How to: Custom Validation & Protection Rules
The data you put into NetBox is crucial to network operations. In addition to its robust native validation rules, NetBox provides mechanisms for administrators to define their own custom validation rules for objects. Custom validation can be used both to ensure new or modified objects adhere to a set of rules, and to prevent the deletion of objects which don't meet certain criteria. (For example, you might want to prevent the deletion of a device with an "active" status.)