synchronize documents generation

db/migrate/20230701075115_create_document_generation_events.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class CreateDocumentGenerationEvents < ActiveRecord::Migration[7.0]
+  def change
+    create_table :document_generation_events do |t|
+      t.references :submitter, null: false, foreign_key: true, index: true
+      t.string :event_name, null: false
+
+      t.index %i[submitter_id event_name], unique: true, where: "event_name IN ('start', 'complete')"
+
+      t.timestamps
+    end
+  end
+end