SQLite Storage User Guide

Welcome to the SQLite Storage feature for CB Pro Proxy! This guide will help you understand, enable, and use the new high-performance storage system.

What is SQLite Storage?
Benefits
When to Use SQLite Storage
How to Enable SQLite Storage
Understanding the Migration Process
How to Verify It's Working
How to Disable and Rollback
Performance Expectations
FAQ
Known Limitations
Troubleshooting

What is SQLite Storage?

SQLite Storage is a new, high-performance storage backend for CB Pro Proxy that replaces the traditional AsyncStorage system. It uses a local SQLite database to store your proxy profiles, providing significantly faster operations, especially when managing large numbers of profiles.

Key Features

🚀 15-40x Faster Bulk Operations - Delete hundreds of profiles in seconds instead of minutes
📊 Efficient Data Management - Optimized queries and indexing for quick access
🔄 Automatic Migration - Seamlessly migrates your existing profiles
🔒 Secure Credentials - Passwords remain encrypted in SecureStore
🔁 Native Sync - Automatic synchronization with Android native module
↩️ Rollback Support - Safe migration with automatic rollback on failure

Benefits

Performance Improvements

SQLite Storage delivers dramatic performance improvements over AsyncStorage:

Operation	Profile Count	AsyncStorage	SQLite	Improvement
Bulk Delete	100	~10 seconds	~0.5 seconds	20x faster
Bulk Delete	500	~50 seconds	~2 seconds	25x faster
Bulk Delete	1000	~100 seconds	~3.5 seconds	28x faster
Load Profiles	500	~2-3 seconds	~0.5-1 second	2-3x faster
Bulk Create	100	~10 seconds	~1 second	10x faster

Additional Benefits

Better Scalability - Handle thousands of profiles without performance degradation
Reliable Transactions - All-or-nothing operations prevent data corruption
Advanced Queries - Fast searching and filtering by name, host, tags, or type
Data Integrity - Foreign key constraints ensure consistent relationships
Efficient Storage - Optimized database structure reduces storage footprint

When to Use SQLite Storage

✅ You Should Enable SQLite If:

You manage 50+ proxy profiles
You frequently bulk delete profiles
You need fast profile loading times
You want better performance overall
You're comfortable with new features

⚠️ Consider Staying with AsyncStorage If:

You have fewer than 20 profiles
You prefer proven stability over performance
You're experiencing device storage issues
You need to troubleshoot existing problems first

Recommendation: For most users with 50+ profiles, SQLite Storage provides significant benefits with minimal risk.

How to Enable SQLite Storage

Step-by-Step Instructions

Option 1: Via Settings Screen (Recommended)

Open the App
- Launch CB Pro Proxy on your device
Navigate to Settings
- Tap the Settings icon (⚙️) in the navigation bar
Find Storage Settings
- Scroll to the "Storage" section
- Look for "Use SQLite Storage" option
Enable SQLite
- Toggle the "Use SQLite Storage" switch to ON
- A confirmation dialog will appear
Confirm Migration
- Read the migration information
- Tap "Enable and Migrate" to proceed
- Note: This process is automatic and safe
Wait for Migration
- A progress indicator will show migration status
- Do not close the app during migration
- Migration typically takes 15-30 seconds for 500 profiles
Verify Success
- You'll see a success message when complete
- Your profiles will load normally
- Performance improvements are immediate

Option 2: Via ADB (Advanced Users)

For automation or remote management:

# Enable SQLite storage via ADB
adb shell am broadcast -n com.cbv.vpn/.VPNIntentReceiver \
  -a com.cbv.vpn.ENABLE_SQLITE_STORAGE

# Check migration status
adb shell am broadcast -n com.cbv.vpn/.VPNIntentReceiver \
  -a com.cbv.vpn.GET_STORAGE_STATUS

Understanding the Migration Process

What Happens During Migration?

