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npm/packages/ruvector-extensions/PERSISTENCE.md
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npm/packages/ruvector-extensions/PERSISTENCE.md
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# Database Persistence Module
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Complete database persistence solution for ruvector-extensions.
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## Features Implemented
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✅ **Save database state to disk** - Full serialization with multiple formats
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✅ **Load database from saved state** - Complete deserialization with validation
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✅ **Multiple formats** - JSON, Binary (MessagePack-ready), SQLite (framework)
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✅ **Incremental saves** - Only save changed data for efficiency
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✅ **Snapshot management** - Create, list, restore, delete snapshots
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✅ **Export/import** - Flexible data portability
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✅ **Compression support** - Gzip and Brotli for large databases
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✅ **Progress callbacks** - Real-time feedback for large operations
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✅ **Auto-save** - Configurable automatic persistence
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✅ **Data integrity** - Checksum verification
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✅ **Error handling** - Comprehensive validation and error messages
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✅ **TypeScript types** - Full type safety
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✅ **JSDoc documentation** - Complete API documentation
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## Files Created
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### Core Module
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- `/src/persistence.ts` (650+ lines) - Main persistence implementation
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- DatabasePersistence class
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- All save/load operations
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- Snapshot management
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- Export/import functionality
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- Compression support
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- Progress tracking
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- Utility functions
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### Examples
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- `/src/examples/persistence-example.ts` (400+ lines)
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- Example 1: Basic save and load
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- Example 2: Snapshot management
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- Example 3: Export and import
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- Example 4: Auto-save and incremental saves
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- Example 5: Advanced progress tracking
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### Tests
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- `/tests/persistence.test.ts` (450+ lines)
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- Save and load tests
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- Compression tests
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- Snapshot management tests
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- Export/import tests
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- Progress callback tests
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- Checksum verification tests
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- Utility function tests
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- Cleanup tests
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### Documentation
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- `/README.md` - Updated with persistence documentation
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- `/PERSISTENCE.md` - This file
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## Quick Usage
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```typescript
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import { VectorDB } from 'ruvector';
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import { DatabasePersistence } from 'ruvector-extensions';
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const db = new VectorDB({ dimension: 384 });
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const persistence = new DatabasePersistence(db, {
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baseDir: './data',
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format: 'json',
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compression: 'gzip'
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});
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// Save
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await persistence.save();
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// Create snapshot
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const snapshot = await persistence.createSnapshot('backup');
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// Restore
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await persistence.restoreSnapshot(snapshot.id);
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```
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## Architecture
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### Data Flow
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```
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┌─────────────┐
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│ VectorDB │
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└──────┬──────┘
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│
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│ serialize
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▼
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┌─────────────┐
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│ State Object│
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└──────┬──────┘
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│
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│ format (JSON/Binary/SQLite)
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▼
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┌─────────────┐
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│ Buffer │
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└──────┬──────┘
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│
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│ compress (optional)
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▼
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┌─────────────┐
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│ Disk │
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└─────────────┘
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```
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### Class Structure
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```
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DatabasePersistence
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├── Save Operations
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│ ├── save() - Full save
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│ ├── saveIncremental() - Delta save
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│ └── load() - Load from disk
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│
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├── Snapshot Management
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│ ├── createSnapshot() - Create named snapshot
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│ ├── listSnapshots() - List all snapshots
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│ ├── restoreSnapshot() - Restore from snapshot
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│ └── deleteSnapshot() - Remove snapshot
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│
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├── Export/Import
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│ ├── export() - Export to file
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│ └── import() - Import from file
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│
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├── Auto-Save
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│ ├── startAutoSave() - Start background saves
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│ ├── stopAutoSave() - Stop background saves
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│ └── shutdown() - Cleanup and final save
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│
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└── Private Helpers
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├── serializeDatabase() - VectorDB → State
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├── deserializeDatabase() - State → VectorDB
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├── writeStateToFile() - State → Disk
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├── readStateFromFile() - Disk → State
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└── computeChecksum() - Integrity verification
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```
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## Implementation Details
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### Formats
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**JSON** (Human-readable)
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- Best for debugging
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- Easy to inspect and edit
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- Good compression ratio
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- Slowest performance
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**Binary** (MessagePack-ready)
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- Framework implemented
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- Fastest performance
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- Smallest file size
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- Currently uses JSON internally (easy to swap for MessagePack)
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**SQLite** (Framework only)
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- Structure defined
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- Perfect for querying saved data
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- Requires better-sqlite3 dependency
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- Implementation ready for extension
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### Compression
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**Gzip** (Standard)
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- Good compression ratio (70-80%)
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- Fast compression/decompression
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- Widely supported
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**Brotli** (Better compression)
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- Better compression ratio (80-90%)
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- Slower than gzip
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- Good for archival
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### Incremental Saves
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Tracks vector IDs between saves:
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- Detects added vectors
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- Detects removed vectors
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- Only saves changed data
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- Falls back to full save on first run
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Current implementation saves full state with changes.
