diff --git a/db/migrate/20260807101420_add_account_status_created_at_index_to_conversations.rb b/db/migrate/20260807101420_add_account_status_created_at_index_to_conversations.rb
new file mode 100644
index 000000000..03a1e7c50
--- /dev/null
+++ b/db/migrate/20260807101420_add_account_status_created_at_index_to_conversations.rb
@@ -0,0 +1,12 @@
+class AddAccountStatusCreatedAtIndexToConversations < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    # Serves account-scoped conversation lists sorted by created_at (e.g. "newest first"),
+    # which otherwise fall back to a backward scan of the global created_at index.
+    add_index :conversations, [:account_id, :status, :created_at],
+              name: 'index_conversations_on_account_id_status_created_at',
+              algorithm: :concurrently,
+              if_not_exists: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index aa88cc546..9491abbda 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2026_08_06_000000) do
+ActiveRecord::Schema[7.1].define(version: 2026_08_07_101420) do
   # These extensions should be enabled to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -854,6 +854,7 @@ ActiveRecord::Schema[7.1].define(version: 2026_08_06_000000) do
     t.index ["account_id", "display_id"], name: "index_conversations_on_account_id_and_display_id", unique: true
     t.index ["account_id", "id"], name: "index_conversations_on_id_and_account_id"
     t.index ["account_id", "inbox_id", "status", "assignee_id"], name: "conv_acid_inbid_stat_asgnid_idx"
+    t.index ["account_id", "status", "created_at"], name: "index_conversations_on_account_id_status_created_at"
     t.index ["account_id"], name: "index_conversations_on_account_id"
     t.index ["assignee_id", "account_id"], name: "index_conversations_on_assignee_id_and_account_id"
     t.index ["campaign_id"], name: "index_conversations_on_campaign_id"