Search Index recency ranker to use last-viewed-at (#50071)

src/metabase/models/dashboard.clj

@@ -672,6 +672,7 @@
                   :database-id    false
                   :last-editor-id :r.user_id
                   :last-edited-at :r.timestamp
+                  :last-viewed-at true
                   :pinned         [:> [:coalesce :collection_position [:inline 0]] [:inline 0]]
                   :view-count     true
                   :created-at     true

src/metabase/search/postgres/index.clj

@@ -53,6 +53,7 @@
              [:legacy_input :text :not-null]
              ;; scoring related
              [:dashboardcard_count :int]
+             [:last_viewed_at :timestamp]
              [:model_rank :int :not-null]
              [:official_collection :boolean]
              [:pinned :boolean]

src/metabase/search/postgres/scoring.clj

@@ -80,7 +80,7 @@
    :view-count (atan-size :view_count search.config/view-count-scaling)
    :pinned     (truthy :pinned)
    :bookmarked bookmark-score-expr
-   :recency    (inverse-duration :model_updated_at [:now] search.config/stale-time-in-days)
+   :recency    (inverse-duration [:coalesce :last_viewed_at :model_updated_at] [:now] search.config/stale-time-in-days)
    :dashboard  (size :dashboardcard_count search.config/dashboard-count-ceiling)
    :model      (idx-rank :model_rank (count search.config/all-models))})
 

src/metabase/search/spec.clj

@@ -38,6 +38,7 @@
          :name
          :official-collection
          :dashboardcard-count
+         :last-viewed-at
          :pinned
          :verified                                          ;;  in addition to being a filter, this is also a ranker
          :view-count