docs(add): scheduled deletion concept

Author: nerda-codes

pages/secret-manager/concepts.mdx

@@ -7,7 +7,7 @@ content:
   paragraph: Discover essential concepts of Scaleway Secret Manager, including secret versioning, ephemeral policies, and path management.
 tags: secret-manager secret version
 dates:
-  validation: 2025-01-13
+  validation: 2025-03-19
 ---
 
 ## Disabling a version
@@ -109,6 +109,15 @@ Secret types refer to the different kinds of sensitive data you can store with S
 
 Upon secret creation, you must choose a secret type that will also be applied to the secret version. All the secret's subsequent versions must be of the same type.
 
+## Scheduled deletion
+
+Scheduled deletion lets you mark a secret and its versions for deletion ahead of time. Instead of immediate deletion, the secret enters a 7 day pending deletion period, during which you can still recover it. During this time, you can read secret versions but cannot edit, access, or delete them. After the retention period, the secret and all its versions are permanently deleted.
+
+Recovering your secrets is billed €0.01 per version associated with the secret.
+
+Ephemeral secrets are deleted immediately when scheduled for deletion.
+
+
 ## Tag
 
 Tags allow you to organize your secrets. This gives you the possibility of sorting and filtering your secrets in any organizational pattern of your choice, which in turn helps you arrange, control, and monitor your secrets.