Cấu trúc files sẽ tạo 1. Alembic Configuration backend/alembic.ini - Cấu hình Alembic backend/alembic/env.py - Environment setup cho Alembic backend/alembic/script.py.mako - Template cho migration files 2. Migration Management Scripts backend/scripts/migrate.py - Script quản lý migrations (create, apply, rollback) backend/scripts/create_migration.sh - Helper script tạo migration mới 3. Migration Templates backend/migrations/templates/add_column.sql - Template thêm column backend/migrations/te...