Fix using nonexistent variable

app/services/user_service.py

@@ -85,7 +85,7 @@ class UserService:
 			with db_connection.cursor(dictionary=True) as cursor:
 
 				cursor.execute("select id, password from user where username = %s", (username,))
-				result = db_cursor.fetchone()
+				result = cursor.fetchone()
 
 				user_id = result['id']
 				password_hash = result['password']