WARNING: option --ssl-verify-server-cert is disabled, because of an insecure passwordless login.
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ALTER TABLE users
    ADD COLUMN newsletter_subscribed TINYINT(1) NOT NULL DEFAULT 0 AFTER birthday,
    ADD COLUMN newsletter_subscribed_at DATETIME NULL DEFAULT NULL AFTER newsletter_subscribed
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ERROR 1060 (42S21) at line 14: Duplicate column name 'newsletter_subscribed'
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ALTER TABLE users
    ADD COLUMN last_birthday_coupon_sent_at DATETIME NULL DEFAULT NULL AFTER newsletter_subscribed_at
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ERROR 1060 (42S21) at line 19: Duplicate column name 'last_birthday_coupon_sent_at'
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ALTER TABLE coupons
    ADD COLUMN user_id INT UNSIGNED NULL DEFAULT NULL AFTER code,
    ADD CONSTRAINT fk_coupons_user
        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
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ERROR 1060 (42S21) at line 25: Duplicate column name 'user_id'