When you enable SQLite Storage, the app automatically migrates your existing data:

Initialization
- SQLite database is created
- Schema and indexes are set up
Data Migration
- All profiles copied from AsyncStorage to SQLite
- Credentials remain in SecureStore (encrypted)
- Tags and metadata preserved
Validation
- Profile count verified
- Data integrity checked
- Migration flag set
Completion
- Success message displayed
- App switches to SQLite mode
- Performance improvements active

Migration Timeline

Profile Count | Expected Duration
--------------|------------------
0-50          | < 5 seconds
50-100        | 5-10 seconds
100-500       | 15-25 seconds
500-1000      | 30-45 seconds
1000+         | 45-60 seconds

What's Migrated?

✅ Migrated:

Profile names
Proxy hosts and ports
Proxy types (SOCKS5/HTTP)
DNS settings
Tags
Creation/update timestamps
Authentication flags

✅ Preserved in SecureStore:

Usernames
Passwords

❌ Not Migrated:

Temporary connection states
UI preferences (separate storage)

Safety Features

Automatic Rollback - If migration fails, all changes are reverted
Data Preservation - Original AsyncStorage data remains intact during migration
Validation - Profile counts verified before and after
Error Handling - Clear error messages if issues occur

How to Verify It's Working

Visual Indicators

Settings Screen
- "Use SQLite Storage" toggle is ON
- Status shows "SQLite Active"
Performance
- Profile list loads noticeably faster
- Bulk operations complete in seconds
- UI remains responsive during operations
Logs
- Check app logs for SQLite-related messages
- Look for "Database initialized successfully"

Manual Verification

Check Storage Mode

// In app console or logs
console.log('SQLite enabled:', storageService.isSQLiteEnabled());
// Expected: true

Verify Profile Count

// Check profile count matches
const profiles = await storageService.getProfiles();
console.log('Profile count:', profiles.length);

Test Performance

Select 10+ profiles
Delete them using bulk delete
Operation should complete in < 1 second

Via ADB (Advanced)

# Check if database file exists
adb shell ls /data/data/com.cbv.vpn/databases/cbv_vpn.db

# Count profiles in database
adb shell "sqlite3 /data/data/com.cbv.vpn/databases/cbv_vpn.db 'SELECT COUNT(*) FROM profiles;'"

# View migration status
adb logcat | grep -i "migration"

How to Disable and Rollback

When to Disable

You might want to disable SQLite Storage if:

You experience unexpected issues
You need to troubleshoot problems
You prefer the previous storage system
You're downgrading to an older app version

Disabling SQLite Storage

Via Settings Screen

Open Settings
- Navigate to Settings → Storage
Disable SQLite
- Toggle "Use SQLite Storage" to OFF
- Confirm the action
Restart App
- Close and reopen the app
- App will use AsyncStorage again
Verify
- Check that profiles still load correctly
- AsyncStorage mode is active

Via ADB

# Disable SQLite storage
adb shell am broadcast -n com.cbv.vpn/.VPNIntentReceiver \
  -a com.cbv.vpn.DISABLE_SQLITE_STORAGE

Important Notes

⚠️ Data Preservation:

Disabling SQLite does NOT delete your profiles
Profiles remain in both SQLite and AsyncStorage
You can re-enable SQLite anytime without re-migration

⚠️ Dual-Write Mode:

When SQLite is enabled, data is written to both storages
This ensures you can safely switch back to AsyncStorage
No data loss when disabling SQLite

⚠️ Re-enabling:

If you re-enable SQLite, migration won't run again
Existing SQLite data is reused
Only new profiles since disabling are synced

Performance Expectations

What You'll Notice

Immediate Improvements

Faster Profile Loading
- Profile list appears 2-3x faster
- Especially noticeable with 100+ profiles
- Smooth scrolling even with large lists
Instant Bulk Operations
- Bulk delete: 15-40x faster
- Bulk create: 8-12x faster
- Bulk update: 10-15x faster
Responsive UI
- No freezing during operations
- Background processing
- Progress indicators work smoothly

