Involuntary churn: measure your number
Involuntary churn benchmarks do not share a denominator. Measure recovered dollars per failed dollar in your own Stripe account, then add layers in order.
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Practical notes on building, deploying, and shipping real products for solo devs and small teams.
Prompt caching is a prefix problem
Prompt caching reads cost a tenth of input on most tiers. The prefix that qualifies runs 512 to 4,096 tokens, and that floor picks your cheapest model.
The full disk that killed my database
A full disk corrupted my database's write-ahead log and it wouldn't start. The recovery runbook, and ops habits I deferred until Saturday made them due.
TLS without losing sleep
TLS breaks on a VPS two ways: silent expiry and deploys that drop sessions. Set it up so renewals run, sessions survive, and you stop worrying about it.
From AI prototype to paid product
AI gets you a prototype in minutes. The real work is webhooks, deploys, TLS, and refunds. Here is what lives in the gap and why it decides whether you ship.