I don't know your scaling needs, but I would highly recommend just using Aurora postgresql for read-only workloads. We have some workloads that are essentially

I don't know your scaling needs, but I would highly recommend just using Aurora postgresql for read-only workloads. We have some workloads that are essentially K/V store lookups that were previously slated for dynamodb. On an Aurora cluster of 3*r6g.xlarge we easily handle 25k qps with p99 in the single-digit ms range. Aurora can scale up to 15 instances and up to 24xlarge, so it would not be unreasonable to see 100x the read workload with similar latencies. Happy to talk more. We're actively moving a bunch of workloads away from DynamoDB and to Aurora so this is fresh on our minds.