Stack. PHP 8 and MySQL 8 behind Apache, written for this platform without a framework. Charts are dependency-free SVG drawn by assets/app.js. No third-party library is part of the tree; the one outside service is the Anthropic API, called from inc/ai.php for the Ask Grímnir page with a key held in the excluded configuration file.

From instrument to published table. cron/poll_all.php runs on a schedule and calls one client per instrument family under cron/clients/ (weather station, water-quality sonde, aquifer logger, sky quality meter, footfall counters, acoustic recorders). Each pull is stored as a raw file, checksummed and listed in files_raw (the Raw Vault), then parsed into readings rows: stream, timestamp, value, and a placeholder flag. Every stream starts in placeholder mode and flips to live with its first real reading; cron/health_check.php watches freshness and completeness. Pages under pages/ render the readings through inc/streampage.php and inc/helpers.php (series, latest, mode badges); api.php serves the same readings to keyed clients. schema.sql defines the tables.

Excluded, and why. config.php and its template (credentials); data/ (raw files, uploads, media); logs; admin/ (the write path, no part of how a published number is produced); diagnose.php (server layout); the snapshots themselves. Paths are shown relative to the application root. E-mail addresses other than the company's are redacted at snapshot time, and a scan for secret-like strings refuses to publish a snapshot that contains one; the allowlist and the snapshot script are in the tree (inc/code-allowlist.php, inc/code-snapshot.php).

Versions. A snapshot is written at each deploy. The version is the UTC date plus seven characters of the tree's SHA-256, so an unchanged tree keeps its version and a changed one cannot hide. Every version stays reachable by its stamp, every page footer prints the version that rendered it, and a citation reads: file, lines, platform code version.

Source shown for scrutiny of the research platform. All rights reserved. Not offered as installable software.