.tip

Feb 26, 2026 · one of the small things

blame with -w -C to see through reformatting

One formatter run makes the formatter's commit the author of every line. -w ignores whitespace, and -C follows lines that moved over from another file.

git blame -w -C -C -C src/checkout.ts

Put the big reformatting commits in a .git-blame-ignore-revs file and set blame.ignoreRevsFile, and GitHub's blame view skips them as well.

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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