TanStack DB Overview TanStack DB is a reactive client store built on differential dataflow that extends TanStack Query with collections, live queries, and optimistic mutations. It normalizes data into typed collections, enables sub-millisecond cross-collection queries, and provides instant optimistic updates with automatic rollback on failure. When to use: Reactive UIs needing local-first data, cross-collection joins with live updates, optimistic mutations with automatic sync, real-time sync via ElectricSQL or other backends, apps that outgrow TanStack Query's per-query caching model. When NO…