define annotations for delete protection

docs/reference/operator_parameters.md

@@ -200,6 +200,16 @@ configuration they are grouped under the `kubernetes` key.
   of a database created by the operator. If the annotation key is also provided
   by the database definition, the database definition value is used.
 
+* **delete_annotation_date_key**
+  key name for annotation that compares manifest value with current date in the
+  YYYY-MM-DD format. Allowed pattern: `'([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]'`.
+  The default is empty which also disables this delete protection check.
+
+* **delete_annotation_name_key**
+  key name for annotation that compares manifest value with Postgres cluster name.
+  Allowed pattern: `'([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]'`. The default is
+  empty which also disables this delete protection check.
+
 * **downscaler_annotations**
   An array of annotations that should be passed from Postgres CRD on to the
   statefulset and, if exists, to the connection pooler deployment as well.