Add aggregate API and fix (hack) time bucket

Environment/Service/Models/ReadingsAggregate.cs

@@ -0,0 +1,36 @@
+using System.Text.Json.Serialization;
+
+namespace ChrisKaczor.HomeMonitor.Environment.Service.Models;
+
+public class ReadingsAggregate
+{
+    [JsonPropertyName("name")]
+    public string? Name { get; set; }
+
+    [JsonPropertyName("minimumTemperature")]
+    public decimal MinimumTemperature { get; set; }
+
+    [JsonPropertyName("averageTemperature")]
+    public decimal AverageTemperature { get; set; }
+
+    [JsonPropertyName("maximumTemperature")]
+    public decimal MaximumTemperature { get; set; }
+
+    [JsonPropertyName("minimumPressure")]
+    public decimal MinimumPressure { get; set; }
+
+    [JsonPropertyName("averagePressure")]
+    public decimal AveragePressure { get; set; }
+
+    [JsonPropertyName("maximumPressure")]
+    public decimal MaximumPressure { get; set; }
+
+    [JsonPropertyName("minimumHumidity")]
+    public decimal MinimumHumidity { get; set; }
+
+    [JsonPropertyName("averageHumidity")]
+    public decimal AverageHumidity { get; set; }
+
+    [JsonPropertyName("maximumHumidity")]
+    public decimal MaximumHumidity { get; set; }
+}