Act as a Senior Solutions Architect. Design a microservices architecture for a high-traffic e-commerce platform capable of handling 100,000 concurrent users during flash sales. Your design must address service discovery, load balancing, data consistency patterns (eventual vs. strong), inter-service communication (gRPC vs. REST), and fault tolerance mechanisms such as circuit breakers and bulkheads. Provide a detailed explanation of your choice of database per service pattern and how you intend to handle distributed transactions.