Update the schema to remove any references to the relation from other permissions
If there are any issues discovered via testing at this point, the data is all still there and permissions can be restored by reverting the change to the schema.
You can stay at step 2 for as long as desired, in production, to retain your ability to roll back the change.
**If no issues are found, remove all existing relationships for that relation with authzed.api.v1.DeleteRelationships**
Update the schema to remove the relation from the definition