# Storage Implementation Checklist

## Core Services

### 1. Platform Service Layer
- [x] Create base `PlatformService` interface
  - [x] Define platform capabilities
    - [x] File system access detection
    - [x] Camera availability
    - [x] Mobile platform detection
    - [x] iOS specific detection
    - [x] File download capability
    - [x] SQLite capabilities
  - [x] Add SQLite operations interface
    - [x] Database initialization
    - [x] Query execution
    - [x] Transaction management
    - [x] Prepared statements
    - [x] Database statistics
  - [x] Include platform detection
    - [x] Web platform detection
    - [x] Mobile platform detection
    - [x] Desktop platform detection
  - [x] Add file system operations
    - [x] File read operations
    - [x] File write operations
    - [x] File delete operations
    - [x] Directory listing

- [x] Implement platform-specific services
  - [x] `WebPlatformService`
    - [x] AbsurdSQL integration
      - [x] SQL.js initialization
      - [x] IndexedDB backend setup
      - [x] Virtual file system configuration
    - [x] Web Worker support
      - [x] Worker thread initialization
      - [x] Message passing
      - [x] Error handling
    - [x] IndexedDB backend
      - [x] Database creation
      - [x] Transaction handling
      - [x] Storage quota management (1GB limit)
    - [x] SharedArrayBuffer detection
      - [x] Feature detection
      - [x] Fallback handling
    - [x] File system operations (intentionally not supported)
      - [x] File read operations (not available in web)
      - [x] File write operations (not available in web)
      - [x] File delete operations (not available in web)
      - [x] Directory operations (not available in web)
    - [x] Settings implementation
      - [x] AbsurdSQL settings operations
        - [x] Worker-based settings updates
        - [x] IndexedDB transaction handling
        - [x] SharedArrayBuffer support
      - [x] Web-specific settings features
        - [x] Storage quota management
        - [x] Worker thread isolation
        - [x] Cross-origin settings
      - [x] Web performance optimizations
        - [x] Settings caching
        - [x] Batch updates
        - [x] Worker message optimization
    - [x] Account implementation
      - [x] Web-specific account handling
        - [x] Browser storage persistence
        - [x] Session management
        - [x] Cross-tab synchronization
      - [x] Web security features
        - [x] Origin isolation
        - [x] Worker thread security
        - [x] Storage access control
  - [x] `CapacitorPlatformService`
    - [x] Native SQLite integration
      - [x] Database connection
      - [x] Query execution
      - [x] Transaction handling
    - [x] Platform capabilities
      - [x] iOS detection
      - [x] Android detection
      - [x] Feature availability
    - [x] File system operations
      - [x] File read/write
      - [x] Directory operations
    - [x] Storage permissions
      - [x] iOS permissions
      - [x] Android permissions
      - [x] Permission request handling
    - [x] Settings implementation
      - [x] Native SQLite settings operations
        - [x] Platform-specific SQLite optimizations
        - [x] Native transaction handling
        - [x] Platform storage management
      - [x] Mobile-specific settings features
        - [x] Platform preferences sync
        - [x] Background state handling
      - [x] Mobile performance optimizations
        - [x] Native caching
        - [x] Battery-efficient updates
        - [x] Memory management
    - [x] Account implementation
      - [x] Mobile-specific account handling
        - [x] Platform storage integration
        - [x] Background state handling
      - [x] Mobile security features
        - [x] Platform sandboxing
        - [x] Storage access control
        - [x] App sandboxing
  - [ ] `ElectronPlatformService` (planned)
    - [ ] Node SQLite integration
      - [ ] Database connection
      - [ ] Query execution
      - [ ] Transaction handling
    - [ ] File system access
      - [ ] File read operations
      - [ ] File write operations
      - [ ] File delete operations
      - [ ] Directory operations
    - [ ] IPC communication
      - [ ] Main process communication
      - [ ] Renderer process handling
      - [ ] Message passing
    - [ ] Native features implementation
      - [ ] System dialogs
      - [ ] Native menus
      - [ ] System integration
    - [ ] Settings implementation
      - [ ] Node SQLite settings operations
        - [ ] Main process SQLite handling
        - [ ] IPC-based updates
        - [ ] File system persistence
      - [ ] Desktop-specific settings features
        - [ ] System preferences integration
        - [ ] Multi-window sync
        - [ ] Offline state handling
      - [ ] Desktop performance optimizations
        - [ ] Process-based caching
        - [ ] Window state management
        - [ ] Resource optimization
    - [ ] Account implementation
      - [ ] Desktop-specific account handling
        - [ ] System keychain integration
        - [ ] Native authentication
        - [ ] Process isolation
      - [ ] Desktop security features
        - [ ] Process sandboxing
        - [ ] IPC security
        - [ ] File system protection

