.tip

Apr 27, 2026 · one of the small things

Never plain force push, use --force-with-lease

--force overwrites whatever is on the remote, including a commit a colleague pushed while you were rebasing. --force-with-lease refuses if the remote has moved since you last fetched.

git push --force-with-lease

Make it an alias. The one time it saves you pays for every keystroke you ever typed.

git

~/tips/today — 2026-10-19

~cat tips/today

Never build an index on a live table without CONCURRENTLY

postgresqlmigrations

A plain CREATE INDEX takes a lock that blocks every write to the table for the whole build. On a big table that means minutes of outage that look like a hung app.

CREATE INDEX CONCURRENTLY orders_customer_idx ON orders (customer_id);

It's slower and can't run inside a transaction, so you'll have to tell your migration tool. If it fails halfway, it leaves an invalid index behind, so check pg_index.indisvalid and drop it before you retry.

↵ open y yesterday l ls /tips

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