- scripts/install.sh: one-command hardened deploy (creates the water-monitor
system user, deploys to /opt, builds a uv-managed venv, installs and enables
the systemd unit). Idempotent; excludes .env/*.db/stations.json from sync so
runtime state is preserved.
- Fix placeholder Documentation= URL in water-monitor.service.
- README: document the script as the primary systemd install path, with manual
steps kept as a fallback.