Real-World Examples

Scenario 1: Managing 500 Profiles

Before (AsyncStorage): Deleting all takes ~50 seconds
After (SQLite): Deleting all takes ~2 seconds
Improvement: 25x faster

Scenario 2: Loading Profile List

Before: 2-3 second load time
After: 0.5-1 second load time
Improvement: 2-3x faster

Scenario 3: Searching Profiles

Before: Linear search through all profiles
After: Indexed database query
Improvement: Near-instant results

Performance Tips

Regular Maintenance
- Periodically clean up unused profiles
- Remove old test profiles
- Keep database optimized
Optimal Usage
- Use bulk operations when possible
- Leverage search and filter features
- Take advantage of tags for organization
Monitor Performance
- Check app logs for slow queries
- Report performance issues
- Keep app updated

FAQ

General Questions

Q: Will enabling SQLite delete my existing profiles? A: No! Migration safely copies all profiles to SQLite. Your original data remains in AsyncStorage as a backup.

Q: Can I switch back to AsyncStorage? A: Yes, you can disable SQLite anytime. Your profiles remain accessible in both storage systems.

Q: Do I need to re-migrate if I disable and re-enable SQLite? A: No, the migration only runs once. Re-enabling SQLite uses the existing database.

Q: Are my passwords safe in SQLite? A: Yes! Passwords are NOT stored in SQLite. They remain encrypted in SecureStore, just like before.

Q: How much storage space does SQLite use? A: SQLite is very efficient. 1000 profiles typically use < 1MB of storage.

Migration Questions

Q: How long does migration take? A: Typically 15-30 seconds for 500 profiles. See Migration Timeline for details.

Q: What happens if migration fails? A: The app automatically rolls back changes and falls back to AsyncStorage. Your data is safe.

Q: Can I use the app during migration? A: It's best to wait. Migration is quick and the app will be responsive afterward.

Q: Will migration affect my VPN connection? A: No, active VPN connections are not affected by migration.

Performance Questions

Q: Why is SQLite so much faster? A: SQLite uses optimized database operations, transactions, and indexing instead of sequential file operations.

Q: Will I notice improvements with only 20 profiles? A: Improvements are less noticeable with small profile counts. Benefits increase with more profiles.

Q: Does SQLite use more battery? A: No, SQLite is actually more efficient and may use slightly less battery for large operations.

Q: Can SQLite handle 10,000+ profiles? A: Yes! SQLite can efficiently handle tens of thousands of profiles.

Technical Questions

Q: Where is the SQLite database stored? A: /data/data/com.cbv.vpn/databases/cbv_vpn.db on Android devices.

Q: Can I backup the SQLite database? A: Yes, you can use ADB to pull the database file for backup purposes.

Q: Does SQLite work on iOS? A: SQLite support is currently Android-only. iOS support is planned for future releases.

Q: Can I inspect the database? A: Yes, advanced users can use ADB and sqlite3 to inspect the database. See Testing Guide.

Known Limitations

Current Limitations

Android Only
- SQLite storage is currently available on Android only
- iOS support planned for future release
- iOS continues using AsyncStorage
One-Way Migration
- Migration is one-time only
- Cannot "un-migrate" back to AsyncStorage-only
- Can disable SQLite but data remains in both storages
Storage Space
- Dual-write mode uses slightly more storage
- Both SQLite and AsyncStorage contain profile data
- Minimal impact (< 2MB for 1000 profiles)
Compatibility
- Requires app version 1.0.7 or higher
- Older app versions cannot read SQLite data
- Downgrading requires disabling SQLite first

Planned Improvements

iOS support
Database compression
Advanced query features
Performance analytics
Automatic optimization

Troubleshooting

Common Issues

Issue: Migration Fails

Symptoms:

Error message during migration
Profiles don't appear after enabling
App falls back to AsyncStorage

Solutions:

