fix completed_at index

app/controllers/api/submitters_controller.rb

@@ -104,7 +104,7 @@ module Api
 
     private
 
-    def maybe_filder_by_completed_at(submitters, params)
+    def maybe_filter_by_completed_at(submitters, params)
       if params[:completed_after].present?
         submitters = submitters.where(completed_at: Time.zone.parse(params[:completed_after])..)
       end
@@ -177,7 +177,7 @@ module Api
         submitters = submitters.joins(:submission).where(submissions: { template_id: params[:template_id] })
       end
 
-      maybe_filder_by_completed_at(submitters, params)
+      maybe_filter_by_completed_at(submitters, params)
     end
 
     def assign_external_id(submitter, attrs)

app/models/submitter.rb

@@ -28,8 +28,8 @@
 #
 # Indexes
 #
+#  index_submitters_on_account_id_and_completed_at  (account_id,completed_at) WHERE (completed_at IS NOT NULL)
 #  index_submitters_on_account_id_and_id            (account_id,id)
-#  index_submitters_on_completed_at_and_account_id  (completed_at,account_id)
 #  index_submitters_on_email                        (email)
 #  index_submitters_on_external_id                  (external_id)
 #  index_submitters_on_slug                         (slug) UNIQUE

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