add offsync doc

Author: andinux

sqlite-cloud/_nav.ts

@@ -83,6 +83,7 @@ const sidebarNav: SidebarNavStruct = [
     type: "inner",
     level: 0,
   },
+  { title: "Offsync", filePath: "offsync", type: "inner", level: 0 },
   {
     title: "Access Tokens",
     filePath: "access-tokens",

sqlite-cloud/platform/offsync.mdx

@@ -0,0 +1,42 @@
+---
+title: Offsync
+description: Enable local-first applications with automatic data synchronization between edge devices and SQLite Cloud.
+category: platform
+status: publish
+slug: offsync
+---
+
+import Callout from "@commons-components/Information/Callout.astro";
+
+Offsync is a powerful SQLite Cloud feature that enables true **local-first** data synchronization for your applications. Powered by the [SQLite Sync](https://github.com/sqliteai/sqlite-sync) extension, it allows you to build robust, offline-capable applications where data is stored and processed on edge devices and seamlessly synchronized with a central SQLite Cloud database.
+
+This architecture is ideal for mobile apps, IoT devices, and any application requiring high availability and low latency, even with intermittent network connectivity. By leveraging Conflict-free Replicated Data Types (CRDTs), Offsync ensures that changes made offline are merged automatically and without conflicts when the device reconnects.
+
+## How It Works
+
+Offsync extends standard SQLite tables with built-in support for offline work and automatic synchronization. This allows multiple devices to operate independently and then seamlessly merge their changes.
+
+- **Offline-First by Design**: Applications work seamlessly even when devices are offline. Changes are queued locally and synced automatically when connectivity is restored.
+- **CRDT-Based Conflict Resolution**: Merges updates deterministically and efficiently, ensuring eventual consistency across all replicas without complex merge logic.
+- **Seamless Integration**: The sync layer is tightly integrated with SQLite Cloud, enabling secure data sharing across devices, users, and platforms.
+
+When combined with [Row-Level Security (RLS)](/docs/sqlite-cloud/platform/rls), Offsync allows you to build secure, multi-tenant applications where each user's data is safely isolated, both on the edge and in the cloud.
+
+## Configuring Offsync
+
+You can enable and manage Offsync for your databases directly from the SQLite Cloud dashboard.
+
+1.  **Navigate to the Databases Page**: From the main dashboard, go to the "Databases" page.
+2.  **Select the Offsync Column**: In the list of your databases, click on the button in the "Offsync" column for the desired database.
+
+    ![Dashboard Databases Page](@docs-website-assets/introduction/offsync-1.png)
+
+3.  **Enable Tables for Synchronization**: On the Offsync settings page, you will see a list of all tables in your database. Toggle the switch next to each table you want to enable for synchronization.
+
+    ![Dashboard Offsync Settings Page](@docs-website-assets/introduction/offsync-2.png)
+
+<Callout type="note" title="Matching Schemas and Tables">
+For Offsync to work correctly, the list of tables configured for synchronization—and their corresponding schemas—must be identical in both your local SQLite database and your SQLite Cloud database.
+</Callout>
+
+Once enabled, any changes made to the selected tables via the SQLite Sync extension will be automatically synchronized with your SQLite Cloud database.