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This document outlines the migration process from Dexie.js to absurd-sql for the TimeSafari app's storage implementation. The migration aims to provide a consistent SQLite-based storage solution across all platforms while maintaining data integrity and ensuring a smooth transition for users.This document outlines the migration process from Dexie.js to absurd-sql for the TimeSafari app's storage implementation. The migration aims to provide a consistent SQLite-based storage solution across all platforms while maintaining data integrity and ensuring a smooth transition for users.
**Current Status**: The migration is in **Phase 2** with a well-defined migration fence in place. Core settings and account data have been migrated, with contact migration in progress.**Current Status**: The migration is in **Phase 2** with a well-defined migration fence in place. Core settings and account data have been migrated, with contact migration in progress. **ActiveDid migration has been implemented** to ensure user identity continuity.
## Migration Goals## Migration Goals
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- Preserve all existing data - Preserve all existing data
- Maintain data relationships - Maintain data relationships
- Ensure data consistency - Ensure data consistency
- **Preserve user's active identity**
2. **Performance**2. **Performance**
- Improve query performance - Improve query performance
- Reduce storage overhead - Reduce storage overhead
- Optimize for platform-specific featur es - Optimize for platform-specific capabiliti es
3. **Security **3. **User Experience **
- Maintain or improve encryption - Seamless transition with no data loss
- Preserve access control s - Maintain user's active identity and preference s
- Enhance data protection - Preserve application state
4. **User Experience**## Migration Architecture
- Zero data loss
- Minimal downtime
- Automatic migration where possible
## Migration Fence### Migration Fence
The migration fence is defined by the `USE_DEXIE_DB` constant in `src/constants/app.ts` :
- `USE_DEXIE_DB = false` (default): Uses SQLite database
- `USE_DEXIE_DB = true` : Uses Dexie database (for migration purposes)
The migration is controlled by a **migration fence** that separates legacy Dexie code from the new SQLite implementation. See [Migration Fence Definition ](./migration-fence-definition.md ) for complete details.### Migration Order
The migration follows a specific order to maintain data integrity:
### Key Fence Components1. **Accounts** (foundational - contains DIDs)
2. **Settings** (references accountDid, activeDid)
3. **ActiveDid** (depends on accounts and settings) ⭐ **NEW**
4. **Contacts** (independent, but migrated after accounts for consistency)
1. **Configuration Control** : `USE_DEXIE_DB = false` (default)## ActiveDid Migration ⭐ **NEW FEATURE**
2. **Service Layer** : All database operations go through `PlatformService`
3. **Migration Tools** : Exclusive access to both databases during migration
4. **Code Boundaries** : Clear separation between legacy and new code
## Prerequisites### Problem Solved
Previously, the `activeDid` setting was not migrated from Dexie to SQLite, causing users to lose their active identity after migration.
1. **Backup Requirements**### Solution Implemented
```typescriptThe migration now includes a dedicated step for migrating the `activeDid` :
interface MigrationBackup {
timestamp: number;
accounts: Account[];
settings: Setting[];
contacts: Contact[];
metadata: {
version: string;
platform: string;
dexieVersion: string;
};
}
```
2. **Dependencies**
```json
{
"@jlongster/sql.js": "^1.8.0",
"absurd-sql": "^1.8.0"
}
```
3. **Storage Requirements**1. **Detection** : Identifies the `activeDid` from Dexie master settings
- Sufficient IndexedDB quota2. **Validation** : Verifies the `activeDid` exists in SQLite accounts
- Available disk space for SQLite3. **Migration** : Updates SQLite master settings with the `activeDid`
- Backup storage space4. **Error Handling** : Graceful handling of missing accounts
4. **Platform Support**
- Web: Modern browser with IndexedDB support
- iOS: iOS 13+ with SQLite support
- Android: Android 5+ with SQLite support
- Electron: Latest version with SQLite support
## Current Migration Status
### ✅ Completed
- **SQLite Database Service** : Fully implemented with absurd-sql
- **Platform Service Layer** : Unified database interface
- **Migration Tools** : Data comparison and transfer utilities
- **Settings Migration** : Core user settings transferred
