Add Data Sync Plugin for External Database Replication

[Kunal-Darekar]

/Fixes #72
/claim #72

Overview

This PR adds a new Data Sync Plugin that enables StarbaseDB to replicate data from external databases to the internal SQLite database. The plugin provides a robust, configurable solution for keeping data synchronized across different database systems.

Features

• Automatic Synchronization: Periodically pulls data based on configurable intervals
• Multiple Database Support: Works with PostgreSQL, MySQL, MongoDB, Turso, and Cloudflare D1
• Incremental Updates: Only fetches new or updated records since the last sync
• Schema Detection: Automatically detects and creates matching table schemas
• Selective Sync: Configure which tables to synchronize
• Batch Processing: Processes data in configurable batch sizes
• Error Handling: Comprehensive error handling with detailed logging
• API Methods: Programmatic control for sync operations

Implementation Details

• Created a plugin architecture that integrates with StarbaseDB's core
• Implemented database adapters for different external sources
• Added metadata tracking for sync state management
• Built comprehensive test suite with mocked database connections
• Created detailed documentation with examples and troubleshooting guides

Files Added/Modified

• plugins/data_sync/index.ts - Main plugin implementation
• plugins/data_sync/index.test.ts - Test suite
• plugins/data_sync/readme.md - Documentation
• plugins/data_sync/demo/setup.sql - Demo database setup
• plugins/data_sync/demo/test.ts - Demo implementation
• plugins/data_sync/demo/wrangler.toml - Configuration example
• vitest.config.ts - Updated test configuration
• package.json - Added test script
• tsconfig.json - Updated TypeScript configuration

Testing

• Unit tests for all core functionality
• Integration tests with mocked database connections
• Manual testing with PostgreSQL database

Setup and Configuration

Prerequisites

• StarbaseDB instance
• External database (PostgreSQL, MySQL, MongoDB, etc.)

Installation Steps

1. Start a PostgreSQL instance:

   docker run --name postgres-db -e POSTGRES_PASSWORD=postgres -p 5432:5432 -d postgres

2. Configure the plugin in wrangler.toml:

   [plugins.data_sync]
   sync_interval = 5  # 5 minutes
   tables = ["users", "products", "orders"]
   batch_size = 100
   track_column = "created_at"
   enabled = true

3. Set up environment variables for database credentials:

   # PostgreSQL configuration
   EXTERNAL_DB_TYPE = "postgresql"
   EXTERNAL_DB_HOST = "localhost"
   EXTERNAL_DB_PORT = "5432"
   EXTERNAL_DB_USER = "postgres"
   EXTERNAL_DB_PASS = "postgres"
   EXTERNAL_DB_DATABASE = "starbase_demo"
   EXTERNAL_DB_DEFAULT_SCHEMA = "public"

4. Initialize test database:

   psql -U postgres -d postgres -c "CREATE DATABASE starbase_demo;"
   psql -U postgres -d starbase_demo -f plugins/data_sync/demo/setup.sql

5. Test synchronization:

   npm run test:data-sync

Documentation

• Added comprehensive readme with installation instructions
• Included configuration examples for all supported databases
• Added API documentation with examples
• Included troubleshooting section with common issues and solutions

Future Improvements

• Add support for more database types
• Implement two-way synchronization
• Add conflict resolution strategies
• Improve performance for large datasets