Update helpers documentation

**Feature request**
It would be great to have encryption for utils.

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

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

Start by locating the helpers or utils implementation and the configuration handling mentioned in the issue. Clarify which data encryption should cover and how the new option is expected to behave before making changes. Done should include a documented `enable_encryption` option whose default is `false`, with tests or verification for the configured behavior.

Written by the indexing model from the issue text.