If the input data used to populate a storage is modified (e.g. the format of a CSV file column containing a date is modified), the types of this storage columns could be modified. And this could break your dashboards.
That's why we've added a new option in storages configuration : lock-model. When this option is enabled, any operation that drops a column or modifies the type of a column is refused. We advise you to activate this option in your production environment.