A gaming company runs a multiplayer platform that must store player session state, such as current score, position, and inventory. The application requires single-digit millisecond read and write latency at any scale, and access is always by a known player ID. Traffic is highly unpredictable, spiking during tournaments to millions of requests per second. The data engineering team wants a fully managed data store that automatically scales without capacity planning and minimizes operational overhead. Which AWS data store best meets these requirements?