* feat: Add automatic database migration system for agents service
- Add migrations tracking schema with version, tag, and timestamp
- Implement MigrationService to automatically run pending migrations
- Integrate migration check into BaseService initialization
- Read migration files from drizzle/ directory and journal.json
- Track applied migrations to prevent re-execution
- Ensure database is always at latest version on service startup
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via [Happy](https://happy.engineering)
Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>
* refactor: Improve migration logging and enhance database path configuration
* chore: harden migration bootstrap flow
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Happy <yesreply@happy.engineering>
- Replace custom migration system with modern Drizzle ORM implementation
- Add drizzle-orm and drizzle-kit dependencies for type-safe database operations
- Refactor BaseService to use Drizzle client with full type safety
- Create schema definitions in /database/schema/ using Drizzle patterns
- Remove legacy migration files, queries, and migrator classes
- Add comprehensive documentation for new Drizzle-based architecture
- Maintain backward compatibility in service layer APIs
- Simplify database operations with modern ORM patterns
This migration eliminates custom SQL generation in favor of a proven,
type-safe ORM solution that provides better developer experience and
maintainability.
