From a supplier we are getting inventory which is of one time use only. Supplier will provide the inventory only on request, and we do not wish to see the inventory is exhausted. Also we wanted to make sure each bach gets finished in the sequence of applying the same. When we were in MySQL / MariaDB this would have been just another table sorted on primary key and a flag status = ENUM(“new”,”used”). But we are in the “serverless” hype and on AWS with DynamoDB.