Init

- aggiunto un po di tutto comeil progetto del prof

SeniorAssistant/Models/Heartbeat.cs

@@ -0,0 +1,21 @@
+using LinqToDB.Mapping;
+using System;
+
+namespace SeniorAssistant.Models
+{
+    public class Heartbeat : IHasTime
+    {
+        [PrimaryKey]
+        [NotNull]
+        public string Username { get; set; }
+
+        [PrimaryKey]
+        [NotNull]
+        public DateTime Time { get; set; }
+        
+        [Association(ThisKey = nameof(Username), OtherKey = nameof(User.Username), CanBeNull = false)]
+        public User user { get; set; }
+
+        public double Value { get; set; }
+    }
+}