Migrate paperclip _file_size columns to bigint (#29263)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

db/migrate/20240217175251_convert_file_size_columns_to_big_int.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require_relative '../../lib/mastodon/migration_helpers'
+
+class ConvertFileSizeColumnsToBigInt < ActiveRecord::Migration[7.1]
+  include Mastodon::MigrationHelpers
+
+  TABLE_COLUMN_MAPPING = [
+    [:accounts, :avatar_file_size],
+    [:accounts, :header_file_size],
+    [:custom_emojis, :image_file_size],
+    [:imports, :data_file_size],
+    [:media_attachments, :file_file_size],
+    [:media_attachments, :thumbnail_file_size],
+    [:preview_cards, :image_file_size],
+    [:site_uploads, :file_file_size],
+  ].freeze
+
+  disable_ddl_transaction!
+
+  def migrate_columns(to_type)
+    TABLE_COLUMN_MAPPING.each do |column_parts|
+      table, column = column_parts
+
+      # Skip this if we're resuming and already did this one.
+      next if column_for(table, column).sql_type == to_type.to_s
+
+      safety_assured do
+        change_column_type_concurrently table, column, to_type
+        cleanup_concurrent_column_type_change table, column
+      end
+    end
+  end
+
+  def up
+    migrate_columns(:bigint)
+  end
+
+  def down
+    migrate_columns(:integer)
+  end
+end