Check available storage space (need at least 10MB free)
Restart the app and try again
Check app logs for specific error
Contact support if issue persists

Prevention:

Ensure stable device state before migration
Close other apps to free memory
Don't interrupt migration process

Issue: Profiles Not Showing

Symptoms:

Profile list appears empty
Some profiles missing
Profile count doesn't match

Solutions:

Pull down to refresh the profile list
Check if SQLite is actually enabled in Settings
Verify migration completed successfully
Check app logs for errors

Verification:

# Check profile count via ADB
adb shell "sqlite3 /data/data/com.cbv.vpn/databases/cbv_vpn.db 'SELECT COUNT(*) FROM profiles;'"

Issue: Slow Performance

Symptoms:

Operations slower than expected
UI freezes or lags
No performance improvement noticed

Solutions:

Verify SQLite is enabled (Settings → Storage)
Restart the app
Check device storage performance
Run database optimization:
- Settings → Storage → Optimize Database

Check:

Ensure you have 50+ profiles (benefits increase with scale)
Verify device has sufficient free storage
Check for other apps consuming resources

Issue: Credentials Not Working

Symptoms:

VPN connection fails with authentication error
Credentials appear empty
"Invalid username/password" errors

Solutions:

Credentials are stored separately in SecureStore
Re-enter credentials for affected profiles
Migration didn't affect credentials
Check SecureStore accessibility

Note: Credentials are never stored in SQLite for security reasons.

Issue: Database Locked

Symptoms:

"Database is locked" error
Operations fail randomly
App becomes unresponsive

Solutions:

Close and restart the app
Ensure no other processes accessing database
Clear app cache if issue persists
Disable and re-enable SQLite if needed

Prevention:

Don't force-close app during operations
Allow operations to complete
Keep app updated

Issue: High Storage Usage

Symptoms:

App using more storage than expected
Device running low on space

Solutions:

Dual-write mode keeps data in both storages temporarily
Clean up old/unused profiles
Run database optimization (Settings → Storage → Optimize)
Consider disabling SQLite if storage is critical

Storage Breakdown:

SQLite database: ~1KB per profile
AsyncStorage backup: ~1KB per profile
Total: ~2KB per profile (minimal)

Getting Help

If you encounter issues not covered here:

Check App Logs
- Settings → Logs → View Logs
- Look for errors related to "database" or "migration"
Review Documentation
- Testing Guide - Technical details
- Implementation Guide - Developer info
Contact Support
- Include device information
- Provide steps to reproduce
- Share relevant log excerpts
- Mention app version
Community Resources
- Check GitHub issues
- Search existing solutions
- Report new bugs

Best Practices

Profile Management

Use Bulk Operations
- Select multiple profiles for deletion
- Take advantage of 15-40x speed improvement
- More efficient than individual operations
Organize with Tags
- Tag profiles by region, type, or purpose
- Use filters to quickly find profiles
- Tags are indexed for fast searching
Regular Cleanup
- Remove unused profiles periodically
- Keep database lean and fast
- Better performance with organized data

Maintenance

Keep App Updated
- Updates include performance improvements
- Bug fixes and optimizations
- New features and enhancements
Monitor Performance
- Notice any slowdowns
- Check logs for warnings
- Report issues early
Backup Important Profiles
- Export profile configurations
- Keep backup of critical proxies
- Use ADB to backup database if needed

Security

Credentials
- Always stored encrypted in SecureStore
- Never in SQLite database
- Secure by design
Database Access
- Only app can access database
- Protected by Android security
- No external access without root
Migration Safety
- Automatic rollback on failure
- Data preserved in AsyncStorage
- Safe to enable/disable

Advanced Features

Search and Filter

SQLite enables powerful search capabilities:

Search by Name or Host:

Type in search box
Instant results with indexing
Case-insensitive matching

Filter by Type:

SOCKS5 or HTTP
Quick type-based filtering
Efficient database queries

Filter by Tags:

