add submission tracking events

app/models/submission_event.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: submission_events
+#
+#  id              :bigint           not null, primary key
+#  data            :text             not null
+#  event_timestamp :datetime         not null
+#  event_type      :string           not null
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  submission_id   :bigint           not null
+#  submitter_id    :bigint
+#
+# Indexes
+#
+#  index_submission_events_on_submission_id  (submission_id)
+#  index_submission_events_on_submitter_id   (submitter_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (submission_id => submissions.id)
+#  fk_rails_...  (submitter_id => submitters.id)
+#
+class SubmissionEvent < ApplicationRecord
+  belongs_to :submission
+  belongs_to :submitter, optional: true
+
+  attribute :data, :string, default: -> { {} }
+  attribute :event_timestamp, :datetime, default: -> { Time.current }
+
+  serialize :data, JSON
+
+  before_validation :set_submission_id, on: :create
+
+  enum :event_type, {
+    send_email: 'send_email',
+    send_sms: 'send_sms',
+    open_email: 'open_email',
+    click_email: 'click_email',
+    click_sms: 'click_sms',
+    start_form: 'start_form',
+    view_form: 'view_form',
+    complete_form: 'complete_form'
+  }, scope: false
+
+  private
+
+  def set_submission_id
+    self.submission_id = submitter&.submission_id
+  end
+end