Make dyanamo table read capacity a variable

[BenGalewsky]

Problem

With heavy use, the submissions endpoint is failing with a capacity exception:

[ERROR] ProvisionedThroughputExceededException: An error occurred (ProvisionedThroughputExceededException) when calling the Scan operation (reached max retries: 9): The level of configured provisioned throughput for the table was exceeded. Consider increasing your provisioning level with the UpdateTable API.

Approach

Make this a variable and update it from five to twenty