Behavior: Persists a new content record using the provided content update model. On success, returns a 201 Created response with a location header pointing to the newly created content record.

Authorization: Requires authentication and the user must have write or higher permission to the content definition. Read-only and Guest permissions are insufficient.

Side Effects: Creates a new content record in the database. May trigger notifications depending on content definition configuration.

Error Scenarios: Returns 400 Bad Request if the content definition ID refers to asset metadata or assets, if the content definition is invalid, if the user lacks sufficient write permissions, or if the save operation fails.