🔧 TASK-007.1.1 - Implement Database Schema (3 Subtasks)

# TASK-007.1.1 - Implement Database Schema

**Parent Task:** TASK-007.1 - Database Infrastructure  
**Total Duration:** 3 days  
**Priority:** Critical  
**Status:** Ready to start  
**Dependencies:** ✅ TASK-007.0.3 (Production Environment completed)

## 📋 Overview

Implement comprehensive database schema with all required tables, indexes, and constraints for handheld integration. This task has been broken down into 3 focused subtasks for better implementation and testing.

## 🔧 Subtask Breakdown

### **TASK-007.1.1.1: Core User & Authentication Schema** 📅 Day 1

**Duration:** 1 day  
**Priority:** Critical  
**Dependencies:** TASK-007.0.3 (Production Environment completed)

**Description:**
Implement the foundational user management and authentication schema that supports cross-device authentication and user preferences.

**Scope:**
- Users table with authentication fields
- Device registration and management
- User preferences and security settings
- Session management tables
- Authentication tokens and refresh tokens

**Key Tables:**
```sql
-- Users and Authentication
CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    display_name VARCHAR(100),
    preferences JSONB DEFAULT '{}',
    security_settings JSONB DEFAULT '{}',
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),
    last_login TIMESTAMP,
    status VARCHAR(20) DEFAULT 'active'
);

-- Device Management
CREATE TABLE devices (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    device_name VARCHAR(100) NOT NULL,
    device_type VARCHAR(50) NOT NULL,
    platform VARCHAR(50),
    capabilities JSONB DEFAULT '{}',
    last_seen TIMESTAMP DEFAULT NOW(),
    created_at TIMESTAMP DEFAULT NOW(),
    status VARCHAR(20) DEFAULT 'active'
);

-- Session Management
CREATE TABLE sessions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    device_id UUID REFERENCES devices(id) ON DELETE CASCADE,
    session_token VARCHAR(255) UNIQUE NOT NULL,
    refresh_token VARCHAR(255) UNIQUE,
    expires_at TIMESTAMP NOT NULL,
    created_at TIMESTAMP DEFAULT NOW(),
    last_activity TIMESTAMP DEFAULT NOW()
);
```

**Acceptance Criteria:**
- [ ] User authentication schema implemented
- [ ] Device registration tables created
- [ ] Session management with proper expiration
- [ ] Proper indexes for authentication queries
- [ ] Foreign key constraints properly set

---

### **TASK-007.1.1.2: Conversation & Message Schema** 📅 Day 2

**Duration:** 1 day  
**Priority:** Critical  
**Dependencies:** TASK-007.1.1.1

**Description:**
Implement the conversation and message storage schema that supports real-time synchronization and message history across devices.

**Scope:**
- Conversations table with workspace integration
- Messages table with JSONB content storage
- Message threading and parent-child relationships
- Message metadata and device tracking
- Optimized indexes for message retrieval

**Key Tables:**
```sql
-- Conversations
CREATE TABLE conversations (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    title VARCHAR(200),
    workspace_path VARCHAR(500),
    metadata JSONB DEFAULT '{}',
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),
    last_activity TIMESTAMP DEFAULT NOW()
);

-- Messages
CREATE TABLE messages (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    conversation_id UUID REFERENCES conversations(id) ON DELETE CASCADE,
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    device_id UUID REFERENCES devices(id) ON DELETE SET NULL,
    message_type VARCHAR(50) NOT NULL,
    content JSONB NOT NULL,
    metadata JSONB DEFAULT '{}',
    parent_message_id UUID REFERENCES messages(id),
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW()
);

-- Message Change Tracking
CREATE TABLE message_changes (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    message_id UUID REFERENCES messages(id) ON DELETE CASCADE,
    change_type VARCHAR(20) NOT NULL,
    change_data JSONB NOT NULL,
    device_id UUID REFERENCES devices(id),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    timestamp TIMESTAMP DEFAULT NOW(),
    sync_status VARCHAR(20) DEFAULT 'pending',
    conflict_id UUID
);
```

**Acceptance Criteria:**
- [ ] Conversation management schema implemented
- [ ] Message storage with JSONB content
- [ ] Message threading support
- [ ] Change tracking for synchronization
- [ ] Performance indexes for message queries

---

### **TASK-007.1.1.3: File Sync & Workspace Schema** 📅 Day 3

**Duration:** 1 day  
**Priority:** High  
**Dependencies:** TASK-007.1.1.2

**Description:**
Implement file synchronization and workspace management schema that supports cross-device file sync with conflict resolution.

