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‎.changeset/fast-localstorage-mutations.md‎

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‎examples/react/paced-mutations-demo/CHANGELOG.md‎

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# @tanstack/db-example-paced-mutations-demo
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## 0.0.6
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### Patch Changes
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- Updated dependencies [[`75470a8`](https://github.com/TanStack/db/commit/75470a8297f316b4817601b2ea92cb9b21cc7829)]:
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- @tanstack/db@0.4.19
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- @tanstack/react-db@0.1.42
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## 0.0.5
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‎examples/react/paced-mutations-demo/package.json‎

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{
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"name": "@tanstack/db-example-paced-mutations-demo",
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"version": "0.0.5",
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"version": "0.0.6",
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"private": true,
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"type": "module",
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"scripts": {

‎examples/react/todo/CHANGELOG.md‎

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# examples/react/todo
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## 0.1.22
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### Patch Changes
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- Updated dependencies []:
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- @tanstack/electric-db-collection@0.1.43
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- @tanstack/query-db-collection@0.2.42
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- @tanstack/react-db@0.1.42
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- @tanstack/trailbase-db-collection@0.1.41
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## 0.1.21
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‎examples/react/todo/package.json‎

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{
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"name": "@tanstack/db-example-react-todo",
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"private": true,
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"version": "0.1.21",
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"version": "0.1.22",
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"dependencies": {
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"@tanstack/electric-db-collection": "workspace:^",
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"@tanstack/query-core": "^5.90.5",

‎packages/angular-db/CHANGELOG.md‎

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# @tanstack/angular-db
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## 0.1.24
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### Patch Changes
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- Updated dependencies [[`75470a8`](https://github.com/TanStack/db/commit/75470a8297f316b4817601b2ea92cb9b21cc7829)]:
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- @tanstack/db@0.4.19
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## 0.1.23
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‎packages/angular-db/package.json‎

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{
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"name": "@tanstack/angular-db",
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"description": "Angular integration for @tanstack/db",
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"version": "0.1.23",
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"version": "0.1.24",
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"author": "Ethan McDaniel",
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"license": "MIT",
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"repository": {

‎packages/db/CHANGELOG.md‎

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# @tanstack/db
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## 0.4.19
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### Patch Changes
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- Significantly improve localStorage collection performance during rapid mutations ([#760](https://github.com/TanStack/db/pull/760))
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Optimizes localStorage collections to eliminate redundant storage reads, providing dramatic performance improvements for use cases with rapid mutations (e.g., text input with live query rendering).
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**Performance Improvements:**
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- **67% reduction in localStorage I/O operations** - from 3 reads + 1 write per mutation down to just 1 write
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- Eliminated 2 JSON parse operations per mutation
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- Eliminated 1 full collection diff operation per mutation
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- Leverages in-memory cache (`lastKnownData`) instead of reading from storage on every mutation
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**What Changed:**
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1. **Mutation handlers** now use in-memory cache instead of loading from storage before mutations
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2. **Post-mutation sync** eliminated - no longer triggers redundant storage reads after local mutations
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3. **Manual transactions** (`acceptMutations`) optimized to use in-memory cache
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**Before:** Each mutation performed 3 I/O operations:
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- `loadFromStorage()` - read + JSON parse
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- Modify data
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- `saveToStorage()` - JSON stringify + write
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- `processStorageChanges()` - another read + parse + diff
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**After:** Each mutation performs 1 I/O operation:
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- Modify in-memory data ✨ No I/O!
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- `saveToStorage()` - JSON stringify + write
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**Safety:**
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- Cross-tab synchronization still works correctly via storage event listeners
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- All 50 tests pass including 8 new tests specifically for rapid mutations and edge cases
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- 92.3% code coverage on local-storage.ts
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- `lastKnownData` cache kept in sync with storage through initial load, mutations, and cross-tab events
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This optimization is particularly impactful for applications with:
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- Real-time text input with live query rendering
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- Frequent mutations to localStorage-backed collections
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- Multiple rapid sequential mutations
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## 0.4.18
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‎packages/db/package.json‎

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{
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"name": "@tanstack/db",
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"description": "A reactive client store for building super fast apps on sync",
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"version": "0.4.18",
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"version": "0.4.19",
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"dependencies": {
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"@standard-schema/spec": "^1.0.0",
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"@tanstack/db-ivm": "workspace:*",

‎packages/electric-db-collection/CHANGELOG.md‎

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# @tanstack/electric-db-collection
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## 0.1.43
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### Patch Changes
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- Updated dependencies [[`75470a8`](https://github.com/TanStack/db/commit/75470a8297f316b4817601b2ea92cb9b21cc7829)]:
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- @tanstack/db@0.4.19
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## 0.1.42
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### Patch Changes

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