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queryLatestTemperatures picked the single most-recent row per city with no regard for whether that row's tempAvg was actually populated yet. The open-data source publishes fields on different schedules within the same hour (snow lands well before the hourly temperature aggregate), so the freshest row for a city routinely has a real dateTime but a still-null tempAvg while the previous hour's row has good data. Confirmed live on both Rocky and the VPS: every city's newest row had tempAvg null (but a real snowAvg=0), one hour after the actual last real reading. Fixed by requiring tempAvg IS NOT NULL in the WHERE clause, so DISTINCT ON's "most recent" pick skips a fresh partial row and finds the newest row that actually has a value. Checked before changing: this is the only caller of queryLatestTemperatures (Faktiskā's fixed-station lookup); a city with zero real temperature history ever now returns no row instead of a null-valued one, which the frontend already treats identically to a present-but-null observation (falls through to the same "Nav datu" missing state either way) -- confirmed via MapGraphics.tsx before shipping, not assumed.
Weather Tool
Tool for downloading historical and real-time data from weather stations in Latvia. It aggregates and displays data for different time periods, cities, and weather parameters.
Setup
Rename .env-sample to .env and fill in credentials
Environment boundary
- Windows: source editing, review, and Git operations only. Do not compile, build, run containers, install project dependencies, or test the application here.
- Rocky Linux: the only development runtime; compile, build, run, seed, and test WeatherTool here.
- Ubuntu VPS: deployment target only. It receives the reviewed release artifact built and verified on Rocky; it is not a development or build host.
Run
docker-compose up --build --no-cache --force-recreate
Web
nginx proxy config
server {
listen 80;
server_name laikazinas.lsm.lv;
location / {
proxy_pass http://localhost:9090; # Forward requests to the Scala app
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
Rocky development runtime
// 1st terminal
podman-compose up postgres
// 2nd terminal
sbt run
// 3rd terminal
cd web/
npm run dev
Run one file
sbt "runMain grib.GribParserTest"
Backend Tech:
- scala: cats-effects, http4s, fs2, circe, scalatest
- postgres
Frontend Tech:
- SolidJS
- Vite
Fly commands
// suspend instance
fly scale count 0
// check display
fly ssh console
df -h
fly scale memory 512