**Scope:**
- File synchronization state tracking
- Workspace management and settings
- File change detection and versioning
- Sync operations and conflict resolution
- Offline operations queue

**Key Tables:**
```sql
-- Workspaces
CREATE TABLE workspaces (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    name VARCHAR(200) NOT NULL,
    path VARCHAR(1000) NOT NULL,
    settings JSONB DEFAULT '{}',
    last_accessed TIMESTAMP DEFAULT NOW(),
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),
    UNIQUE(user_id, path)
);

-- File Sync State
CREATE TABLE file_sync_state (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    workspace_id UUID REFERENCES workspaces(id) ON DELETE CASCADE,
    file_path VARCHAR(1000) NOT NULL,
    file_hash VARCHAR(64) NOT NULL,
    file_size BIGINT,
    last_modified TIMESTAMP NOT NULL,
    sync_status VARCHAR(20) DEFAULT 'synced',
    conflict_resolution VARCHAR(20),
    metadata JSONB DEFAULT '{}',
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW(),
    UNIQUE(user_id, workspace_id, file_path)
);

-- Sync Operations
CREATE TABLE sync_operations (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    device_id UUID REFERENCES devices(id) ON DELETE SET NULL,
    operation_type VARCHAR(50) NOT NULL,
    resource_type VARCHAR(50) NOT NULL,
    resource_id VARCHAR(100) NOT NULL,
    operation_data JSONB NOT NULL,
    status VARCHAR(20) DEFAULT 'pending',
    conflict_data JSONB,
    created_at TIMESTAMP DEFAULT NOW(),
    completed_at TIMESTAMP
);

-- Offline Operations Queue
CREATE TABLE offline_operations (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    device_id UUID REFERENCES devices(id) ON DELETE CASCADE,
    operation_type VARCHAR(50) NOT NULL,
    operation_data JSONB NOT NULL,
    created_at TIMESTAMP DEFAULT NOW(),
    retry_count INTEGER DEFAULT 0,
    max_retries INTEGER DEFAULT 3,
    status VARCHAR(20) DEFAULT 'pending',
    error_message TEXT
);
```

**Acceptance Criteria:**
- [ ] File synchronization schema implemented
- [ ] Workspace management tables created
- [ ] Sync operations tracking
- [ ] Offline operations queue
- [ ] Conflict resolution support

## 📊 Performance Considerations

### **Indexing Strategy**
```sql
-- User and Authentication Indexes
CREATE INDEX idx_users_email ON users(email);
CREATE INDEX idx_users_status ON users(status);
CREATE INDEX idx_devices_user_id ON devices(user_id);
CREATE INDEX idx_sessions_user_device ON sessions(user_id, device_id);
CREATE INDEX idx_sessions_token ON sessions(session_token);

-- Message and Conversation Indexes
CREATE INDEX idx_conversations_user_id ON conversations(user_id);
CREATE INDEX idx_conversations_last_activity ON conversations(last_activity DESC);
CREATE INDEX idx_messages_conversation_created ON messages(conversation_id, created_at DESC);
CREATE INDEX idx_messages_user_created ON messages(user_id, created_at DESC);
CREATE INDEX idx_message_changes_user_status ON message_changes(user_id, sync_status, timestamp);

-- File Sync Indexes
CREATE INDEX idx_workspaces_user_id ON workspaces(user_id);
CREATE INDEX idx_file_sync_user_workspace ON file_sync_state(user_id, workspace_id);
CREATE INDEX idx_file_sync_status ON file_sync_state(sync_status, updated_at);
CREATE INDEX idx_sync_ops_user_status ON sync_operations(user_id, status, created_at);
CREATE INDEX idx_offline_ops_device_status ON offline_operations(device_id, status, created_at);
```

### **JSONB Optimization**
```sql
-- JSONB indexes for frequently queried fields
CREATE INDEX idx_users_preferences_gin ON users USING GIN (preferences);
CREATE INDEX idx_messages_content_gin ON messages USING GIN (content);
CREATE INDEX idx_messages_metadata_gin ON messages USING GIN (metadata);
CREATE INDEX idx_file_sync_metadata_gin ON file_sync_state USING GIN (metadata);
```

