feat: support querying and merging multiple sensors server-side

Co-authored-by: aider (gemini/gemini-3.1-pro-preview) <aider@aider.chat>

client/src/App.js

@@ -680,21 +680,18 @@ function MultiLineChart({title, measurement, dataKey, sensors, colors, end, dura
 				const api_key = localStorage.getItem('api_key', 'null');
 				const params = { end: end.unix(), duration: duration.len.toLowerCase(), window: duration.win, api_key: api_key };
 				
-				const responses = await Promise.all(
-					sensors.map(name => axios.get(`https://sensors-api.dns.t0.vc/history/${measurement}/${name}`, { params }))
-				);
-
-				const timeMap = {};
-				responses.forEach((res, i) => {
-					const sensorName = sensors[i];
-					res.data.forEach(d => {
-						if (!timeMap[d.time]) timeMap[d.time] = { time: d.time };
-						timeMap[d.time][sensorName] = d[dataKey];
+				const names = sensors.join(',');
+				const res = await axios.get(`https://sensors-api.dns.t0.vc/history/${measurement}/${names}`, { params });
+				
+				const formattedData = res.data.map(d => {
+					const newObj = { time: d.time };
+					sensors.forEach(sensor => {
+						newObj[sensor] = d[`${sensor}_${dataKey}`];
 					});
+					return newObj;
 				});
-
-				const merged = Object.values(timeMap).sort((a, b) => a.time.localeCompare(b.time));
-				setData(merged);
+				
+				setData(formattedData);
 				setLoading(false);
 			} catch (error) {
 				console.log(error);