Some schema changes can take prohibitively long on large tables, so you do have to be careful. But there are ways of achieving the same results that are safe f

Some schema changes can take prohibitively long on large tables, so you do have to be careful. But there are ways of achieving the same results that are safe for production database. Braintree did a decent writeup on it. https://www.braintreepayments.com/blog/safe-operations-for-high-volume-postgresql/ https://www.braintreepayments.com/blog/safe-operations-for-h...