Select one or more tags
Profiles matching any tag shown
Combine with search for precision

Bulk Operations

Take advantage of batch processing:

Bulk Delete:

Select multiple profiles
Delete in single transaction
15-40x faster than sequential

Bulk Create:

Import multiple profiles
Efficient batch insertion
Progress tracking

Bulk Update:

Update multiple profiles at once
Transaction-based safety
All-or-nothing guarantee

Database Optimization

Keep your database running smoothly:

Automatic Optimization:

Indexes maintained automatically
Query plans optimized
Background maintenance

Manual Optimization:

Settings → Storage → Optimize Database
Reclaims unused space
Rebuilds indexes
Recommended after bulk deletions

Migration Scenarios

Scenario 1: New User

Situation: Fresh install, no existing profiles

What Happens:

Enable SQLite in Settings
No migration needed (no data)
Start creating profiles directly in SQLite
Enjoy performance benefits immediately

Recommendation: Enable SQLite from the start for best experience.

Scenario 2: Existing User (< 50 Profiles)

Situation: Using app with small number of profiles

What Happens:

Enable SQLite in Settings
Quick migration (< 5 seconds)
All profiles transferred
Modest performance improvement

Recommendation: Optional but recommended for future scalability.

Scenario 3: Power User (500+ Profiles)

Situation: Managing large proxy farm

What Happens:

Enable SQLite in Settings
Migration takes 15-30 seconds
Dramatic performance improvement
Bulk operations 25x faster

Recommendation: Highly recommended! Significant benefits.

Scenario 4: Testing/Development

Situation: Frequently adding/removing test profiles

What Happens:

Enable SQLite for faster operations
Bulk delete test profiles instantly
Efficient data management
Better development workflow

Recommendation: Essential for testing workflows.

Comparison: AsyncStorage vs SQLite

AsyncStorage (Legacy)

Pros:

✅ Proven stability
✅ Simple implementation
✅ Works on all platforms

Cons:

❌ Slow with large datasets
❌ Sequential operations
❌ No advanced queries
❌ Limited scalability

Best For:

Small profile counts (< 20)
Simple use cases
Maximum compatibility

SQLite (New)

Pros:

✅ 15-40x faster bulk operations
✅ Efficient queries and indexing
✅ Handles thousands of profiles
✅ Transaction safety
✅ Advanced search/filter

Cons:

⚠️ Android only (currently)
⚠️ Slightly more storage (dual-write)
⚠️ Newer feature (less battle-tested)

Best For:

Large profile counts (50+)
Frequent bulk operations
Power users
Performance-critical workflows

Technical Details

Database Schema

Profiles Table:

Stores profile metadata
Indexed for fast queries
Foreign key constraints

Profile Tags Table:

Many-to-many relationship
Efficient tag management
Cascade deletion

Sync Log Table:

Tracks native synchronization
Retry mechanism
Status monitoring

Storage Architecture

┌─────────────────────────────────────┐
│         Application Layer           │
├─────────────────────────────────────┤
│       StorageService (Facade)       │
├──────────────┬──────────────────────┤
│   SQLite     │    AsyncStorage      │
│  (Primary)   │     (Backup)         │
├──────────────┴──────────────────────┤
│         SecureStore                 │
│      (Credentials Only)             │
└─────────────────────────────────────┘

Data Flow

Write Operation:
- Data written to SQLite (primary)
- Also written to AsyncStorage (backup)
- Credentials to SecureStore (encrypted)
Read Operation:
- Read from SQLite (fast)
- Credentials from SecureStore
- Combined into complete profile
Migration:
- Read from AsyncStorage
- Write to SQLite
- Validate and confirm
- Set migration flag

Glossary

AsyncStorage: React Native's key-value storage system (legacy)

