add email events

app/models/email_event.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: email_events
+#
+#  id             :bigint           not null, primary key
+#  data           :text             not null
+#  email          :string           not null
+#  emailable_type :string           not null
+#  event_datetime :datetime         not null
+#  event_type     :string           not null
+#  tag            :string           not null
+#  created_at     :datetime         not null
+#  account_id     :bigint           not null
+#  emailable_id   :bigint           not null
+#  message_id     :string           not null
+#
+# Indexes
+#
+#  index_email_events_on_account_id  (account_id)
+#  index_email_events_on_emailable   (emailable_type,emailable_id)
+#  index_email_events_on_message_id  (message_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (account_id => accounts.id)
+#
+class EmailEvent < ApplicationRecord
+  belongs_to :emailable, polymorphic: true
+  belongs_to :account
+
+  attribute :data, :string, default: -> { {} }
+
+  serialize :data, coder: JSON
+
+  before_validation :maybe_set_account, on: :create
+
+  def maybe_set_account
+    self.account ||= emailable.account
+  end
+end