add index

db/migrate/20261102120000_add_submission_events_account_event_type_created_at_index.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AddSubmissionEventsAccountEventTypeCreatedAtIndex < ActiveRecord::Migration[8.1]
+  def change
+    return unless ENV['MULTITENANT'] == 'true'
+
+    add_index :submission_events, %i[account_id created_at],
+              where: "event_type = 'start_kba'",
+              if_not_exists: true,
+              name: 'index_submission_events_on_account_created_at_start_kba'
+  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[8.1].define(version: 2026_11_01_120000) do
+ActiveRecord::Schema[8.1].define(version: 2026_11_02_120000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "btree_gin"
   enable_extension "pg_catalog.plpgsql"
@@ -362,6 +362,7 @@ ActiveRecord::Schema[8.1].define(version: 2026_11_01_120000) do
     t.datetime "updated_at", null: false
     t.index ["account_id", "created_at"], name: "index_submissions_events_on_sms_event_types", where: "((event_type)::text = ANY (ARRAY[('send_sms'::character varying)::text, ('send_2fa_sms'::character varying)::text]))"
     t.index ["account_id"], name: "index_submission_events_on_account_id"
+    t.index ["account_id", "created_at"], name: "index_submission_events_on_account_created_at_start_kba", where: "((event_type)::text = 'start_kba'::text)"
     t.index ["created_at"], name: "index_submission_events_on_created_at"
     t.index ["submission_id"], name: "index_submission_events_on_submission_id"
     t.index ["submitter_id"], name: "index_submission_events_on_submitter_id"