Merge branch '75-add-support-postgresql'

Author: abdullahainun

CHANGELOG_v1.1.6.md

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+# 🚀 TenangDB v1.1.6 - Database Provider Foundation
+
+## 🎯 Overview
+
+v1.1.6 introduces a **database provider architecture** that prepares TenangDB for multi-database support while maintaining 100% backward compatibility with existing MySQL configurations. This release lays the foundation for PostgreSQL support in v1.2.0.
+
+## ✨ New Features
+
+### 🏗️ Database Provider Architecture
+- **Provider Interface** - Unified interface for all database types
+- **Factory Pattern** - Clean provider creation and management
+- **Multi-Database Configuration** - Support for database-specific settings
+- **Backward Compatibility** - Automatic migration of legacy MySQL configs
+
+### 🧙‍♂️ Enhanced Setup Wizard
+- **Database Type Selection** - Choose between MySQL and PostgreSQL (v1.2.0)
+- **Auto-Detection** - Automatically detect database type from port
+- **Smart Defaults** - Intelligent configuration based on database type
+- **Improved UX** - Cleaner, more intuitive setup process
+
+### 📦 New Components
+
+#### Database Providers (`pkg/database/`)
+- `Provider` interface - Universal database operations
+- `MySQLProvider` - Full MySQL implementation with existing features
+- `ProviderFactory` - Database provider creation and management
+- `SetupWizard` - Interactive multi-database configuration
+
+#### Configuration System
+- `ProviderConfig` - New multi-database configuration structure
+- `LegacyDatabaseConfig` - Backward compatibility support
+- `MigrateFromLegacyConfig()` - Automatic configuration migration
+
+#### Testing Framework
+- `provider_test.go` - Comprehensive provider testing
+- Configuration validation tests
+- Factory pattern tests
+- Migration testing
+
+## 🔄 Backward Compatibility
+
+### Automatic Migration
+Existing MySQL configurations are automatically migrated at runtime:
+
+```yaml
+# Legacy format (still works)
+database:
+  host: localhost
+  port: 3306
+  username: backup_user
+  password: secure_password
+```
+
+Becomes:
+```yaml
+# New format (auto-generated)
+database:
+  type: mysql
+  host: localhost
+  port: 3306
+  username: backup_user
+  password: secure_password
+  mysql:
+    use_mydumper: true
+    single_transaction: true
+```
+
+### Zero Breaking Changes
+- ✅ All existing configurations continue to work
+- ✅ CLI commands remain unchanged
+- ✅ Backup behavior is identical
+- ✅ No user action required
+
+## 🚀 What's Next (v1.2.0)
+
+### PostgreSQL Support
+- `PostgreSQLProvider` implementation
+- `pg_dump` and `psql` integration
+- Multiple backup formats (plain, custom, directory, tar)
+- Parallel backup support
+
+### Enhanced Features
+- Cross-database backup jobs
+- Database migration tools
+- Enhanced configuration validation
+- Multi-database monitoring
+
+## 🔧 Technical Details
+
+### Architecture Benefits
+1. **Extensibility** - Easy to add new database types
+2. **Maintainability** - Clean separation of database-specific logic
+3. **Testability** - Provider interface enables comprehensive testing
+4. **Performance** - Database-optimized backup strategies
+
+### Code Quality
+- **Interface-driven design** - Clean abstractions and contracts
+- **Factory pattern** - Centralized provider creation
+- **Comprehensive testing** - High test coverage for new components
+- **Documentation** - Detailed provider architecture guide
+
+## 📋 Files Changed
+
+### New Files
+- `pkg/database/provider.go` - Provider interface and types
+- `pkg/database/factory.go` - Provider factory implementation
+- `pkg/database/mysql_provider.go` - MySQL provider implementation
+- `pkg/database/setup_wizard.go` - Enhanced setup wizard
+- `pkg/database/provider_test.go` - Comprehensive tests
+- `docs/DATABASE_PROVIDERS.md` - Architecture documentation
+
+### Modified Files
+- Enhanced existing MySQL functionality integration
+- Improved CLI setup process
+- Updated documentation structure
+
+## 🎯 Migration Guide
+
+### For Existing Users
+**No action required!** Your existing configurations will continue to work exactly as before.
+
+### For New Features
+To take advantage of new features:
+
+1. **Run enhanced setup:**
+   ```bash
+   tenangdb init
+   ```
+
+2. **Choose database type** when prompted
+3. **Enjoy improved configuration experience**
+
+## 🧪 Testing
+
+```bash
+# Test the new provider architecture
+go test ./pkg/database/...
+
+# Test backward compatibility
+tenangdb init  # Try with existing config
+```
+
+## 📚 Documentation
+
+- **[Database Providers Architecture](docs/DATABASE_PROVIDERS.md)** - Complete guide
+- **[Configuration Reference](config.yaml.example)** - Updated examples
+- **[Migration Guide](docs/DATABASE_PROVIDERS.md#migration-guide)** - Detailed migration instructions
+
+---
+
+**🔗 Links:** [GitHub Release](https://github.com/abdullahainun/tenangdb/releases/tag/v1.1.6) • [Documentation](docs/DATABASE_PROVIDERS.md) • [Issues](https://github.com/abdullahainun/tenangdb/issues)
+
+This foundation release ensures TenangDB is ready for the multi-database future while maintaining the reliability and simplicity users expect! 🚀