# Storage Implementation Checklist

## Core Services

### 1. Storage Service Layer
- [ ] Create base `StorageService` interface
  - [ ] Define common methods for all platforms
  - [ ] Add platform-specific method signatures
  - [ ] Include error handling types
  - [ ] Add migration support methods

- [ ] Implement platform-specific services
  - [ ] `WebSQLiteService` (absurd-sql)
    - [ ] Database initialization
    - [ ] VFS setup with IndexedDB backend
    - [ ] Connection management
    - [ ] Query builder
  - [ ] `NativeSQLiteService` (iOS/Android)
    - [ ] SQLCipher integration
    - [ ] Native bridge setup
    - [ ] File system access
  - [ ] `ElectronSQLiteService`
    - [ ] Node SQLite integration
    - [ ] IPC communication
    - [ ] File system access

### 2. Migration Services
- [ ] Implement `MigrationService`
  - [ ] Backup creation
  - [ ] Data verification
  - [ ] Rollback procedures
  - [ ] Progress tracking
- [ ] Create `MigrationUI` components
  - [ ] Progress indicators
  - [ ] Error handling
  - [ ] User notifications
  - [ ] Manual triggers

### 3. Security Layer
- [ ] Implement `EncryptionService`
  - [ ] Key management
  - [ ] Encryption/decryption
  - [ ] Secure storage
- [ ] Add `BiometricService`
  - [ ] Platform detection
  - [ ] Authentication flow
  - [ ] Fallback mechanisms

## Platform-Specific Implementation

### Web Platform
- [ ] Setup absurd-sql
  - [ ] Install dependencies
    ```json
    {
      "@jlongster/sql.js": "^1.8.0",
      "absurd-sql": "^1.8.0"
    }
    ```
  - [ ] Configure VFS with IndexedDB backend
  - [ ] Setup worker threads
  - [ ] Implement connection pooling
  - [ ] Configure database pragmas
    ```sql
    PRAGMA journal_mode=MEMORY;
    PRAGMA synchronous=NORMAL;
    PRAGMA foreign_keys=ON;
    PRAGMA busy_timeout=5000;
    ```

- [ ] Update build configuration
  - [ ] Modify `vite.config.ts`
  - [ ] Add worker configuration
  - [ ] Update chunk splitting
  - [ ] Configure asset handling

- [ ] Implement IndexedDB fallback
  - [ ] Create fallback service
  - [ ] Add data synchronization
  - [ ] Handle quota exceeded
  - [ ] Implement atomic operations

### iOS Platform
- [ ] Setup SQLCipher
  - [ ] Install pod dependencies
  - [ ] Configure encryption
  - [ ] Setup keychain access
  - [ ] Implement secure storage

- [ ] Update Capacitor config
  - [ ] Modify `capacitor.config.ts`
  - [ ] Add iOS permissions
  - [ ] Configure backup
  - [ ] Setup app groups

### Android Platform
- [ ] Setup SQLCipher
  - [ ] Add Gradle dependencies
  - [ ] Configure encryption
  - [ ] Setup keystore
  - [ ] Implement secure storage

- [ ] Update Capacitor config
  - [ ] Modify `capacitor.config.ts`
  - [ ] Add Android permissions
  - [ ] Configure backup
  - [ ] Setup file provider

### Electron Platform
- [ ] Setup Node SQLite
  - [ ] Install dependencies
  - [ ] Configure IPC
  - [ ] Setup file system access
  - [ ] Implement secure storage

- [ ] Update Electron config
  - [ ] Modify `electron.config.ts`
  - [ ] Add security policies
  - [ ] Configure file access
  - [ ] Setup auto-updates

## Data Models and Types

### 1. Database Schema
- [ ] Define tables
  ```sql
  -- Accounts table
  CREATE TABLE accounts (
    did TEXT PRIMARY KEY,
    public_key_hex TEXT NOT NULL,
    created_at INTEGER NOT NULL,
    updated_at INTEGER NOT NULL
  );

  -- Settings table
  CREATE TABLE settings (
    key TEXT PRIMARY KEY,
    value TEXT NOT NULL,
    updated_at INTEGER NOT NULL
  );

  -- Contacts table
  CREATE TABLE contacts (
    id TEXT PRIMARY KEY,
    did TEXT NOT NULL,
    name TEXT,
    created_at INTEGER NOT NULL,
    updated_at INTEGER NOT NULL,
    FOREIGN KEY (did) REFERENCES accounts(did)
  );

  -- Indexes for performance
  CREATE INDEX idx_accounts_created_at ON accounts(created_at);
  CREATE INDEX idx_contacts_did ON contacts(did);
  CREATE INDEX idx_settings_updated_at ON settings(updated_at);
  ```

