Align client with batch, cache, error, and view-storage specs from PR #380

packages/client/README.md

@@ -6,7 +6,11 @@ The official TypeScript client for ObjectStack.
 
 - **Auto-Discovery**: Connects to your ObjectStack server and automatically configures API endpoints.
 - **Typed Metadata**: Retrieve Object and View definitions with full type support.
+- **Metadata Caching**: ETag-based conditional requests for efficient metadata caching.
 - **Unified Data Access**: Simple CRUD operations for any object in your schema.
+- **Batch Operations**: Efficient bulk create/update/delete with transaction support.
+- **View Storage**: Save, load, and share custom UI view configurations.
+- **Standardized Errors**: Machine-readable error codes with retry guidance.
 
 ## Installation
 
@@ -47,8 +51,48 @@ async function main() {
     priority: 1
   });
 
-  // 6. Batch Operations
-  await client.data.deleteMany('todo_task', ['id1', 'id2']);
+  // 6. Batch Operations (New!)
+  const batchResult = await client.data.batch('todo_task', {
+    operation: 'update',
+    records: [
+      { id: '1', data: { status: 'active' } },
+      { id: '2', data: { status: 'active' } }
+    ],
+    options: {
+      atomic: true,        // Rollback on any failure
+      returnRecords: true  // Include full records in response
+    }
+  });
+  console.log(`Updated ${batchResult.succeeded} records`);
+
+  // 7. Metadata Caching (New!)
+  const cachedObject = await client.meta.getCached('todo_task', {
+    ifNoneMatch: '"686897696a7c876b7e"'  // ETag from previous request
+  });
+  if (cachedObject.notModified) {
+    console.log('Using cached metadata');
+  }
+
+  // 8. View Storage (New!)
+  const view = await client.views.create({
+    name: 'active_tasks',
+    label: 'Active Tasks',
+    object: 'todo_task',
+    type: 'list',
+    visibility: 'public',
+    query: {
+      object: 'todo_task',
+      where: { status: 'active' },
+      orderBy: [{ field: 'priority', order: 'desc' }],
+      limit: 50
+    },
+    layout: {
+      columns: [
+        { field: 'subject', label: 'Task', width: 200 },
+        { field: 'priority', label: 'Priority', width: 100 }
+      ]
+    }
+  });
 }
 ```
 
@@ -59,18 +103,29 @@ Initializes the client by fetching the system discovery manifest from `/api/v1`.
 
 ### `client.meta`
 - `getObject(name: string)`: Get object schema.
+- `getCached(name: string, options?)`: Get object schema with ETag-based caching.
 - `getView(name: string)`: Get view configuration.
 
 ### `client.data`
 - `find<T>(object, options)`: Advanced query with filtering, sorting, selection.
 - `get<T>(object, id)`: Get single record by ID.
 - `query<T>(object, ast)`: Execute complex query using full AST.
 - `create<T>(object, data)`: Create record.
-- `createMany<T>(object, data[])`: Batch create records.
+- `batch(object, request)`: **Recommended** - Execute batch operations (create/update/upsert/delete) with full control.
+- `createMany<T>(object, data[])`: Batch create records (convenience method).
 - `update<T>(object, id, data)`: Update record.
-- `updateMany<T>(object, ids[], data)`: Batch update records.
+- `updateMany<T>(object, records[], options?)`: Batch update records (convenience method).
 - `delete(object, id)`: Delete record.
-- `deleteMany(object, ids[])`: Batch delete records.
+- `deleteMany(object, ids[], options?)`: Batch delete records (convenience method).
+
+### `client.views` (New!)
+- `create(request)`: Create a new saved view.
+- `get(id)`: Get a saved view by ID.
+- `list(request?)`: List saved views with optional filters.
+- `update(request)`: Update an existing view.
+- `delete(id)`: Delete a saved view.
+- `share(id, userIds[])`: Share a view with users/teams.
+- `setDefault(id, object)`: Set a view as default for an object.
 
 ### Query Options
 The `find` method accepts an options object:
@@ -80,3 +135,32 @@ The `find` method accepts an options object:
 - `top`: Limit number of records.
 - `skip`: Offset for pagination.
 
+### Batch Options
+Batch operations support the following options:
+- `atomic`: If true, rollback entire batch on any failure (default: true).
+- `returnRecords`: If true, return full record data in response (default: false).
+- `continueOnError`: If true (and atomic=false), continue processing remaining records after errors.
+- `validateOnly`: If true, validate records without persisting changes (dry-run mode).
+
+### Error Handling
+The client provides standardized error handling with machine-readable error codes:
+
+```typescript
+try {
+  await client.data.create('todo_task', { subject: '' });
+} catch (error) {
+  console.error('Error code:', error.code);        // e.g., 'validation_error'
+  console.error('Category:', error.category);      // e.g., 'validation'
+  console.error('HTTP status:', error.httpStatus); // e.g., 400
+  console.error('Retryable:', error.retryable);    // e.g., false
+  console.error('Details:', error.details);        // Additional error info
+}
+```
+
+Common error codes:
+- `validation_error`: Input validation failed
+- `unauthenticated`: Authentication required
+- `permission_denied`: Insufficient permissions
+- `resource_not_found`: Resource does not exist
+- `rate_limit_exceeded`: Too many requests
+