diff --git a/app/models/card.rb b/app/models/card.rb
index e2191aa41..4c17269c9 100644
--- a/app/models/card.rb
+++ b/app/models/card.rb
@@ -1,6 +1,6 @@
 class Card < ApplicationRecord
   include Assignable, Colored, DraftCommenting, Engageable, Eventable, Golden,
-    Messages, Notifiable, Pinnable, Closeable, Scorable, Searchable, Staged,
+    Messages, Notifiable, Pinnable, Closeable, Searchable, Staged,
     Statuses, Taggable, Watchable
 
   belongs_to :collection, touch: true
@@ -21,12 +21,11 @@ class Card < ApplicationRecord
 
   scope :indexed_by, ->(index) do
     case index
-    when "most_active"    then ordered_by_activity
-    when "newest"         then reverse_chronologically
-    when "oldest"         then chronologically
-    when "latest"         then latest
-    when "stalled"        then ordered_by_staleness
-    when "closed"         then closed
+    when "newest"  then reverse_chronologically
+    when "oldest"  then chronologically
+    when "latest"  then latest
+    when "stalled" then chronologically
+    when "closed"  then closed
     end
   end
 
diff --git a/app/models/card/scorable.rb b/app/models/card/scorable.rb
deleted file mode 100644
index 91b0856b5..000000000
--- a/app/models/card/scorable.rb
+++ /dev/null
@@ -1,64 +0,0 @@
-module Card::Scorable
-  extend ActiveSupport::Concern
-
-  REFERENCE_DATE = Time.utc(2025, 1, 1)
-
-  included do
-    scope :ordered_by_activity, -> { order activity_score_order: :desc }
-
-    # Staleness is measured by the amount of activity_score lost since it was last updated.
-    # The factor 0.9 is chosen to make the decay curve closer to linear; an exponential
-    # curve would make recent items appear stale very quickly, due to the sharp dropoff.
-    scope :ordered_by_staleness, -> { order Arel.sql(
-      "coalesce(activity_score * (1 - power(0.9, julianday('now') - julianday(activity_score_at))), 0) desc"
-    ) }
-  end
-
-  def rescore
-    score = calculate_activity_score
-    score_at = last_scorable_activity_at
-
-    update! \
-      activity_score: score,
-      activity_score_at: score_at,
-      activity_score_order: event_score_reference(score, score_at)
-  end
-
-  private
-    def calculate_activity_score
-      scorable_events.sum { |event| event_score(event) }
-    end
-
-    def event_score(event)
-      days_ago = (last_scorable_activity_at - event.created_at) / 1.day
-      event_weight(event) / (2**days_ago)
-    end
-
-    def event_weight(event)
-      case
-      when event.comment&.first_by_author_on_card? then 20
-      when event.comment&.follows_comment_by_another_author? then 15
-      when event.commented? then 10
-      else 0
-      end
-    end
-
-    def event_score_reference(score, activity_at)
-      # The reference score is used to make the activity score comparable
-      # across different cards, since it represents the card's activity
-      # level at a consistent point in time.
-      #
-      # We store this as log2 to tame the huge/tiny numbers we'd otherwise get
-      # when activity is far from the reference date.
-      days_diff = (activity_at - REFERENCE_DATE) / 1.day
-      Math.log2(1.0 + score) + days_diff
-    end
-
-    def last_scorable_activity_at
-      scorable_events.maximum(:created_at) || created_at
-    end
-
-    def scorable_events
-      events.where(action: :commented)
-    end
-end
diff --git a/test/models/card/scorable_test.rb b/test/models/card/scorable_test.rb
deleted file mode 100644
index f24785e63..000000000
--- a/test/models/card/scorable_test.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-require "test_helper"
-
-class Card::ScorableTest < ActiveSupport::TestCase
-  test "cards with no activity have a valid activity_score_order" do
-    card = Card.create! collection: collections(:writebook), creator: users(:kevin)
-
-    card.rescore
-
-    assert card.activity_score.zero?
-    assert_not card.activity_score_order.infinite?
-  end
-end