pridany skript pre kontrolu zlyhania merani

AGENTS.md

@@ -6,6 +6,7 @@ This repository contains a small ESP8266/ESP32 Arduino project for monitoring wa
 
 - `arduino/arduino.ino` contains the Arduino sketch and main application logic.
 - `server/log.php` accepts measurement POST requests and appends them as JSON Lines.
+- `server/data-checker.php` is intended for hourly CRON runs and checks whether recent measurements are still being written.
 - `server/functions.inc.php` contains shared PHP helpers, including JSON responses, HTTP requests, and Telegram notifications.
 - `data/YYYY.jsonl` is created at runtime for logged measurements and should not be treated as source code.
 - `README.md` gives the high-level project purpose.
@@ -30,6 +31,7 @@ arduino-cli upload -p COM3 --fqbn esp32:esp32:esp32 arduino
 arduino-cli monitor -p COM3 -c baudrate=115200
 
 php -l server/log.php
+php -l server/data-checker.php
 php -l server/functions.inc.php
 ```
 
@@ -74,10 +76,13 @@ Before committing firmware changes:
 Before committing server changes:
 
 - Run `php -l server/log.php`.
+- Run `php -l server/data-checker.php` when the CRON checker changes.
 - Run `php -l server/functions.inc.php` when shared helpers change.
 - Test that non-POST requests return HTTP 405 with `Allow: POST`.
 - Test a form POST such as `level1=1&level2=0&level3=0&level4=1`.
 - Verify that a single compact JSON object is appended to `data/YYYY.jsonl`.
+- Verify the CRON checker stays silent when `data/YYYY.jsonl` is missing, empty, younger than 45 minutes, or older than 3 hours and 45 minutes.
+- Verify the CRON checker walks backward to the nearest valid JSON line when the last line is invalid.
 - For notification changes, verify that Telegram messages are sent only when `level1..level4` differ from the previous saved measurement.
 - Verify invalid level combinations such as `0100`, `1010`, and `1101` produce the measurement error notification without causing an HTTP error.