Storage: Add mode 2 dual writing improvements (#87204)

* Fix mode 2 List test
* Set origin timestamp during conversion to k8s resource
* Add instructions for updating a playlist
* Handle partial deletions of a collection in mode 2

pkg/registry/apis/playlist/conversions.go

@@ -91,9 +91,11 @@ func convertToK8sResource(v *playlistsvc.PlaylistDTO, namespacer request.Namespa
 	if err == nil {
 		meta.SetUpdatedTimestampMillis(v.UpdatedAt)
 		if v.Id > 0 {
+			createdAt := time.UnixMilli(v.CreatedAt)
 			meta.SetOriginInfo(&utils.ResourceOriginInfo{
-				Name: "SQL",
-				Key:  fmt.Sprintf("%d", v.Id),
+				Name:      "SQL",
+				Key:       fmt.Sprintf("%d", v.Id),
+				Timestamp: &createdAt,
 			})
 		}
 	}

pkg/registry/apis/playlist/conversions_test.go

@@ -44,6 +44,7 @@ func TestPlaylistConversion(t *testing.T) {
 		  "annotations": {
 			"grafana.app/originKey": "123",
 			"grafana.app/originName": "SQL",
+			"grafana.app/originTimestamp":"1970-01-01T00:00:12Z",
 			"grafana.app/updatedTimestamp": "1970-01-01T00:00:54Z"
 		  }
 		},