add is first to completed submitters

db/migrate/20251121092044_add_is_first_to_completed_submitters.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AddIsFirstToCompletedSubmitters < ActiveRecord::Migration[8.0]
+  def change
+    # rubocop:disable Rails/ThreeStateBooleanColumn
+    add_column :completed_submitters, :is_first, :boolean
+    # rubocop:enable Rails/ThreeStateBooleanColumn
+
+    add_index :completed_submitters, %i[account_id completed_at], where: 'is_first = TRUE'
+    add_index :completed_submitters, :submission_id, unique: true, where: 'is_first = TRUE'
+  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[8.0].define(version: 2025_11_21_090556) do
+ActiveRecord::Schema[8.0].define(version: 2025_11_21_092044) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "btree_gin"
   enable_extension "plpgsql"
@@ -118,7 +118,10 @@ ActiveRecord::Schema[8.0].define(version: 2025_11_21_090556) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.string "verification_method"
+    t.boolean "is_first"
+    t.index ["account_id", "completed_at"], name: "index_completed_submitters_on_account_id_and_completed_at", where: "(is_first = true)"
     t.index ["account_id"], name: "index_completed_submitters_on_account_id"
+    t.index ["submission_id"], name: "index_completed_submitters_on_submission_id", unique: true, where: "(is_first = true)"
     t.index ["submitter_id"], name: "index_completed_submitters_on_submitter_id", unique: true
   end