitter_db.Integer, primary_key=True)
     user_id = twitter_db.Column(twitter_db.String(64), nullable=False)
-    twitter_account_id = twitter_db.Column(twitter_db.String(32), unique=True, nullable=False)
-    username = twitter_db.Column(twitter_db.String(16), unique=True, nullable=False)
+    twitter_account_id = twitter_db.Column(twitter_db.String(32), nullable=False)
+    username = twitter_db.Column(twitter_db.String(16), nullable=False)
     access_token = twitter_db.Column(twitter_db.String(256), nullable=False)
     access_token_secret = twitter_db.Column(twitter_db.String(256), nullable=False)