- [ ] Create indexes
- [ ] Define constraints
- [ ] Add triggers
- [ ] Setup migrations

### 2. Type Definitions
- [ ] Create interfaces
  ```typescript
  interface Account {
    did: string;
    publicKeyHex: string;
    createdAt: number;
    updatedAt: number;
  }

  interface Setting {
    key: string;
    value: string;
    updatedAt: number;
  }

  interface Contact {
    id: string;
    did: string;
    name?: string;
    createdAt: number;
    updatedAt: number;
  }
  ```

- [ ] Add validation
- [ ] Create DTOs
- [ ] Define enums
- [ ] Add type guards

## UI Components

### 1. Migration UI
- [ ] Create components
  - [ ] `MigrationProgress.vue`
  - [ ] `MigrationError.vue`
  - [ ] `MigrationSettings.vue`
  - [ ] `MigrationStatus.vue`

### 2. Settings UI
- [ ] Update components
  - [ ] Add storage settings
  - [ ] Add migration controls
  - [ ] Add backup options
  - [ ] Add security settings

### 3. Error Handling UI
- [ ] Create components
  - [ ] `StorageError.vue`
  - [ ] `QuotaExceeded.vue`
  - [ ] `MigrationFailed.vue`
  - [ ] `RecoveryOptions.vue`

## Testing

### 1. Unit Tests
- [ ] Test services
  - [ ] Storage service tests
  - [ ] Migration service tests
  - [ ] Security service tests
  - [ ] Platform detection tests

### 2. Integration Tests
- [ ] Test migrations
  - [ ] Web platform tests
  - [ ] iOS platform tests
  - [ ] Android platform tests
  - [ ] Electron platform tests

### 3. E2E Tests
- [ ] Test workflows
  - [ ] Account management
  - [ ] Settings management
  - [ ] Contact management
  - [ ] Migration process

## Documentation

### 1. Technical Documentation
- [ ] Update architecture docs
- [ ] Add API documentation
- [ ] Create migration guides
- [ ] Document security measures

### 2. User Documentation
- [ ] Update user guides
- [ ] Add troubleshooting guides
- [ ] Create FAQ
- [ ] Document new features

## Deployment

### 1. Build Process
- [ ] Update build scripts
- [ ] Add platform-specific builds
- [ ] Configure CI/CD
- [ ] Setup automated testing

### 2. Release Process
- [ ] Create release checklist
- [ ] Add version management
- [ ] Setup rollback procedures
- [ ] Configure monitoring

## Monitoring and Analytics

### 1. Error Tracking
- [ ] Setup error logging
- [ ] Add performance monitoring
- [ ] Configure alerts
- [ ] Create dashboards

### 2. Usage Analytics
- [ ] Add storage metrics
- [ ] Track migration success
- [ ] Monitor performance
- [ ] Collect user feedback

## Security Audit

### 1. Code Review
- [ ] Review encryption
- [ ] Check access controls
- [ ] Verify data handling
- [ ] Audit dependencies

### 2. Penetration Testing
- [ ] Test data access
- [ ] Verify encryption
- [ ] Check authentication
- [ ] Review permissions

## Success Criteria

### 1. Performance
- [ ] Query response time < 100ms
- [ ] Migration time < 5s per 1000 records
- [ ] Storage overhead < 10%
- [ ] Memory usage < 50MB
- [ ] Atomic operations complete successfully
- [ ] Transaction performance meets requirements

### 2. Reliability
- [ ] 99.9% uptime
- [ ] Zero data loss
- [ ] Automatic recovery
- [ ] Backup verification
- [ ] Transaction atomicity
- [ ] Data consistency

### 3. Security
- [ ] AES-256 encryption
- [ ] Secure key storage
- [ ] Access control
- [ ] Audit logging

### 4. User Experience
- [ ] Smooth migration
- [ ] Clear error messages
- [ ] Progress indicators
- [ ] Recovery options