When you use Storages in a production environment, once your project is set up, it's important to lock the models of these Storages.
When a Storage model is locked, if an operation tries to modify a column's type (e.g. change its type from datetime to string), it will be refused. Let's imagine you import CSV files in your workflow, and one day, someone types the text "this date is missing" in a datetime column. If your models are not locked, this may break your dashboards.
With the new version, in the datasources list, a new icon shows if a Storage model is locked or not, so you can quickly check that all your production models are locked: