Otherwise I’d have to install a gui

Respectfully, that’s not true. GDPR Article 2(2)©:

2. This Regulation does not apply to the processing of personal data: © by a natural person in the course of a purely personal or household activity;

Excuse my ignorance but what chapter / section of the GDPR deals with end users downloading pdfs?

If you’re already using an esp32 why not just get a simple ultrasonic sensor and measure flow on an indoor inlet pipe? You may need to know the pressure (probably 1.7 kPa) and temperature but that should be possible to calibrate against your meter readings

Then your project just becomes a simple pipe clamp that can be indoors

This just seems to be detecting if the browser is Firefox. The function is even named isGecko which is Mozilla’s browser engine used by Firefox. Edge, IE (Trident) don’t return true from isGecko

Unless I’m missing something I don’t see where the delay is added

It’s not really like they are storing DNA sequences anyways. They use a genotyping array which just reads ~650k single nucleotide polymorphisms (SNPs).

An analogy would be 23andme has a 6.4mil page book of DNA for a single customer but they only know the position and letter of single character on every tenth page. Sure it’s enough to identify someone (You can confidently use 50 SNPs to identify these days) but it’s not like 23andme was ever storing a whole genome