ALTER TABLE notification_settings
    ADD COLUMN IF NOT EXISTS email_enabled TINYINT(1) NOT NULL DEFAULT 0 AFTER alert_remaining_balance,
    ADD COLUMN IF NOT EXISTS email_recipients TEXT NULL AFTER email_enabled,
    ADD COLUMN IF NOT EXISTS email_from_name VARCHAR(120) NOT NULL DEFAULT 'Locative' AFTER email_recipients,
    ADD COLUMN IF NOT EXISTS email_from_address VARCHAR(160) NULL AFTER email_from_name;