https://uningenieur.fr/tags/fastapi/Recent content in Fastapi on aperrot 🍹 homeHugoenTue, 02 Jun 2026 00:00:00 +0000https://uningenieur.fr/posts/private-baby-tracker/Tue, 02 Jun 2026 00:00:00 +0000https://uningenieur.fr/posts/private-baby-tracker/<p>We had a baby. Like every sleep-deprived parent we reached for an app to log the feeds, the diapers and the naps, the stuff you genuinely cannot remember at 4am when the pediatrician asks &ldquo;and how often is he eating?&rdquo;. I downloaded a few of the popular ones, started reading their privacy policies, and quietly closed all of them.</p> <p>Because here is the thing nobody puts on the App Store screenshot: a baby tracker is one of the most intimate datasets a family ever produces. Feeding times, sleep patterns, weight curves, health events, minute by minute, for years. I work next to people who do data-marketing and profiling for a living, and the industry is genuinely, impressively good at it. I did not want my son to have a behavioural profile before he could walk. So I built my own, used it at home, and then made it public to share with colleagues. This is that story, and it is at least as much about <em>how</em> I built it as <em>what</em> I built.</p>