API USAGE GUIDE FOR RETRIEVING DATA FROM A WEATHER STATION
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1. Retrieving the Current (Last Saved) Value:
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HTTP GET:
https://pgsonda.cz/api/api_json_user.php?name=station_name&api_key=YOUR_API_KEY

Parameters:
 - name (required): User name or station identifier.
 - api_key (required): API key to authenticate the request.

Example:
 https://pgsonda.cz/api/api_json_user.php?name=station_name&api_key=***

2. Retrieving Data for a Specific Time Period:
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HTTP GET:
https://pgsonda.cz/api/api_json_user.php?name=station_name&start_date=2024_01_07&end_date=2024_01_08&api_key=YOUR_API_KEY

Parameters:
 - name (required): User name or station identifier.
 - start_date (optional): Start date (format: YYYY_MM_DD).
 - end_date (optional): End date (format: YYYY_MM_DD).
 - api_key (required): API key to authenticate the request.

Example:
 https://pgsonda.cz/api/api_json_user.php?name=station_name&start_date=2024_01_07&end_date=2024_01_08&api_key=***

3. JSON Response Format:
------------------------
Success:
{
  "status": "success",
  "data": [
    {
      "db_date": "2024-01-07",
      "db_time": "12:30:00",
      "db_avgdir": 186,
      "db_minspd": 2.3,
      "db_avgspd": 5.8,
      "db_maxspd": 10.2,
      "db_temp": 25.5,
      "db_hum": 45.0,
      "db_preszero": 1015.2,
      "db_bat": 100,
      "db_rain_hour": 0
    }
  ]
}

Error:
{
  "status": "error",
  "message": "Error description"
}

4. Field Descriptions:
----------------------
 - db_date       - date of data sample
 - db_time       - time of data sample
 - db_avgdir     - wind direction (°)
 - db_minspd     - minimum wind speed (m/s)
 - db_avgspd     - average wind speed (m/s)
 - db_maxspd     - maximum wind speed (m/s)
 - db_temp       - air temperature (°C)
 - db_hum        - air humidity (%RH)
 - db_preszero   - air pressure adjusted to sea level (Pa)
 - db_bat        - battery charge level of the weather station (%)
 - db_rain_hour  - rainfall amount (mm/h)