Refactoring

* refactoring
* fixes
* messages
* new interface

SeniorAssistant/Models/Data/Heartbeat.cs

@@ -0,0 +1,18 @@
+using LinqToDB.Mapping;
+using System;
+
+namespace SeniorAssistant.Models.Data
+{
+    public class Heartbeat : IHasTime
+    {
+        [PrimaryKey]
+        [NotNull]
+        public string Username { get; set; }
+
+        [PrimaryKey]
+        [NotNull]
+        public DateTime Time { get; set; }
+
+        public double Value { get; set; }
+    }
+}

SeniorAssistant/Models/Data/Sleep.cs

@@ -0,0 +1,18 @@
+using LinqToDB.Mapping;
+using System;
+
+namespace SeniorAssistant.Models.Data
+{
+    public class Sleep : IHasTime
+    {
+        [PrimaryKey]
+        [NotNull]
+        public string Username { get; set; }
+
+        [PrimaryKey]
+        [NotNull]
+        public DateTime Time { get; set; }
+
+        public long Value { get; set; }
+    }
+}

SeniorAssistant/Models/Data/Step.cs

@@ -0,0 +1,18 @@
+using LinqToDB.Mapping;
+using System;
+
+namespace SeniorAssistant.Models.Data
+{
+    public class Step : IHasTime
+    {
+        [PrimaryKey]
+        [NotNull]
+        public string Username { get; set; }
+
+        [PrimaryKey]
+        [NotNull]
+        public DateTime Time { get; set; }
+        
+        public long Value { get; set; }
+    }
+}