Postgres
Renaming a column without downtime: expand, migrate, contract
ALTER TABLE ... RENAME COLUMN takes a millisecond and breaks every running pod. A step-by-step expand and contract rename in Postgres, with the trigger we use.
Topic · 3 stories
Reliability
Retries, idempotency, safe deploys and the habits that keep a service up when its dependencies are not.
Go
A retry helper with full jitter, in about 40 lines of Go
Exponential backoff without jitter turns one outage into synchronized waves of retries. Here is a small Go helper that gets backoff, jitter and cancellation right.
Reliability
Idempotency keys for webhooks: the ten lines that stop double charges
Webhook providers deliver at least once, so your handler will see duplicates. A unique key and one transaction in Postgres make that harmless.