Generowanie wykresu Opcje

[KR2615]

Hej. Mam stację meteorologiczną z trzema czujnikami, która co minutę dokonuje odczytu, przesyła to do skryptu .php który zapisuje wszystko w bazie MySQL. Później generuję z tego wykres z pomocą Chart.js (po 4 słupki na godzinę, każdy ze średnią z 15 minut)

Kod PHP wygląda tak:

[PHP] pobierz, plaintext 
function Temperaturechart($days) {
if($days == 1) {
    // Hour average
    $startH = date("H",time());
    $tday = date("Y-m-d",time());
    $yday = date("Y-m-d",time()-$days*86400);
    $tdayshort = date("d-m",time());
    $ydayshort = date("d-m",time()-$days*86400);
}
$sensors = array('IN','OUT','Akwa');
foreach($sensors as $sensor) {
$data = '';
$lastvalue = 0;
//Yesterday from current H to midnight
for($YH = $startH; $YH < 24; $YH++) {
    $m = 0;
    while($m < 60) {
	$mn = $m+15;
	if($mn == 60) {
	    if($YH == 23) {
		$q="SELECT AVG(value) AS value, COUNT(id) AS number FROM `temperatures` WHERE sensor='$sensor' AND `date` BETWEEN '$yday $YH:$m' AND '$tday 00:00'";
		$temp = mysql_fetch_array(mysql_query($q));
		if($sensor == 'IN') { $labels .= "\"$ydayshort $YH:$m\","; }
		if($temp['value'] == 0) {
		    $value = $lastvalue;
		} else {
		    $lastvalue = $temp['value'];
		    $value = $temp['value'];
		}
		$data .= "\"$value\",";
	    } else {
		//Next hour, minute 00
		$NH = $YH+1;
		$q="SELECT AVG(value) AS value, COUNT(id) AS number FROM `temperatures` WHERE sensor='$sensor' AND `date` BETWEEN '$yday $YH:$m' AND '$yday $NH:00'";
		$temp = mysql_fetch_array(mysql_query($q));
		if($sensor == 'IN') { $labels .= "\"$ydayshort $YH:$m\","; }
		if($temp['value'] == 0) {
		    $value = $lastvalue;
		} else {
		    $lastvalue = $temp['value'];
		    $value = $temp['value'];
		}
		$data .= "\"$value\",";
	    }
	} else {
	    $q="SELECT AVG(value) AS value, COUNT(id) AS number FROM `temperatures` WHERE sensor='$sensor' AND `date` BETWEEN '$yday $YH:$m' AND '$yday $YH:$mn'";
	    $temp = mysql_fetch_array(mysql_query($q));
	    if($sensor == 'IN') { $labels .= "\"$ydayshort $YH:$m\","; }
	if($temp['value'] == 0) {
		$value = $lastvalue;
	    } else {
		$lastvalue = $temp['value'];
		$value = $temp['value'];
	    }
	    $data .= "\"$value\",";
	}
	$m=$mn;
    }
}
// Today from 0 to current hour
for($TH = 0; $TH < $startH; $TH++) {
    $m = 0;
    while($m < 60) {
	$mn = $m+15;
	if($mn == 60) {
	    if($TH == 23) {
		$q="SELECT AVG(value) AS value, COUNT(id) AS number FROM `temperatures` WHERE sensor='$sensor' AND `date` BETWEEN '$tday $YH:$m' AND '$tday 23:59';";
		$temp = mysql_fetch_array(mysql_query($q));
		if($sensor == 'IN') { $labels .= "\"$tdayshort $TH:$m\","; }
		if($temp['value'] == 0) {
		    $value = $lastvalue;
		} else {
		    $lastvalue = $temp['value'];
		    $value = $temp['value'];
		}
		$dataAkwa .= "\"$value\",";
	    } else {
		//Next hour, minute 00
		$NH = $TH+1;
		$q="SELECT AVG(value) AS value, COUNT(id) AS number FROM `temperatures` WHERE sensor='$sensor' AND `date` BETWEEN '$tday $TH:$m' AND '$tday $NH:00';";
		$temp = mysql_fetch_array(mysql_query($q));
		if($sensor == 'IN') { $labels .= "\"$tdayshort $TH:$m\","; }
		if($temp['value'] == 0) {
		    $value = $lastvalue;
		} else {
		    $lastvalue = $temp['value'];
		    $value = $temp['value'];
		}
		$data .= "\"$value\",";
	    }
	} else {
	    $q="SELECT AVG(value) AS value, COUNT(id) AS number FROM `temperatures` WHERE sensor='$sensor' AND `date` BETWEEN '$tday $TH:$m' AND '$tday $TH:$mn';";
	    $temp = mysql_fetch_array(mysql_query($q));
	    if($sensor == 'IN') { $labels .= "\"$tdayshort $TH:$m\","; }
	if($temp['value'] == 0) {
		$value = $lastvalue;
	    } else {
		$lastvalue = $temp['value'];
		$value = $temp['value'];
	    }
	    $data .= "\"$value\",";
	}
	$m=$mn;
    }
}
${"data$sensor"}  = $data;
}
    echo '<div class="card mb-3">
    <div class="card-body">
	<canvas id="Temperaturechart"></canvas>
    </div>
</div>
 
<script>
var ctxL = document.getElementById("Temperaturechart").getContext(\'2d\');
var myLineChart = new Chart(ctxL, {
type: \'line\',
data: {
labels: ['.$labels.'],
datasets: [{
label: "OUT",
data: ['.$dataOUT.'],
backgroundColor: [
\'rgba(0,0,0, .2)\',
],
borderColor: [
\'#aaaaaa\',
],
borderWidth: 2
},{
label: "IN",
data: ['.$dataIN.'],
backgroundColor: [
\'rgba(154, 207, 75, .2)\',
],
borderColor: [
\'#9acf4b\',
],
borderWidth: 2
},{
label: "Akwa",
data: ['.$dataAkwa.'],
backgroundColor: [
\'rgba(66, 170, 243, .2)\',
],
borderColor: [
\'#42aaf3\',
],
borderWidth: 2
},
]
},
options: {
responsive: true
}
 
});
</script>';
}
[PHP] pobierz, plaintext 

Kod HTML wygląda tak:
https://pastebin.com/VQPFZPKF

Nie do końca podoba mi się to rozwiązanie. Raz ze względu na obciążenie - prawie 300 kwerend dla trzech czujników. Dwa że kod jest bardzo skomplikowany a to tylko wykres dla jednego dnia. Boje się pomyśleć nad tygodniem, miesiącem a może rokiem.

Czy istnieje coś innego, gotowiec, który generuje dane dla Chart.js który by mi w tym pomógł?

Lub może w ogóle zrezygnować z MySQLa i oprzeć to na czymś innym?