# Fragment: PostgresInstance CRD (excerpt)
                                        
                                        
                                            apiVersion: apiextensions.k8s.io/v1
                                        
                                        
                                            kind: CustomResourceDefinition
                                        
                                        
                                            metadata:
                                        
                                        
                                              name: postgresinstances.database.example
                                        
                                        
                                            spec:
                                        
                                        
                                              group: database.example
                                        
                                        
                                              names:
                                        
                                        
                                                kind: PostgresInstance
                                        
                                        
                                              versions:
                                        
                                        
                                              - name: v1
                                        
                                        
                                                schema:
                                        
                                        
                                                  openAPIV3Schema:
                                        
                                        
                                                    properties:
                                        
                                        
                                                      spec:
                                        
                                        
                                                        properties:
                                        
                                        
                                                          profile: enum[aws-secure, azure-secure, gcp-secure]
                                        
                                        
                                                          storageGiB: integer
                                        
                                        
                                                          highAvailability: boolean
                                        
                                        
                                            # Example resource
                                        
                                        
                                            apiVersion: database.example/v1
                                        
                                        
                                            kind: PostgresInstance
                                        
                                        
                                            metadata:
                                        
                                        
                                              name: app-prod
                                        
                                        
                                            spec:
                                        
                                        
                                              profile: aws-secure
                                        
                                        
                                            # $ kubectl apply -f crossplane/app-db.yaml
                                        
                                        
                                            # → Applied secure profile; docs + spec linked in fragment