## 🧪 Testing Strategy

### **Data Integrity Testing**
- Foreign key constraint validation
- Unique constraint testing
- JSONB field validation
- Cascade delete behavior

### **Performance Testing**
- Index effectiveness validation
- Query performance benchmarking
- Large dataset handling
- Concurrent access testing

### **Migration Testing**
- Schema migration validation
- Data migration testing
- Rollback procedure testing
- Version compatibility

## 📋 Implementation Order

1. **Day 1:** TASK-007.1.1.1 - Core User & Authentication Schema
   - Implement user management tables
   - Add device registration schema
   - Create session management
   - Add authentication indexes

2. **Day 2:** TASK-007.1.1.2 - Conversation & Message Schema
   - Implement conversation tables
   - Add message storage schema
   - Create change tracking
   - Add message indexes

3. **Day 3:** TASK-007.1.1.3 - File Sync & Workspace Schema
   - Implement workspace management
   - Add file sync schema
   - Create sync operations tracking
   - Add performance indexes

## 🔄 Integration Points

### **With Previous Tasks**
- **TASK-007.0.3**: Uses production Docker infrastructure
- **TASK-006**: Integrates with authentication requirements
- **TASK-005**: Supports real-time communication needs

### **With Future Tasks**
- **TASK-007.1.2**: Provides foundation for migration system
- **TASK-007.1.3**: Enables connection pooling optimization
- **TASK-007.2**: Supports synchronization engine implementation

## 📈 Success Metrics

- **Schema Completeness**: All required tables implemented
- **Performance**: <100ms for typical queries
- **Data Integrity**: 100% constraint validation
- **Index Effectiveness**: >90% index usage for queries
- **Migration Success**: Zero data loss during deployment

## 🎯 Next Steps After Completion

1. **TASK-007.1.2**: Create Migration System
2. **TASK-007.1.3**: Set Up Connection Pooling
3. **TASK-007.2.1**: Implement Message History Sync
4. **Integration Testing**: Validate with existing CCS components

## 📁 Related Files

- [Database Schema Breakdown](docs/tasks/TASK_007_1_1_DATABASE_SCHEMA_BREAKDOWN.md)
- [Production Docker Infrastructure](docker/production/)
- [Database Migrations](docker/shared/database/migrations/)
- [Database Service](production-ccs/src/services/database.ts)

---

**Breakdown Created:** 2025-06-23  
**Total Estimated Duration:** 3 days (unchanged)  
**Subtasks:** 3 focused implementation tasks  
**Ready for:** Immediate implementation after TASK-007.0.3 completion

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🔧 TASK-007.1.1 - Implement Database Schema (3 Subtasks) #21

TASK-007.1.1 - Implement Database Schema

📋 Overview

🔧 Subtask Breakdown

TASK-007.1.1.1: Core User & Authentication Schema 📅 Day 1

TASK-007.1.1.2: Conversation & Message Schema 📅 Day 2

TASK-007.1.1.3: File Sync & Workspace Schema 📅 Day 3

📊 Performance Considerations

Indexing Strategy

JSONB Optimization

🧪 Testing Strategy

Data Integrity Testing

Performance Testing

Migration Testing

📋 Implementation Order

🔄 Integration Points

With Previous Tasks

With Future Tasks

📈 Success Metrics

🎯 Next Steps After Completion

📁 Related Files

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

🔧 TASK-007.1.1 - Implement Database Schema (3 Subtasks) #21

Description

TASK-007.1.1 - Implement Database Schema

📋 Overview

🔧 Subtask Breakdown

TASK-007.1.1.1: Core User & Authentication Schema 📅 Day 1

TASK-007.1.1.2: Conversation & Message Schema 📅 Day 2

TASK-007.1.1.3: File Sync & Workspace Schema 📅 Day 3

📊 Performance Considerations

Indexing Strategy

JSONB Optimization

🧪 Testing Strategy

Data Integrity Testing

Performance Testing

Migration Testing

📋 Implementation Order

🔄 Integration Points

With Previous Tasks

With Future Tasks

📈 Success Metrics

🎯 Next Steps After Completion

📁 Related Files

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions