add relay charts and optimize relay settings

src/GreenHome.Api/Controllers/TelemetryController.cs

@@ -1,6 +1,8 @@
 using Microsoft.AspNetCore.Mvc;
 using GreenHome.Application;
+using Microsoft.AspNetCore.Http;
 using System.Text;
+using System.Text.RegularExpressions;
 
 namespace GreenHome.Api.Controllers;
 
@@ -31,6 +33,7 @@ public class TelemetryController : ControllerBase
     public async Task<ActionResult<string>> Create([FromQuery] TelemetryDto telementry, [FromQuery] string? lastUpdateDate, CancellationToken cancellationToken)
     {
         telementry.TimestampUtc = DateTime.UtcNow;
+        telementry.RelayStates = ParseRelayStates(Request.Query);
         var id = await telemetryService.AddAsync(telementry, cancellationToken);
 
         var parts = new List<string> { $"ID:{id}" };
@@ -92,6 +95,32 @@ public class TelemetryController : ControllerBase
         }));
     }
 
+    /// <summary>
+    /// Collect relay states from query params r1, r2, ... (missing relay = off/0).
+    /// </summary>
+    private static string? ParseRelayStates(IQueryCollection query)
+    {
+        var entries = new List<(int Index, string Value)>();
+        foreach (var key in query.Keys)
+        {
+            var match = Regex.Match(key, @"^r(\d+)$", RegexOptions.IgnoreCase);
+            if (!match.Success || !int.TryParse(match.Groups[1].Value, out var index) || index <= 0)
+                continue;
+
+            entries.Add((index, query[key].ToString() == "1" ? "1" : "0"));
+        }
+
+        if (entries.Count == 0)
+            return null;
+
+        var states = new string[entries.Max(e => e.Index)];
+        Array.Fill(states, "0");
+        foreach (var entry in entries)
+            states[entry.Index - 1] = entry.Value;
+
+        return string.Join(",", states);
+    }
+
     /// <summary>
     /// Parse date string in format: yyyy/MM/dd-HH:mm
     /// </summary>