- **Account Migration** : Identity and key management
- **Schema Migration** : Complete table structure migration
### 🔄 In Progress
- **Contact Migration** : User contact data (via import interface)
- **Data Verification** : Comprehensive integrity checks
- **Performance Optimization** : Query optimization and indexing
### 📋 Planned
- **Code Cleanup** : Remove unused Dexie imports
- **Documentation Updates** : Complete migration guides
- **Testing** : Comprehensive migration testing
## Migration Process
### 1. Preparation ### Implementation Details
#### New Function: `migrateActiveDid()`
```typescript```typescript
// src/services/storage/migration/MigrationService.tsexport async function migrateActiveDid(): Promise< MigrationResult > {
import initSqlJs from '@jlongster/sql.js'; // 1. Get Dexie settings to find the activeDid
import { SQLiteFS } from 'absurd-sql'; const dexieSettings = await getDexieSettings();
import IndexedDBBackend from 'absurd-sql/dist/indexeddb-backend'; const masterSettings = dexieSettings.find(setting => !setting.accountDid);
class MigrationService { // 2. Verify the activeDid exists in SQLite accounts
private async checkPrerequisites(): Promise< void > { const accountExists = await platformService.dbQuery(
// Check IndexedDB availability "SELECT did FROM accounts WHERE did = ?",
if (!window.indexedDB) { [dexieActiveDid],
throw new StorageError(
'IndexedDB not available',
StorageErrorCodes.INITIALIZATION_FAILED
); );
}
// Check storage quota
const quota = await navigator.storage.estimate();
if (quota.quota & & quota.usage & & quota.usage > quota.quota * 0.9) {
throw new StorageError(
'Insufficient storage space',
StorageErrorCodes.STORAGE_FULL
);
}
// Check platform support
const capabilities = await PlatformDetection.getCapabilities();
if (!capabilities.hasFileSystem) {
throw new StorageError(
'Platform does not support required features',
StorageErrorCodes.INITIALIZATION_FAILED
);
}
}
private async createBackup(): Promise< MigrationBackup > { // 3. Update SQLite master settings
const dexieDB = new Dexie('TimeSafariDB'); await updateDefaultSettings({ activeDid: dexieActiveDid });
return {
timestamp: Date.now(),
accounts: await dexieDB.accounts.toArray(),
settings: await dexieDB.settings.toArray(),
contacts: await dexieDB.contacts.toArray(),
metadata: {
version: '1.0.0',
platform: await PlatformDetection.getPlatform(),
dexieVersion: Dexie.version
}
};
}
}}
``````
### 2. Data Migration#### Enhanced `migrateSettings()` Function
The settings migration now includes activeDid handling:
- Extracts `activeDid` from Dexie master settings
- Validates account existence in SQLite
- Updates SQLite master settings with the `activeDid`
#### Updated `migrateAll()` Function
The complete migration now includes a dedicated step for activeDid:
```typescript```typescript
// src/services/storage/migration/DataMigration.ts// Step 3: Migrate ActiveDid (depends on accounts and settings)
class DataMigration {logger.info("[MigrationService] Step 3: Migrating activeDid...");
async migrateAccounts(): Promise< MigrationResult > {const activeDidResult = await migrateActiveDid();
const result: MigrationResult = {```
success: true,
accountsMigrated: 0,
errors: [],
warnings: []
};
try {
const dexieAccounts = await this.getDexieAccounts();
for (const account of dexieAccounts) {
try {
await this.migrateAccount(account);
result.accountsMigrated++;
} catch (error) {
result.errors.push(`Failed to migrate account ${account.did}: ${error}`);
result.success = false;
}
}
} catch (error) {
result.errors.push(`Account migration failed: ${error}`);
result.success = false;
}
return result;### Benefits
}- ✅ **User Identity Preservation** : Users maintain their active identity
- ✅ **Seamless Experience** : No need to manually select identity after migration
- ✅ **Data Consistency** : Ensures all identity-related settings are preserved
- ✅ **Error Resilience** : Graceful handling of edge cases
async migrateSettings(): Promise< MigrationResult > {## Migration Process
const result: MigrationResult = {
success: true,
settingsMigrated: 0,
errors: [],
warnings: []
};
try {
const dexieSettings = await this.getDexieSettings();
for (const setting of dexieSettings) {
try {
await this.migrateSetting(setting);
result.settingsMigrated++;
} catch (error) {
result.errors.push(`Failed to migrate setting ${setting.id}: ${error}`);
result.success = false;
}
}
} catch (error) {
result.errors.push(`Settings migration failed: ${error}`);
result.success = false;
}
return result;### Phase 1: Preparation ✅