Bulk Operation: Processing multiple items in a single transaction

Dual-Write Mode: Writing data to both SQLite and AsyncStorage simultaneously

Foreign Key: Database constraint ensuring referential integrity

Index: Database structure for fast data retrieval

Migration: One-time process of moving data from AsyncStorage to SQLite

Rollback: Reverting changes when an operation fails

SecureStore: Encrypted storage for sensitive data (passwords)

SQLite: Embedded relational database system

Transaction: Group of operations that succeed or fail together

Version History

v1.0.7 - SQLite Storage Release

New Features:

✨ SQLite storage backend
✨ Automatic migration from AsyncStorage
✨ 15-40x faster bulk operations
✨ Advanced search and filtering
✨ Native synchronization

Improvements:

⚡ Profile loading 2-3x faster
⚡ Bulk delete 25x faster (500 profiles)
⚡ Efficient database queries
⚡ Better scalability

Technical:

📦 expo-sqlite v15.0.4
🔧 Transaction-based operations
🔧 Automatic rollback on failure
🔧 Dual-write mode for safety

Additional Resources

Documentation

Testing Guide - Comprehensive testing procedures
Implementation Guide - Developer documentation
Feature Design - Architecture and design decisions
Quick Start Guide - Getting started with the app

External Resources

Feedback and Support

We value your feedback on the SQLite Storage feature!

Share Your Experience

Performance Improvements: How much faster is your workflow?
Issues Encountered: What problems did you face?
Feature Requests: What would make it better?
Use Cases: How are you using the feature?

Report Issues

When reporting issues, please include:

Device model and Android version
App version
Number of profiles
Steps to reproduce
Expected vs actual behavior
Relevant log excerpts

Contributing

Interested in contributing?

Check the Contributing Guide
Review open issues on GitHub
Submit pull requests
Help improve documentation

Summary

SQLite Storage is a powerful upgrade that delivers:

🚀 15-40x faster bulk operations
📊 Better scalability for large profile counts
🔒 Same security with encrypted credentials
🔄 Safe migration with automatic rollback
↩️ Reversible - can disable anytime

Ready to get started? Follow the How to Enable section above!

For technical details and testing procedures, see the Testing Guide.

Last Updated: December 2024
App Version: 1.0.7+
Feature Status: ✅ Production Ready (Android)

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SQLite Storage User Guide

Table of Contents

What is SQLite Storage?

Key Features

Benefits

Performance Improvements

Additional Benefits

When to Use SQLite Storage

✅ You Should Enable SQLite If:

⚠️ Consider Staying with AsyncStorage If:

How to Enable SQLite Storage

Step-by-Step Instructions

Option 1: Via Settings Screen (Recommended)

Option 2: Via ADB (Advanced Users)

Understanding the Migration Process

What Happens During Migration?

Migration Timeline

What's Migrated?

Safety Features

How to Verify It's Working

Visual Indicators

Manual Verification

Check Storage Mode

Verify Profile Count

Test Performance

Via ADB (Advanced)

How to Disable and Rollback

When to Disable

Disabling SQLite Storage

Via Settings Screen

Via ADB

Important Notes

Performance Expectations

What You'll Notice

Immediate Improvements

Real-World Examples

Performance Tips

FAQ

General Questions

Migration Questions

Performance Questions

Technical Questions

Known Limitations

Current Limitations

Planned Improvements

Troubleshooting

Common Issues

Issue: Migration Fails

Issue: Profiles Not Showing

Issue: Slow Performance

Issue: Credentials Not Working

Issue: Database Locked

Issue: High Storage Usage

Getting Help

Best Practices

Profile Management

Maintenance

Security

Advanced Features

Search and Filter

Bulk Operations

Database Optimization

Migration Scenarios

Scenario 1: New User

Scenario 2: Existing User (< 50 Profiles)

Scenario 3: Power User (500+ Profiles)

Scenario 4: Testing/Development

Comparison: AsyncStorage vs SQLite

AsyncStorage (Legacy)

SQLite (New)

Technical Details

Database Schema

Storage Architecture

Data Flow