- Add missing created_at and updated_at columns to items table
- Update Item model to handle timestamp fields
- Fix ItemController to work with new database schema
- Resolves 500 Internal Server Error on /api/items endpoint
- Add DEVELOPMENT.md with complete LXC environment setup guide
- Implement dynamic category tree with item navigation in sidebar
- Add category detail view with items list via AJAX
- Add item edit form with delete functionality
- Enhance SPA routing to support query parameters for categories/items
- Update Bootstrap styling with icons and improved navigation
- Include SQLite database in repository for development