}- [x] Enable Dexie database access
- [x] Implement data comparison tools
- [x] Create migration service structure
async migrateContacts(): Promise< MigrationResult > {### Phase 2: Core Migration ✅
// Contact migration is handled through the contact import interface- [x] Account migration with `importFromMnemonic`
// This provides better user control and validation- [x] Settings migration (excluding activeDid)
const result: MigrationResult = {- [x] **ActiveDid migration** ⭐ **COMPLETED**
success: true,- [x] Contact migration framework
contactsMigrated: 0,
errors: [],
warnings: []
};
try {
const dexieContacts = await this.getDexieContacts();
// Redirect to contact import view with pre-populated data
await this.redirectToContactImport(dexieContacts);
result.contactsMigrated = dexieContacts.length;
} catch (error) {
result.errors.push(`Contact migration failed: ${error}`);
result.success = false;
}
return result;### Phase 3: Validation and Cleanup 🔄
}- [ ] Comprehensive data validation
}- [ ] Performance testing
```- [ ] User acceptance testing
- [ ] Dexie removal
### 3. Verification ## Usage
### Manual Migration
```typescript```typescript
class MigrationVerification {import { migrateAll, migrateActiveDid } from '../services/indexedDBMigrationService';
async verifyMigration(dexieData: MigrationData): Promise< boolean > {
// Verify account count
const accountResult = await this.sqliteDB.exec('SELECT COUNT(*) as count FROM accounts');
const accountCount = accountResult[0].values[0][0];
if (accountCount !== dexieData.accounts.length) {
return false;
}
// Verify settings count
const settingsResult = await this.sqliteDB.exec('SELECT COUNT(*) as count FROM settings');
const settingsCount = settingsResult[0].values[0][0];
if (settingsCount !== dexieData.settings.length) {
return false;
}
// Verify data integrity// Complete migration
for (const account of dexieData.accounts) {const result = await migrateAll();
const result = await this.sqliteDB.exec(
'SELECT * FROM accounts WHERE did = ?',
[account.did]
);
const migratedAccount = result[0]?.values[0];
if (!migratedAccount ||
migratedAccount[1] !== account.publicKeyHex) {
return false;
}
}
return true;// Or migrate just the activeDid
}const activeDidResult = await migrateActiveDid();
}
``````
## Using the Migration Interface### Migration Verification
```typescript
### Accessing Migration Toolsimport { compareDatabases } from '../services/indexedDBMigrationService';
1. Navigate to the **Account** page in the TimeSafari app
2. Scroll down to find the **Database Migration** link
3. Click the link to open the migration interface
### Migration Steps
1. **Compare Databases**
- Click "Compare Databases" to see differences
- Review the comparison results
- Identify data that needs migration
2. **Migrate Settings**
- Click "Migrate Settings" to transfer user settings
- Verify settings are correctly transferred
- Check application functionality
3. **Migrate Contacts**
- Click "Migrate Contacts" to open contact import
- Review and confirm contact data
- Complete the import process
4. **Verify Migration**const comparison = await compareDatabases();
- Run comparison again to verify completionconsole.log('Migration differences:', comparison.differences);
- Test application functionality```
- Export backup data if needed
## Error Handling## Error Handling
### Common Issues### ActiveDid Migration Errors
- **Missing Account** : If the `activeDid` from Dexie doesn't exist in SQLite accounts
1. **Dexie Database Not Enabled**- **Database Errors** : Connection or query failures
- **Error** : "Dexie database is not enabled"- **Settings Update Failures** : Issues updating SQLite master settings
- **Solution** : Set `USE_DEXIE_DB = true` in `constants/app.ts` temporarily
2. **Database Connection Issues**### Recovery Strategies
- **Error** : "Failed to retrieve data"1. **Automatic Recovery** : Migration continues even if activeDid migration fails
- **Solution** : Check database initialization and permissions2. **Manual Recovery** : Users can manually select their identity after migration
3. **Fallback** : System creates new identity if none exists
3. **Migration Failures**## Security Considerations
- **Error** : "Migration failed: [specific error]"
- **Solution** : Review error details and check data integrity
### Error Recovery### Data Protection
- All sensitive data (mnemonics, private keys) are encrypted
- Migration preserves encryption standards
- No plaintext data exposure during migration
1. **Review** error messages carefully### Identity Verification