### 2. SQLite Service Layer
- [x] Create base `BaseSQLiteService`
  - [x] Common SQLite operations
    - [x] Query execution
    - [x] Transaction management
    - [x] Prepared statements
    - [x] Database statistics
  - [x] Performance monitoring
    - [x] Query timing
    - [x] Memory usage
    - [x] Database size
    - [x] Statement caching
  - [x] Error handling
    - [x] Connection errors
    - [x] Query errors
    - [x] Transaction errors
    - [x] Resource errors
  - [x] Transaction support
    - [x] Begin transaction
    - [x] Commit transaction
    - [x] Rollback transaction
    - [x] Nested transactions

- [x] Implement platform-specific SQLite services
  - [x] `AbsurdSQLService`
    - [x] Web Worker initialization
      - [x] Worker creation
      - [x] Message handling
      - [x] Error propagation
    - [x] IndexedDB backend setup
      - [x] Database creation
      - [x] Transaction handling
      - [x] Storage management
    - [x] Prepared statements
      - [x] Statement preparation
      - [x] Parameter binding
      - [x] Statement caching
    - [x] Performance optimizations
      - [x] WAL mode
      - [x] Memory mapping
      - [x] Cache configuration
    - [x] WAL mode support
      - [x] Journal mode configuration
      - [x] Synchronization settings
      - [x] Checkpoint handling
    - [x] Memory-mapped I/O
      - [x] MMAP size configuration (30GB)
      - [x] Memory management
      - [x] Performance monitoring
  - [x] `CapacitorSQLiteService`
    - [x] Native SQLite connection
      - [x] Database initialization
      - [x] Connection management
      - [x] Error handling
    - [x] Basic platform features
      - [x] Query execution
      - [x] Transaction handling
      - [x] Statement management
    - [x] Error handling
      - [x] Connection errors
      - [x] Query errors
      - [x] Resource errors
    - [x] WAL mode support
      - [x] Journal mode
      - [x] Synchronization
      - [x] Checkpointing
    - [ ] SQLCipher integration (planned)
      - [ ] Encryption setup
      - [ ] Key management
      - [ ] Secure storage
  - [ ] `ElectronSQLiteService` (planned)
    - [ ] Node SQLite integration
      - [ ] Database connection
      - [ ] Query execution
      - [ ] Transaction handling
    - [ ] IPC communication
      - [ ] Process communication
      - [ ] Error handling
      - [ ] Resource management
    - [ ] File system access
      - [ ] Native file operations
      - [ ] Path handling
      - [ ] Permissions
    - [ ] Native features
      - [ ] System integration
      - [ ] Native dialogs
      - [ ] Process management

### 3. Security Layer
- [x] Implement platform-specific security
  - [x] Web platform
    - [x] Worker isolation
      - [x] Thread separation
      - [x] Message security
      - [x] Resource isolation
    - [x] Storage quota management
      - [x] Quota detection
      - [x] Usage monitoring
      - [x] Error handling
    - [x] Origin isolation
      - [x] Cross-origin protection
      - [x] Resource isolation
      - [x] Security policy
    - [x] Storage security
      - [x] Access control
      - [x] Data protection
      - [x] Quota management
  - [x] Mobile platform
    - [x] Platform permissions
      - [x] Storage access
      - [x] File operations
      - [x] System integration
    - [x] Platform security
      - [x] App sandboxing
      - [x] Storage protection
      - [x] Access control
    - [ ] SQLCipher integration (planned)
      - [ ] Encryption setup
      - [ ] Key management
      - [ ] Secure storage
  - [ ] Electron platform (planned)
    - [ ] IPC security
      - [ ] Message validation
      - [ ] Process isolation
      - [ ] Resource protection
    - [ ] File system security
      - [ ] Access control
      - [ ] Path validation
      - [ ] Permission management
    - [ ] Auto-update security
      - [ ] Update verification
      - [ ] Code signing
      - [ ] Rollback protection
    - [ ] Native security features
      - [ ] System integration
      - [ ] Security policies
      - [ ] Resource protection

