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  • Deciding not to split a service, and writing down why

    Note2 min read

    The reporting module is slow, memory-hungry and occasionally takes the application down, which is a real argument for extracting it and not a sufficient one. The revisit condition…

  • A trait with a constant, and why I still avoid traits

    Note2 min read

    Constants in traits arrived in 8.2 and the first thing I did with the feature was decide not to use it. The method conflict rules have an escape…

  • A benchmark that measured the benchmark

    Note2 min read

    A microbenchmark showing one implementation four times faster than another, where the difference was the loop. Three separate errors in six lines: an unused result, a shared warm…

  • The log line that contained a token

    Note1 min read

    A debug log of an outbound request, including headers, including the authorisation header, retained for ninety days. A deny list is the wrong shape and is what everybody…

  • Moving a fifteen-year-old site into the site editor

    Deep dive15 min read

    A theme first written in 2008, 61 template files, and an editor who cannot change a footer without a deploy.

  • Container queries, and the sidebar that stopped needing a class

    Note1 min read

    A card that needed a –compact modifier wherever it appeared in a narrow column, applied by hand at every call site. The component now responds to the space…

  • An event log that is not an event store

    Deep dive10 min read

    Wanting to know what happened to an order without adopting event sourcing. A support question that takes twenty minutes and three tables.

  • Debian 12 on a host that had been on 10

    Note2 min read

    Two major versions in one jump, which the documentation says not to do and which is what the situation actually was. A rebuild is the honest test of…

  • A remote state lock held by a run that was cancelled

    Note2 min read

    A pipeline cancelled during an apply leaves the lock held, and every subsequent run fails with a lock ID and a timestamp. Step two is the one people…

  • The N+1 that only appeared in production

    Deep dive10 min read

    An endpoint at 40 ms locally and 2.1 seconds in production. Nine hundred queries on one request, and three on the same request in a test.