# Live collaboration (Yjs): a document's content is the sum of its Yjs
# updates. `documents.content` stays as a JSON snapshot (duplicate, export,
# the first conversion to Yjs). The edit lock and version counter go.
class LiveCollaboration < ActiveRecord::Migration[8.1]
  def change
    create_table :document_updates do |t|
      t.references :document, type: :uuid, null: false, foreign_key: { on_delete: :cascade }
      t.references :user, foreign_key: { on_delete: :nullify }
      t.binary :data, null: false
      t.datetime :created_at, null: false
    end

    remove_column :documents, :version, :integer, null: false, default: 1
    remove_column :documents, :lock_holder, :string
    remove_column :documents, :lock_holder_name, :string
    remove_column :documents, :lock_expires_at, :datetime
  end
end