A personal blog by Bart Hazen about software engineering, infrastructure, DevOps, AI, and the products I build.https://nimbleflux.nl/en-ushi@nimbleflux.nl (Bart Hazen)hi@nimbleflux.nl (Bart Hazen)Sat, 10 Oct 2026 07:59:14 GMThttps://nimbleflux.nl/blog/2026/06/glucosesync/https://nimbleflux.nl/blog/2026/06/glucosesync/When sensor vendors don't build watch apps, diabetics are stuck pulling out their phone. That's why I built GlucoseSync, a free and open-source CGM companion for Android and Wear OS with complications, configurable history charts, alerts, and pump data. Because this kind of technology should be available to everyone.Mon, 15 Jun 2026 00:00:00 GMTAndroidWear OSOpen SourceHealthKotlinBart Hazen <hi@nimbleflux.nl>https://nimbleflux.nl/blog/2026/05/clicklens/https://nimbleflux.nl/blog/2026/05/clicklens/A single-binary web app for analyzing ClickHouse query performance. Flame graphs, thread breakdowns, query fingerprints, cluster ops monitoring, and table optimization. Built because the built-in tools weren't enough.Fri, 29 May 2026 00:00:00 GMTClickHouseOpen SourceSelf-HostingDeveloper ToolsBart Hazen <hi@nimbleflux.nl>https://nimbleflux.nl/blog/2026/04/multi-tenancy-with-postgres-fdw/https://nimbleflux.nl/blog/2026/04/multi-tenancy-with-postgres-fdw/How I added multi-tenant isolation to Fluxbase using PostgreSQL's Foreign Data Wrapper, Row Level Security, and a hybrid database architecture, without breaking backward compatibility.Mon, 25 May 2026 00:00:00 GMTFluxbasePostgreSQLArchitectureOpen SourceBart Hazen <hi@nimbleflux.nl>https://nimbleflux.nl/blog/2026/03/introducing-fluxbase/https://nimbleflux.nl/blog/2026/03/introducing-fluxbase/A lightweight, single-binary Backend-as-a-Service. All the essential backend services in one Go binary, with PostgreSQL as the only dependency.Sun, 08 Mar 2026 00:00:00 GMTFluxbaseBackendSelf-HostingOpen SourceBart Hazen <hi@nimbleflux.nl>https://nimbleflux.nl/blog/2026/03/introducing-nimbleflux/https://nimbleflux.nl/blog/2026/03/introducing-nimbleflux/A new venture focused on rapid product development, building tools that solve real problems while learning and iterating quickly.Sun, 08 Mar 2026 00:00:00 GMTBart Hazen <hi@nimbleflux.nl>https://nimbleflux.nl/blog/2026/03/introducing-wayli/https://nimbleflux.nl/blog/2026/03/introducing-wayli/A privacy-first location tracking app born from frustration with backend complexity. How 15 containers led to building Fluxbase.Sun, 08 Mar 2026 00:00:00 GMTSelf-HostingPrivacyBart Hazen <hi@nimbleflux.nl>