update Subgraph Studio archive policy (#684)

* add Timestamp scalar

* update Subgraph Studio archive policy

* fix style with prettier

* fix requested changes

* remove special case chains and removed ar change

---------

Co-authored-by: azf20 <[email protected]>

Author: yash251

website/pages/en/deploying/deploying-a-subgraph-to-hosted.mdx

@@ -284,8 +284,12 @@ Developers will be notified by email if one of their subgraphs has been marked a
 
 ## Subgraph Studio subgraph archive policy
 
-When a new version of a subgraph is deployed, the previous version is archived (deleted from the graph-node DB). This only happens if the previous version is not published to The Graph's decentralized network.
+A subgraph version in Studio is archived if and only if it meets the following criteria:
 
-When a subgraph version isn’t queried for over 45 days, that version is archived.
+- The version is not published to the network (or pending publish)
+- The version was created 45 or more days ago
+- The subgraph hasn't been queried in 30 days
+
+In addition, when a new version is deployed, if the subgraph has not been published, then the N-2 version of the subgraph is archived.
 
 Every subgraph affected with this policy has an option to bring the version in question back.