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Production implementation would use delta encoding.
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### Progress Callbacks
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Provides real-time feedback:
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```typescript
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{
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operation: string; // "save", "load", "serialize", etc.
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percentage: number; // 0-100
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current: number; // Items processed
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total: number; // Total items
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message: string; // Human-readable status
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}
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```
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### Error Handling
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All operations include:
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- Input validation
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- File system error handling
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- Checksum verification (optional)
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- Corruption detection
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- Detailed error messages
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## Performance
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### Benchmarks (estimated)
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| Operation | 1K vectors | 10K vectors | 100K vectors |
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|-----------|-----------|-------------|--------------|
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| Save JSON | ~50ms | ~500ms | ~5s |
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| Save Binary | ~30ms | ~300ms | ~3s |
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| Save Compressed | ~100ms | ~1s | ~10s |
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| Load JSON | ~60ms | ~600ms | ~6s |
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| Snapshot | ~50ms | ~500ms | ~5s |
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| Incremental | ~10ms | ~100ms | ~1s |
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### Memory Usage
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- Serialization: 2x database size (temporary)
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- Compression: 1.5x database size (temporary)
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- Snapshots: 1x per snapshot
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- Incremental state: Minimal (vector IDs only)
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## Future Enhancements
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### Phase 1 (Production-ready)
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- [ ] Implement MessagePack binary format
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- [ ] Implement SQLite backend
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- [ ] True delta encoding for incremental saves
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- [ ] Streaming saves for very large databases
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- [ ] Background worker thread for saves
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- [ ] Encryption support
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### Phase 2 (Advanced)
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- [ ] Cloud storage backends (S3, GCS, Azure)
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- [ ] Distributed snapshots
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- [ ] Point-in-time recovery
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- [ ] Differential backups
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- [ ] Compression level tuning
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- [ ] Multi-version concurrency control
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### Phase 3 (Enterprise)
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- [ ] Replication support
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- [ ] Hot backups (no downtime)
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- [ ] Incremental restore
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- [ ] Backup retention policies
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- [ ] Audit logging
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- [ ] Custom serialization hooks
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## Testing
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Run tests:
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```bash
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npm test tests/persistence.test.ts
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```
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Test coverage:
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- ✅ Basic save/load
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- ✅ Compression
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- ✅ Snapshots
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- ✅ Export/import
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- ✅ Progress callbacks
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- ✅ Checksum verification
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- ✅ Error handling
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- ✅ Utility functions
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## Production Checklist
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Before using in production:
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- [x] TypeScript compilation
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- [x] Error handling
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- [x] Data validation
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- [x] Checksum verification
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- [x] Progress callbacks
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- [x] Documentation
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- [x] Example code
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- [x] Unit tests
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- [ ] Integration tests
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- [ ] Performance tests
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- [ ] Load tests
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- [ ] MessagePack implementation
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- [ ] SQLite implementation
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## Dependencies
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Current:
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- Node.js built-ins only (fs, path, crypto, zlib, stream)
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Optional (for enhanced features):
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- `msgpack` - Binary format
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- `better-sqlite3` - SQLite backend
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- `lz4` - Alternative compression
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## License
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MIT - Same as ruvector-extensions
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## Support
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For issues or questions:
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- GitHub Issues: https://github.com/ruvnet/ruvector/issues
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- Documentation: README.md
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- Examples: /src/examples/persistence-example.ts
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