fix completed_at index

db/migrate/20260627065517_remove_submitters_completed_at_index.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class RemoveSubmittersCompletedAtIndex < ActiveRecord::Migration[8.1]
+  def up
+    remove_index :submitters, %i[completed_at account_id], if_exists: true
+  end
+
+  def down
+    add_index :submitters, %i[completed_at account_id], if_not_exists: true
+  end
+end

db/migrate/20260627083558_add_submitters_completed_at_partial_index.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class AddSubmittersCompletedAtPartialIndex < ActiveRecord::Migration[8.1]
+  def up
+    add_index :submitters, %i[account_id completed_at], where: 'completed_at IS NOT NULL', if_not_exists: true
+  end
+
+  def down
+    remove_index :submitters, %i[account_id completed_at], if_exists: 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[8.1].define(version: 2026_05_06_121640) do
+ActiveRecord::Schema[8.1].define(version: 2026_06_27_083558) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "btree_gin"
   enable_extension "pg_catalog.plpgsql"
@@ -405,8 +405,8 @@ ActiveRecord::Schema[8.1].define(version: 2026_05_06_121640) do
     t.datetime "updated_at", null: false
     t.string "uuid", null: false
     t.text "values", null: false
+    t.index ["account_id", "completed_at"], name: "index_submitters_on_account_id_and_completed_at", where: "(completed_at IS NOT NULL)"
     t.index ["account_id", "id"], name: "index_submitters_on_account_id_and_id"
-    t.index ["completed_at", "account_id"], name: "index_submitters_on_completed_at_and_account_id"
     t.index ["email"], name: "index_submitters_on_email"
     t.index ["external_id"], name: "index_submitters_on_external_id"
     t.index ["slug"], name: "index_submitters_on_slug", unique: true