https://sensorrig.com/tags/migration/ Recent content in Migration on SensorRig — Real Raspberry Pi Sensor Monitoring Hugo en-us Mon, 03 Aug 2026 00:00:00 +0000 https://sensorrig.com/posts/rrdtool-to-sqlite-migration/ Mon, 03 Aug 2026 00:00:00 +0000 https://sensorrig.com/posts/rrdtool-to-sqlite-migration/ For two years my home sensors lived in RRDtool — one .rrd file per sensor, fixed-size round-robin archives, rrdtool fetch for everything. It worked, but it fought me on the one thing I actually wanted to do: ask questions of the data. You can’t JOIN RRD files. You can’t run a window function. You can’t easily say “show me every February where the mudroom dropped below 15°C.” So I migrated to SQLite in WAL mode (the same database the WAL post is about).