cache the summary

db/migrate/20260129180004_add_cached_summary_to_conversations.rb

@@ -0,0 +1,6 @@
+class AddCachedSummaryToConversations < ActiveRecord::Migration[7.1]
+  def change
+    add_column :conversations, :cached_summary, :text
+    add_column :conversations, :cached_summary_at, :datetime
+  end
+end

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_01_20_121402) do
+ActiveRecord::Schema[7.1].define(version: 2026_01_29_180004) do
   # These extensions should be enabled to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -681,6 +681,8 @@ ActiveRecord::Schema[7.1].define(version: 2026_01_20_121402) do
     t.datetime "waiting_since"
     t.text "cached_label_list"
     t.bigint "assignee_agent_bot_id"
+    t.text "cached_summary"
+    t.datetime "cached_summary_at"
     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"