Optimize auth for large datasets

**Feature request**
It would be great to have import for models.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_import` with default `false`.

The issue names no files, tests, or entry points. Start by locating the current authentication, model handling, and configuration code, then clarify what model import means and how large datasets are involved. Done should include a documented enable_import default of false and tests covering the intended import behavior.

Written by the indexing model from the issue text.