add submitter metadata

db/migrate/20240201210319_add_submitter_metadata.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class AddSubmitterMetadata < ActiveRecord::Migration[7.1]
+  class MigrationSubmitter < ApplicationRecord
+    self.table_name = 'submitters'
+  end
+
+  def change
+    add_column :submitters, :metadata, :text
+
+    MigrationSubmitter.where(metadata: nil).update_all(metadata: '{}')
+
+    change_column_null :submitters, :metadata, false
+  end
+end