CREATE TABLE IF NOT EXISTS notifications (
  id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  type VARCHAR(50) NOT NULL,
  title VARCHAR(255) NOT NULL,
  description TEXT,
  link TEXT,
  is_read BOOLEAN NOT NULL DEFAULT FALSE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_notifications_user ON notifications(user_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_notifications_unread ON notifications(user_id, created_at DESC) WHERE is_read = FALSE;

CREATE TABLE IF NOT EXISTS notification_preferences (
  user_id UUID PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
  lead_assigned BOOLEAN NOT NULL DEFAULT TRUE,
  lead_status BOOLEAN NOT NULL DEFAULT TRUE,
  note_added BOOLEAN NOT NULL DEFAULT FALSE,
  daily_digest BOOLEAN NOT NULL DEFAULT FALSE,
  weekly_report BOOLEAN NOT NULL DEFAULT TRUE,
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);