## Platform-Specific Implementation

### Web Platform
- [x] Setup absurd-sql
  - [x] Install dependencies
    ```json
    {
      "@jlongster/sql.js": "^1.8.0",
      "absurd-sql": "^1.8.0"
    }
    ```
  - [x] Configure Web Worker
    - [x] Worker initialization
    - [x] Message handling
    - [x] Error propagation
  - [x] Setup IndexedDB backend
    - [x] Database creation
    - [x] Transaction handling
    - [x] Storage management
  - [x] Configure database pragmas
    ```sql
    PRAGMA journal_mode = WAL;
    PRAGMA synchronous = NORMAL;
    PRAGMA temp_store = MEMORY;
    PRAGMA cache_size = -2000;
    PRAGMA mmap_size = 30000000000;
    ```

- [x] Update build configuration
  - [x] Configure worker bundling
    - [x] Worker file handling
    - [x] Asset management
    - [x] Source maps
  - [x] Setup asset handling
    - [x] SQL.js WASM
    - [x] Worker scripts
    - [x] Static assets
  - [x] Configure chunk splitting
    - [x] Code splitting
    - [x] Dynamic imports
    - [x] Asset optimization

- [x] Implement fallback mechanisms
  - [x] SharedArrayBuffer detection
    - [x] Feature detection
    - [x] Fallback handling
    - [x] Error reporting
  - [x] Storage quota monitoring
    - [x] Quota detection
    - [x] Usage tracking
    - [x] Error handling
  - [x] Worker initialization fallback
    - [x] Fallback detection
    - [x] Alternative initialization
    - [x] Error recovery
  - [x] Error recovery
    - [x] Connection recovery
    - [x] Transaction rollback
    - [x] State restoration

### Mobile Platform
- [x] Setup Capacitor SQLite
  - [x] Install dependencies
    - [x] Core SQLite plugin
    - [x] Platform plugins
    - [x] Native dependencies
  - [x] Configure native SQLite
    - [x] Database initialization
    - [x] Connection management
    - [x] Query handling
  - [x] Configure basic permissions
    - [x] Storage access
    - [x] File operations
    - [x] System integration

- [x] Update Capacitor config
  - [x] Add basic platform permissions
    - [x] iOS permissions
    - [x] Android permissions
    - [x] Feature flags
  - [x] Configure storage limits
    - [x] iOS storage limits
    - [x] Android storage limits
    - [x] Quota management
  - [x] Setup platform security
    - [x] App sandboxing
    - [x] Storage protection
    - [x] Access control

### Electron Platform (planned)
- [ ] Setup Node SQLite
  - [ ] Install dependencies
    - [ ] SQLite3 module
    - [ ] Native bindings
    - [ ] Development tools
  - [ ] Configure IPC
    - [ ] Main process setup
    - [ ] Renderer process handling
    - [ ] Message passing
  - [ ] Setup file system access
    - [ ] Native file operations
    - [ ] Path handling
    - [ ] Permission management
  - [ ] Implement secure storage
    - [ ] Encryption setup
    - [ ] Key management
    - [ ] Secure containers

- [ ] Update Electron config
  - [ ] Add security policies
    - [ ] CSP configuration
    - [ ] Process isolation
    - [ ] Resource protection
  - [ ] Configure file access
    - [ ] Access control
    - [ ] Path validation
    - [ ] Permission management
  - [ ] Setup auto-updates
    - [ ] Update server
    - [ ] Code signing
    - [ ] Rollback protection
  - [ ] Configure IPC security
    - [ ] Message validation
    - [ ] Process isolation
    - [ ] Resource protection

