Create data_version.rb

Adds a model for DataVersion

app/models/data_version.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+class DataVersion < ActiveRecord::Base
+  validates :filename, presence: true, uniqueness: true
+  validates :imported_at, presence: true
+
+  def self.mark_as_imported(filename)
+    create!(filename: filename, imported_at: Time.current)
+  end
+
+  def self.imported?(filename)
+    exists?(filename: filename)
+  end
+end