Refactor database to migration-only approach and add complete documentation
### Database Architecture Improvements:
- **Remove redundant schema files**: Eliminated duplicate table/index definitions
- **Single source of truth**: Migration files now exclusively define database schema
- **Simplified maintenance**: No more sync issues between schema files and migrations
### Files Removed:
- `database/schema/tables.ts` - Redundant table definitions
- `database/schema/indexes.ts` - Redundant index definitions
### Files Updated:
- `database/schema/index.ts` - Now only exports migration utilities
- `database/index.ts` - Simplified exports, removed redundant schema references
- `BaseService.ts` - Updated documentation for migration-only approach
- `migrator.ts` - Enhanced documentation and clarity
### Documentation Added:
- **`database/README.md`** - Comprehensive 400+ line guide covering:
- Architecture overview and migration-only approach
- Complete directory structure explanation
- Migration system lifecycle with diagrams
- Query organization and API reference
- Development workflow and best practices
- Troubleshooting guide and examples
### Benefits:
- ✅ Eliminated redundancy between schema and migration files
- ✅ Reduced maintenance overhead and potential sync issues
- ✅ Established single source of truth for database schema
- ✅ Added comprehensive documentation for team development
- ✅ Maintained full backward compatibility
- ✅ All tests continue to pass (1420/1420)
The database system now follows industry best practices with migrations as the sole
schema definition method, while providing complete documentation for developers.
Vaayne
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