## Data Models and Types

### 1. Database Schema
- [x] 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);
  ```

### 2. Type Definitions
- [x] Create interfaces
  ```typescript
  interface PlatformCapabilities {
    hasFileSystem: boolean;
    hasCamera: boolean;
    isMobile: boolean;
    isIOS: boolean;
    hasFileDownload: boolean;
    needsFileHandlingInstructions: boolean;
    sqlite: {
      supported: boolean;
      runsInWorker: boolean;
      hasSharedArrayBuffer: boolean;
      supportsWAL: boolean;
      maxSize?: number;
    };
  }

  interface SQLiteConfig {
    name: string;
    useWAL?: boolean;
    useMMap?: boolean;
    mmapSize?: number;
    usePreparedStatements?: boolean;
    maxPreparedStatements?: number;
  }

  interface SQLiteStats {
    totalQueries: number;
    avgExecutionTime: number;
    preparedStatements: number;
    databaseSize: number;
    walMode: boolean;
    mmapActive: boolean;
  }
  ```

## Testing

### 1. Unit Tests
- [x] Test platform services
  - [x] Platform detection
    - [x] Web platform
    - [x] Mobile platform
    - [x] Desktop platform
  - [x] Capability reporting
    - [x] Feature detection
    - [x] Platform specifics
    - [x] Error cases
  - [x] Basic SQLite operations
    - [x] Query execution
    - [x] Transaction handling
    - [x] Error cases
  - [x] Basic error handling
    - [x] Connection errors
    - [x] Query errors
    - [x] Resource errors

### 2. Integration Tests
- [x] Test SQLite services
  - [x] Web platform tests
    - [x] Worker integration
    - [x] IndexedDB backend
    - [x] Performance tests
  - [x] Basic mobile platform tests
    - [x] Native SQLite
    - [x] Platform features
    - [x] Error handling
  - [ ] Electron platform tests (planned)
    - [ ] Node SQLite
    - [ ] IPC communication
    - [ ] File system
  - [x] Cross-platform tests
    - [x] Feature parity
    - [x] Data consistency
    - [x] Performance comparison

### 3. E2E Tests
- [x] Test workflows
  - [x] Basic database operations
    - [x] CRUD operations
    - [x] Transaction handling
    - [x] Error recovery
  - [x] Platform transitions
    - [x] Web to mobile
    - [x] Mobile to web
    - [x] State preservation
  - [x] Basic error recovery
    - [x] Connection loss
    - [x] Transaction failure
    - [x] Resource errors
  - [x] Performance benchmarks
    - [x] Query performance
    - [x] Transaction speed
    - [x] Memory usage
    - [x] Storage efficiency

## Documentation

### 1. Technical Documentation
- [x] Update architecture docs
  - [x] System overview
  - [x] Component interaction
  - [x] Platform specifics
- [x] Add basic API documentation
  - [x] Interface definitions
  - [x] Method signatures
  - [x] Usage examples
- [x] Document platform capabilities
  - [x] Feature matrix
  - [x] Platform support
  - [x] Limitations
- [x] Document security measures
  - [x] Platform security
  - [x] Access control
  - [x] Security policies

### 2. User Documentation
- [x] Update basic user guides
  - [x] Installation
  - [x] Configuration
  - [x] Basic usage
- [x] Add basic troubleshooting guides
  - [x] Common issues
  - [x] Error messages
  - [x] Recovery steps
- [x] Document implemented platform features
  - [x] Web platform
  - [x] Mobile platform
  - [x] Desktop platform
- [x] Add basic performance tips
  - [x] Optimization techniques
  - [x] Best practices
  - [x] Platform specifics

## Monitoring and Analytics

### 1. Performance Monitoring
- [x] Basic query execution time
  - [x] Query timing
  - [x] Transaction timing
  - [x] Statement timing
- [x] Database size monitoring
  - [x] Size tracking
  - [x] Growth patterns
  - [x] Quota management
- [x] Basic memory usage
  - [x] Heap usage
  - [x] Cache usage
  - [x] Worker memory
- [x] Worker performance
  - [x] Message timing
  - [x] Processing time
  - [x] Resource usage

### 2. Error Tracking
- [x] Basic error logging
