docs: add tutorial for disabling ID storage

site/main/source/tutorials/disabling-id-storage.md

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+---
+title: Disabling ID Storage
+description: How to disable anonymous ID and user ID storage for privacy compliance
+pageTitle: Disabling ID Storage
+subTitle: Configure analytics to not persist any user identifiers
+---
+
+By default, the analytics library persists anonymous IDs and user IDs to browser storage to maintain user identity across sessions. However, for privacy-sensitive applications or GDPR compliance, you may want to disable all ID storage.
+
+## Using Analytics Core
+
+The simplest way to disable ID storage is to use `@analytics/core` instead of the main `analytics` package. The core library does not include any storage utilities by default.
+
+### Installation
+
+```bash
+npm install @analytics/core
+```
+
+### Basic Setup Without Storage
+
+```js
+import { Analytics, EVENTS, CONSTANTS } from '@analytics/core'
+
+// Initialize analytics without storage
+const analytics = Analytics({
+  app: 'my-app-name',
+  plugins: [
+    // Your analytics plugins here
+  ]
+  // Note: No storage configuration provided
+})
+
+export default analytics
+```
+
+With this setup:
+- No anonymous IDs are persisted between sessions
+- No user IDs are stored in browser storage
+- Each page load generates a new anonymous ID
+- User identification only lasts for the current session
+
+### Comparison: With vs Without Storage
+
+**Standard analytics package (with storage):**
+
+```js
+import Analytics from 'analytics'
+import storage from '@analytics/storage-utils'
+
+// This WILL persist IDs
+const analytics = Analytics({
+  app: 'my-app-name',
+  storage: storage, // IDs stored in localStorage/cookies
+  plugins: [
+    // Your plugins
+  ]
+})
+```
+
+**Analytics core (without storage):**
+
+```js
+import { Analytics } from '@analytics/core'
+
+// This will NOT persist IDs
+const analytics = Analytics({
+  app: 'my-app-name',
+  // No storage configuration - no ID persistence
+  plugins: [
+    // Your plugins
+  ]
+})
+```
+
+## Understanding the Implications
+
+When you disable ID storage:
+
+### ✅ Benefits
+- **Privacy compliant**: No user identifiers stored locally
+- **GDPR friendly**: Reduces personal data processing
+- **Smaller bundle**: Core package is lighter (~12.6kb vs ~13.2kb)
+- **Clean sessions**: Each visit is treated as new
+
+### ⚠️ Considerations
+- **Session continuity**: Users cannot be tracked across browser sessions
+- **Funnel analysis**: Multi-session funnels won't work as expected  
+- **Return visitor tracking**: All visitors appear as new visitors
+- **Cohort analysis**: User retention analysis becomes more difficult
+
+## Custom Storage Configuration
+
+If you need fine-grained control, you can use the main analytics package with custom storage settings:
+
+```js
+import Analytics from 'analytics'
+
+const analytics = Analytics({
+  app: 'my-app-name',
+  // Disable specific storage mechanisms
+  storage: {
+    setItem: () => {}, // No-op function
+    getItem: () => null, // Always return null
+    removeItem: () => {} // No-op function
+  },
+  plugins: [
+    // Your plugins
+  ]
+})
+```
+
+## Plugin Considerations
+
+Some analytics plugins may have their own ID storage mechanisms. When disabling ID storage, verify that your plugins respect these settings:
+
+```js
+import { Analytics } from '@analytics/core'
+import googleAnalytics from '@analytics/google-analytics'
+
+const analytics = Analytics({
+  app: 'my-app-name',
+  plugins: [
+    googleAnalytics({
+      trackingId: 'UA-XXXXXX-X',
+      // Some plugins have their own anonymize settings
+      anonymizeIp: true,
+      // Check plugin docs for privacy-related options
+    })
+  ]
+})
+```
+
+## Testing Your Configuration
+
+To verify that IDs are not being stored:
+
+1. **Check browser storage**: Open Developer Tools → Application → Local Storage/Cookies
+2. **Monitor network requests**: Look for stored IDs in analytics payloads
+3. **Test across sessions**: Refresh the page and verify new anonymous IDs are generated
+
+```js
+// Debug: Log the anonymous ID to verify it changes each session
+console.log('Current anonymous ID:', analytics.user().anonymousId)
+```
+
+## When to Use This Approach
+
+Consider disabling ID storage when:
+
+- Building privacy-first applications
+- Complying with strict data regulations (GDPR, CCPA)
+- Targeting privacy-conscious users
+- Implementing analytics for public/shared devices
+- Reducing data collection to essential metrics only
+
+For most applications, the default storage behavior provides better user experience and more valuable analytics insights. Only disable storage when privacy requirements specifically mandate it.