Remove unused_key function

model.py

@@ -227,18 +227,6 @@ def user_exists(username):
         return False
 
 
-def unused_keys():
-    connect()
-
-    cursor.execute('''
-        SELECT key
-        FROM keys
-        WHERE used_by_user_id IS NULL
-        ''')
-
-    return [str(key[0]).strip().upper() for key in cursor.fetchall()]
-
-
 def get_user_id_by_session_id(session_id):
     connect()
 

server_controller.py

@@ -59,12 +59,12 @@ def register():
     game_key = ''
     if 'game_key' in request.json:
         game_key = request.json['game_key'].strip().upper()
-        if game_key != '' and game_key not in model.unused_keys():
+        if game_key != '' and not model.valid_key(game_key):
             return bad_request('Game key is not valid.')
     if model.register(username, hashed_password, game_key):
         return {'message': "successfully registered user"}
     else:
-        return bad_request('registration not successful')
+        return bad_request('Registration not successful')
 
 
 def activate_key():