CREATE TABLE campaigns (
  id TEXT PRIMARY KEY,
  code TEXT NOT NULL UNIQUE,
  name TEXT NOT NULL,
  audience_label TEXT NOT NULL,
  audience_group TEXT NOT NULL,
  status TEXT NOT NULL,
  total_recipients INTEGER NOT NULL DEFAULT 0,
  delivered_count INTEGER NOT NULL DEFAULT 0,
  read_count INTEGER NOT NULL DEFAULT 0,
  failed_count INTEGER NOT NULL DEFAULT 0,
  delivery_rate DOUBLE PRECISION,
  read_rate DOUBLE PRECISION,
  sent_at TIMESTAMP(3),
  scheduled_at TIMESTAMP(3),
  template_name TEXT,
  language TEXT,
  message_title TEXT,
  message_body TEXT,
  primary_button TEXT,
  secondary_button TEXT,
  banner_image_url TEXT,
  created_at TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE campaign_recipients (
  id TEXT PRIMARY KEY,
  campaign_id TEXT NOT NULL,
  phone_number TEXT NOT NULL,
  status TEXT NOT NULL,
  sent_at TIMESTAMP(3),
  error_reason TEXT,
  device_os TEXT,
  created_at TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
  CONSTRAINT campaign_recipients_campaign_id_fkey
    FOREIGN KEY (campaign_id) REFERENCES campaigns(id)
    ON DELETE CASCADE
    ON UPDATE CASCADE
);

CREATE INDEX campaign_recipients_campaign_id_status_idx
  ON campaign_recipients(campaign_id, status);

CREATE INDEX campaign_recipients_campaign_id_sent_at_idx
  ON campaign_recipients(campaign_id, sent_at);