AWS comes into its own for these kinds of use cases - make a lightweight autoscaling events API on Elastic Beanstalk pumping events into DynamoDB coupled with a

AWS comes into its own for these kinds of use cases - make a lightweight autoscaling events API on Elastic Beanstalk pumping events into DynamoDB coupled with a bunch of workers running at the EC2 spot price sorting and processing these into a traditional RDBMS = massively horizontally scalable events handling for pennies an hour.