2. **Check** browser console for additional details- ActiveDid migration validates account existence
3. **Verify** database connectivity and permissions- Prevents setting non-existent identities as active
4. **Retry** the operation if appropriate- Maintains cryptographic integrity
5. **Export** comparison data for manual review if needed
## Best Practices ## Testing
### Before Migration### Migration Testing
```bash
# Enable Dexie for testing
# Set USE_DEXIE_DB = true in constants/app.ts
1. **Backup** your data if possible# Run migration
2. **Test** the migration on a small dataset firstnpm run migrate
3. **Verify** that both databases are accessible
4. **Review** the comparison results before migrating
### During Migration# Verify results
npm run test:migration
```
1. **Don't** interrupt the migration process### ActiveDid Testing
2. **Monitor** the progress and error messages```typescript
3. **Note** any warnings or skipped records// Test activeDid migration specifically
4. **Export** comparison data for referenceconst result = await migrateActiveDid();
expect(result.success).toBe(true);
expect(result.warnings).toContain('Successfully migrated activeDid');
```
### After Migration## Troubleshooting
1. **Verify** that data was migrated correctly### Common Issues
2. **Test** the application functionality
3. **Disable** Dexie database (`USE_DEXIE_DB = false`)
4. **Clean up** any temporary files or exports
## Performance Considerations1. **ActiveDid Not Found**
- Ensure accounts were migrated before activeDid migration
- Check that the Dexie activeDid exists in SQLite accounts
### 1. Migration Performance2. **Migration Failures**
- Use transactions for bulk data transfer - Verify Dexie database is accessible
- Implement progress indicator s - Check SQLite database permission s
- Process data in background when possible - Review migration logs for specific errors
### 2. Application Performance 3. **Data Inconsistencies**
- Optimize SQLite queri es - Use `compareDatabases()` to identify differenc es
- Maintain proper database indexes - Re-run migration if necessary
- Use efficient memory management - Check for duplicate or conflicting records
## Security Considerations### Debugging
```typescript
// Enable detailed logging
logger.setLevel('debug');
### 1. Data Protection// Check migration status
- Maintain encryption standards across migrationconst comparison = await compareDatabases();
- Preserve user privacy during migration console.log('Settings differences:', comparison.differences.settings);
- Log all migration operations ```
### 2. Error Handling## Future Enhancements
- Handle migration failures gracefully
- Provide clear user messaging
- Maintain rollback capabilities
## Testing Strategy### Planned Improvements
1. **Batch Processing** : Optimize for large datasets
2. **Incremental Migration** : Support partial migrations
3. **Rollback Capability** : Ability to revert migration
4. **Progress Tracking** : Real-time migration progress
### 1. Migration Testing### Performance Optimizations
```typescript1. **Parallel Processing** : Migrate independent data concurrently
describe('Database Migration', () => {2. **Memory Management** : Optimize for large datasets
it('should migrate data without loss', async () => {3. **Transaction Batching** : Reduce database round trips
// 1. Enable Dexie
// 2. Create test data
// 3. Run migration
// 4. Verify data integrity
// 5. Disable Dexie
});
});
```
### 2. Application Testing
```typescript
describe('Feature with Database', () => {
it('should work with SQLite only', async () => {
// Test with USE_DEXIE_DB = false
// Verify all operations use PlatformService
});
});
```
## Conclusion## Conclusion
The migration from Dexie to absurd-sql provides:The Dexie to SQLite migration provides a robust, secure, and user-friendly transition path. The addition of activeDid migration ensures that users maintain their identity continuity throughout the migration process, significantly improving the user experience.
- **Better Performance** : Improved query performance and storage efficiency
- **Cross-Platform Consistency** : Unified database interface across platforms
- **Enhanced Security** : Better encryption and access controls
- **Future-Proof Architecture** : Modern SQLite-based storage system
The migration fence ensures a controlled and safe transition while maintaining data integrity and application stabil ity. The migration fence architecture allows for controlled, reversible migration while maintaining application stability and data integrity.
Matthew Raymer
4 months ago