参加者向けアナウンスのメール配信機能を実装

[Copilot]

Adds batch email delivery for published announcements, with delivery tracking and automatic dispatch on publish.

Schema

• announcement_deliveries table — delivery queue/result log per profile
• announcements gains send_status (pending/processing/completed), sent_count, failed_count
• FK from announcement_deliveries → announcements with ON DELETE CASCADE

Delivery pipeline

• Announcement#after_save triggers PrepareAnnouncementDeliveriesJob when publish flips to true
• PrepareAnnouncementDeliveriesJob — resolves target_profiles by receiver type, creates deliveries idempotently inside a transaction via find_or_create_by!
• SendAnnouncementBatchJob — sends BATCH_SIZE (default 10) emails per run, re-enqueues itself if remaining, marks completed when done

# Idempotent delivery creation with transaction safety
ActiveRecord::Base.transaction do
  profiles.each do |profile|
    AnnouncementDelivery.find_or_create_by!(announcement:, profile_id: profile.id) do |d|
      d.email = profile.email
      d.status = :queued
    end
  end
  announcement.update!(send_status: :processing)
end

Target resolution

Announcement#target_profiles returns the appropriate profile scope based on receiver:

• all_attendee / only_online / only_offline / early_bird
• Raises ArgumentError for unknown values

Admin UI

Announcement index shows send_status, sent_count, failed_count columns.

Other changes

• JobHelper#sqs_queue_url: hardened env var resolution, uses Rails.logger instead of warn
• Structured logging in both jobs for production observability
• Local SQS queue name aligned to fifo.fifo

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