Sadly due to the nature of the migration from links to graph store, it was not technically feasible to do a seamless migration. Instead, the latest OTA has moved all the link collections into graph-store, as archived graphs. As links now uses a client-server topology, groups should decide amongst themselves who should host the link collections, in order to prevent everybody hosting a different copy. If you would like to host a publically accessible link collection that you were in prior to the OTA, then you must do the following.
In the dojo, run
:graph-store +dbug [%state '~(key by archive)']
> {[entity=~nus name=%posts-853] [entity=~nus name=%music-384]}
Look for the collection that you wish to host and make a note of its identifier. In this example I will use [~nus %music-384]
In the dojo, run
:group-store +dbug [%state '~(key by groups)']
{[entity=~bitbet-bolbel %urbit-community]}
Next, run the restore thread in the dojo with the resource and groups identifier
-graph-restore [~nus %music-384] 'title' 'description' [~bitbet-bolbel %urbit-community] 'link'
Update... that did eventually work and the link collection became available. I can see it now.
Is there a way to remove from the archive collections you know are dead?