Add read_at to messages, fix datetime logic

- Signal sends 13 digit timestamps(milliseconds), which need to be
  converted to seconds before converting to a datetime in ruby otherwise
the datetime is not accurate

app/jobs/signal_adapter/receive_polling_job.rb

@@ -30,9 +30,7 @@ def perform(*_args)
       end
 
       adapter.on(SignalAdapter::HANDLE_DELIVERY_RECEIPT) do |delivery_receipt, contributor|
-        if delivery_receipt[:isDelivery]
-          contributor.received_messages.first.update(received_at: Time.zone.at(delivery_receipt[:when]).to_datetime)
-        end
+        handle_delivery_receipt(delivery_receipt, contributor)
       end
 
       signal_messages.each do |raw_message|
@@ -70,5 +68,12 @@ def handle_connect(contributor)
       SignalAdapter::Outbound.send_welcome_message!(contributor)
       SignalAdapter::AttachContributorsAvatarJob.perform_later(contributor)
     end
+
+    def handle_delivery_receipt(delivery_receipt, contributor)
+      datetime = Time.zone.at(delivery_receipt[:when] / 1000).to_datetime
+      latest_received_message = contributor.received_messages.first
+      latest_received_message.update(received_at: datetime) if delivery_receipt[:isDelivery]
+      latest_received_message.update(read_at: datetime) if delivery_receipt[:isRead]
+    end
   end
 end

db/migrate/20231024144124_add_read_at_to_messages.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddReadAtToMessages < ActiveRecord::Migration[6.1]
+  def change
+    add_column :messages, :read_at, :datetime, default: nil
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2023_09_15_070544) do
+ActiveRecord::Schema.define(version: 2023_10_24_144124) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
@@ -170,6 +170,7 @@
     t.bigint "creator_id"
     t.string "sender_type"
     t.datetime "received_at"
+    t.datetime "read_at"
     t.index ["creator_id"], name: "index_messages_on_creator_id"
     t.index ["recipient_id"], name: "index_messages_on_recipient_id"
     t.index ["request_id"], name: "index_messages_on_request_id"