services/sync.rs - Offline Data Synchronization Service

Conceptual Overview

Manages offline data synchronization with conflict resolution, batch processing, and background sync operations. Ensures data consistency between local storage and backend systems.

Key Data Flows

• Queues responses for offline synchronization
• Performs batch uploads with error handling
• Handles remote updates and conflict resolution
• Manages persistent storage integration
• Supports background synchronization scheduling

Main Responsibilities

• Offline response queue management
• Batch synchronization with configurable sizes
• Conflict resolution for concurrent updates
• Background sync task coordination
• Storage integration for crash recovery
• Sync status and metrics tracking

Dependencies on Other Components

• models::* - Response and sync data models
• services::api::ApiClient - Backend communication
• services::storage::StorageService - Local persistence
• Tokio for async operations and timers

User-Facing Functionality

• Seamless offline learning capability
• Automatic background data synchronization
• Data consistency across devices
• Recovery from network interruptions
• Transparent sync status indicators