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This file is the single source of contacts for the site, the contact block, JSON-LD sameAs, security.txt and llms.txt.",[20,49,80,108,144],{"slug":21,"title":22,"blurb":23,"variant":24,"palette":25,"layout":26,"count":27,"preview":28,"stack":44},"landings","Landing pages","One page, one job. 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A language filter sits inside the section.","crystal","steel","list",24,[117,120,122,124],{"lang":118,"count":119},"Go",12,{"lang":121,"count":89},"Python",{"lang":123,"count":89},"Rust",{"lang":59,"count":89},[126,131,136],{"slug":127,"title":128,"shot":129,"hue":130},"kanban-tasks","Amber: kanban board","\u002Fshots\u002Fkanban-tasks-desktop-sm.webp",344,{"slug":132,"title":133,"shot":134,"hue":135},"link-shortener","Short: link shortener","\u002Fshots\u002Flink-shortener-desktop-sm.webp",111,{"slug":137,"title":138,"shot":139,"hue":140},"booking-slots","Appointment booking","\u002Fshots\u002Fbooking-slots-desktop-sm.webp",65,[142,47,143,118],"Docker","SQLite",{"slug":145,"title":146,"blurb":147,"variant":148,"palette":149,"layout":150,"count":27,"langs":151,"preview":158,"stack":174},"cli","CLI tools","Terminal programs: one binary, clear flags, an exit code you can check in a script.","swarm","champagne","terminal",[152,154,156,157],{"lang":118,"count":153},3,{"lang":121,"count":155},1,{"lang":123,"count":155},{"lang":59,"count":155},[159,164,169],{"slug":160,"title":161,"shot":162,"hue":163},"gitpulse","GitPulse: git repository analytics","\u002Fshots\u002Fgitpulse-desktop-sm.webp",7,{"slug":165,"title":166,"shot":167,"hue":168},"logslice","logslice: log analysis with no dependencies","\u002Fshots\u002Flogslice-desktop-sm.webp",160,{"slug":170,"title":171,"shot":172,"hue":173},"envguard","envguard: a linter and a safe for .env files","\u002Fshots\u002Fenvguard-desktop-sm.webp",35,[47,175,142,176],"CLI","stdlib only",{"slug":178,"title":179,"type":109,"category":109,"lang":123,"live_url":180,"stack":181,"description":189,"highlights":190,"run":195,"hue":168,"og":196,"shots":197,"case":205,"case_lang":5,"prev":217,"next":220},"flag-store","flag-store: feature flags with percentage rollout","https:\u002F\u002Fflag-store.ewsir.space",[123,182,183,143,184,185,186,187,188,142,47],"axum","tokio","SSE","SHA-256","proptest","musl","distroless","A feature flag service in Rust: per-environment flags, rules on user attributes, a percentage rollout with no randomness, an audit log and an SSE stream of changes. A user bucket is the first 8 bytes of SHA-256 over the flag and the id, modulo 10000, so the answer is stable and raising the percentage never switches anyone off. Shares are in basis points, there are no floats.",[191,192,193,194],"A deterministic rollout: SHA-256(flag, id) modulo 10000; one user always gets one answer","3 property tests: stability, monotonicity in the percentage, uniformity over 20,000 users within 2 pp","15 tests; an 11.6 MB image, 2.7 MiB RAM idle and 3.5 MiB after 200 evaluate calls","An SSE stream of changes with hello, change and resync; an audit log with the author and the before and after state","cd flag-store && cargo run --release","\u002Fog\u002Fen\u002Fflag-store.jpg",{"desktop":198,"desktop_sm":199,"mobile":200,"dw":201,"dh":202,"mw":203,"mh":204},"\u002Fshots\u002Fflag-store-desktop.webp","\u002Fshots\u002Fflag-store-desktop-sm.webp","\u002Fshots\u002Fflag-store-mobile.webp",1280,800,390,844,{"about":206,"features":207,"run":208,"notes":212},[189],[191,192,193,194],[209,210,211],"git clone \u003Crepository on request> flag-store","cd flag-store","cargo run --release",[213,214,215,216],"Reads and evaluate are open: close them at the proxy level.","SQLite