  - [x] Error capture
  - [x] Stack traces
  - [x] Context data
- [x] Basic performance monitoring
  - [x] Query metrics
  - [x] Resource usage
  - [x] Timing data
- [x] Platform-specific errors
  - [x] Web platform
  - [x] Mobile platform
  - [x] Desktop platform
- [x] Basic recovery tracking
  - [x] Recovery success
  - [x] Failure patterns
  - [x] User impact

## Security Audit

### 1. Code Review
- [x] Review platform services
  - [x] Interface security
  - [x] Data handling
  - [x] Error management
- [x] Check basic SQLite implementations
  - [x] Query security
  - [x] Transaction safety
  - [x] Resource management
- [x] Verify basic error handling
  - [x] Error propagation
  - [x] Recovery procedures
  - [x] User feedback
- [x] Complete dependency audit
  - [x] Security vulnerabilities
  - [x] License compliance
  - [x] Update requirements

### 2. Platform Security
- [x] Web platform
  - [x] Worker isolation
    - [x] Thread separation
    - [x] Message security
    - [x] Resource isolation
  - [x] Basic storage security
    - [x] Access control
    - [x] Data protection
    - [x] Quota management
  - [x] Origin isolation
    - [x] Cross-origin protection
    - [x] Resource isolation
    - [x] Security policy
- [x] Mobile platform
  - [x] Platform permissions
    - [x] Storage access
    - [x] File operations
    - [x] System integration
  - [x] Platform security
    - [x] App sandboxing
    - [x] Storage protection
    - [x] Access control
  - [ ] SQLCipher integration (planned)
    - [ ] Encryption setup
    - [ ] Key management
    - [ ] Secure storage
- [ ] Electron platform (planned)
  - [ ] IPC security
    - [ ] Message validation
    - [ ] Process isolation
    - [ ] Resource protection
  - [ ] File system security
    - [ ] Access control
    - [ ] Path validation
    - [ ] Permission management
  - [ ] Auto-update security
    - [ ] Update verification
    - [ ] Code signing
    - [ ] Rollback protection

## Success Criteria

### 1. Performance
- [x] Basic query response time < 100ms
  - [x] Simple queries
  - [x] Indexed queries
  - [x] Prepared statements
- [x] Basic transaction completion < 500ms
  - [x] Single operations
  - [x] Batch operations
  - [x] Complex transactions
- [x] Basic memory usage < 50MB
  - [x] Normal operation
  - [x] Peak usage
  - [x] Background state
- [x] Database size < platform limits
  - [x] Web platform (1GB)
  - [x] Mobile platform (2GB)
  - [ ] Desktop platform (10GB, planned)

### 2. Reliability
- [x] Basic uptime
  - [x] Service availability
  - [x] Connection stability
  - [x] Error recovery
- [x] Basic data integrity
  - [x] Transaction atomicity
  - [x] Data consistency
  - [x] Error handling
- [x] Basic recovery
  - [x] Connection recovery
  - [x] Transaction rollback
  - [x] State restoration
- [x] Basic transaction atomicity
  - [x] Commit success
  - [x] Rollback handling
  - [x] Error recovery

### 3. Security
- [x] Platform-specific security
  - [x] Web platform security
  - [x] Mobile platform security
  - [ ] Desktop platform security (planned)
- [x] Basic access control
  - [x] User permissions
  - [x] Resource access
  - [x] Operation limits
- [x] Basic audit logging
  - [x] Access logs
  - [x] Operation logs
  - [x] Security events
- [ ] Advanced security features (planned)
  - [ ] SQLCipher encryption
  - [ ] Biometric authentication
  - [ ] Secure enclave
  - [ ] Key management

### 4. User Experience
- [x] Basic platform transitions
  - [x] Web to mobile
  - [x] Mobile to web
  - [x] State preservation
- [x] Basic error messages
  - [x] User feedback
  - [x] Recovery guidance
  - [x] Error context
- [x] Basic progress indicators
  - [x] Operation status
  - [x] Loading states
  - [x] Completion feedback
- [x] Basic recovery options
  - [x] Automatic recovery
  - [x] Manual intervention
  - [x] Data restoration