A retail company is building a product recommendation engine. The core data consists of highly connected entities—customers, products, purchases, and 'customers who bought X also bought Y' relationships. Queries must efficiently traverse many-to-many relationships across multiple hops (for example, friends-of-friends purchase patterns) with low latency at global scale. The team wants a fully managed, globally distributed database that supports this traversal model natively. Which Azure data store should you recommend?