Rename column

`remote_items` was nice and short but could be misunderstood as
"how many items are accounts from other servers". This should
make it clear that this is the number of items for remote
collections that could in theory exceed Mastodon's limit.

app/models/collection.rb

@@ -9,7 +9,7 @@
 #  discoverable             :boolean          not null
 #  local                    :boolean          not null
 #  name                     :string           not null
-#  remote_items :integer
+#  original_number_of_items :integer
 #  sensitive                :boolean          not null
 #  uri                      :string
 #  created_at               :datetime         not null
@@ -28,7 +28,8 @@ class Collection < ApplicationRecord
   validates :name, presence: true
   validates :description, presence: true
   validates :uri, presence: true, if: :remote?
-  validates :remote_items, presence: true,
+  validates :original_number_of_items,
+            presence: true,
             numericality: { greater_than_or_equal: 0 },
             if: :remote?
   validate :tag_is_usable

db/migrate/20251118115657_create_collections.rb

@@ -11,7 +11,7 @@ class CreateCollections < ActiveRecord::Migration[8.0]
       t.boolean :sensitive, null: false # rubocop:disable Rails/ThreeStateBooleanColumn
       t.boolean :discoverable, null: false # rubocop:disable Rails/ThreeStateBooleanColumn
       t.references :tag, foreign_key: true
-      t.integer :remote_items
+      t.integer :original_number_of_items
 
       t.timestamps
     end

db/schema.rb

@@ -377,7 +377,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_11_19_093332) do
     t.boolean "sensitive", null: false
     t.boolean "discoverable", null: false
     t.bigint "tag_id"
-    t.integer "remote_items"
+    t.integer "original_number_of_items"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["account_id"], name: "index_collections_on_account_id"

spec/models/collection_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe Collection do
 
       it { is_expected.to validate_presence_of(:uri) }
 
-      it { is_expected.to validate_presence_of(:remote_items) }
+      it { is_expected.to validate_presence_of(:original_number_of_items) }
     end
 
     context 'when using a hashtag as category' do