Finished phase006

app/models/maintenance_notification.rb

@@ -0,0 +1,18 @@
+class MaintenanceNotification
+  NOTIFIABLE_STATUSES = %w[upcoming overdue].freeze
+
+  def self.record_status_change(schedule, status)
+    return if schedule.last_status == status.status
+
+    previous_status = schedule.last_status.presence || "unknown"
+    schedule.update!(last_status: status.status, last_status_changed_at: Time.current)
+    return unless NOTIFIABLE_STATUSES.include?(status.status)
+
+    Rails.logger.warn(
+      "Maintenance schedule #{status.status}: vehicle_id=#{schedule.vehicle_id} " \
+        "maintenance_schedule_id=#{schedule.id} maintenance_type=#{schedule.maintenance_type.inspect} " \
+        "previous_status=#{previous_status} due_odometer=#{status.due_odometer} due_date=#{status.due_date} " \
+        "reason=#{status.reason.inspect}"
+    )
+  end
+end