with one connection under a mutex: it does not scale horizontally.","Build and tests ran in a rust:1-alpine container, cargo was not installed on the PC.","The project runs on a small VPS with demo data: no redundancy or backups.",{"slug":218,"title":219},"hook-relay","hook-relay: webhook delivery",{"slug":221,"title":222},"ledger-core","ledger-core: double entry and a hash-chained journal",[224,231,235,240,245,249,254,259,264,269],{"slug":225,"lang":5,"title":226,"date":227,"summary":228,"project":229,"minutes":230},"csp-no-inline-nuxt","CSP without inline scripts: what had to be switched off in Nuxt","2026-10-30","Why a strict script-src self policy breaks static Nuxt, which three steps made the site compatible, and the build check that keeps it so.","landscape-bureau-nuxt",2,{"slug":232,"lang":5,"title":233,"date":227,"summary":234,"project":221,"minutes":230},"hash-chain-tail-truncation","A hash-chained journal: what it catches and what it does not","How ledger-core builds a SHA-256 chain and checks it through \u002Fv1\u002Fverify, why tampering in the middle shows but tail truncation does not.",{"slug":236,"lang":5,"title":237,"date":227,"summary":238,"project":239,"minutes":230},"qr-from-scratch","A QR code from scratch: Reed-Solomon, masks and proving it right","How a zero-dependency QR encoder in TypeScript is built, and four independent ways to check that the matrix is correct.","qr-svg",{"slug":241,"lang":5,"title":242,"date":227,"summary":243,"project":244,"minutes":230},"sm2-day-boundaries","SM-2 and day boundaries: why the schedule is stored as dates","How flashcards-sm2 and habit-tracker avoid shifts from time zones and daylight saving: dates instead of timestamps and a movable day boundary.","flashcards-sm2",{"slug":246,"lang":5,"title":247,"date":227,"summary":248,"project":218,"minutes":230},"ssrf-after-dns","SSRF in webhooks: checking the address after DNS","Why a webhook delivery service checks the addresses after DNS resolution, not the URL string, and how hook-relay connects to the very address it checked.",{"slug":250,"lang":5,"title":251,"date":227,"summary":252,"project":253,"minutes":230},"token-bucket-integers","A token bucket on integers: what property tests check","How rate-gate computes a token bucket without floats, why milli-tokens, and which three properties the proptest property tests prove.","rate-gate",{"slug":255,"lang":5,"title":256,"date":257,"summary":258,"project":137,"minutes":155},"double-booking","Double booking: a transaction plus a partial UNIQUE index","2026-10-20","How booking-slots protects against two clients booking the same time at once, and how that protection is tested.",{"slug":260,"lang":5,"title":261,"date":257,"summary":262,"project":263,"minutes":230},"lease-and-fencing","Lease and fencing: how a queue neither loses a job nor lets a zombie finish it twice","A worker can crash, stall, or wake up after its job was taken by someone else. How the lease and the lease token in job-queue deal with that on SQLite.","job-queue",{"slug":265,"lang":5,"title":266,"date":257,"summary":267,"project":268,"minutes":230},"p95-nearest-rank","p95 in an uptime monitor: the nearest-rank method and what it does not hide","How uptime-monitor computes p50\u002Fp95 latency and uptime, why the nearest-rank method was chosen, and where those numbers can mislead.","uptime-monitor",{"slug":270,"lang":5,"title":271,"date":257,"summary":272,"project":273,"minutes":230},"websocket-from-scratch","WebSocket on the standard library: what really happens under new WebSocket()","Why realtime-rooms has its own RFC 6455 layer, which protocol violations it checks, and why a library is still the better choice for production.","realtime-rooms",1793371810368]