A SaaS company delivers a multi-tenant platform for healthcare record management using shared Amazon DynamoDB tables and AWS Lambda functions. Each healthcare provider (tenant) sends a unique provider_id as part of every request. The company wants to implement a tiered pricing model that bills each tenant based on their actual consumption of DynamoDB resources, including both read and write activity. The team already collects AWS Cost and Usage Reports (CUR) in a centralized billing account and wants to use this data to drive tenant-level chargebacks. They are looking for the most accurate, cost-effective, and low-maintenance approach for tracking and allocating DynamoDB usage costs per tenant. Which solution best meets the company's requirements with the least operational effort?