tanstack-db

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 NOT to use: Simple fetch-and-display (TanStack Query alone suffices), server-components-only apps, purely synchronous local state (useState/Zustand), GraphQL with normalized caching (Apollo/urql).

TanStack DB 反應式客戶端資料庫，具有即時查詢和樂觀突變。使用本機優先資料、同步引擎或樂觀更新建立反應式 UI 時使用。用於 tanstack-db、即時查詢、樂觀突變、同步引擎、反應式資料庫、本地優先。 來源：oakoss/agent-skills。