Handle events.

Calculate targetn.

FarmmapsApi/Models/EventMessage.cs

@@ -0,0 +1,12 @@
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+
+namespace FarmmapsApi.Models
+{
+    public class EventMessage
+    {
+        public string EventType { get; set; }
+        public string ItemCode { get; set; }
+        public Dictionary<string, string> Attributes { get; set; }
+    }
+}

FarmmapsApi/Models/ItemRequest.cs

@@ -15,6 +15,7 @@ namespace FarmmapsApi.Models
         public string ItemType { get; set; }
         public string Name { get; set; }
         public DateTime? DataDate { get; set; }
+        public DateTime? DataEndDate { get; set; }
         public JObject Geometry { get; set; }
         public JObject Data { get; set; }
         public IList<string> Tags { get; set; }

FarmmapsApi/Models/TaskRequest.cs

@@ -7,11 +7,11 @@ namespace FarmmapsApi.Models
         public string TaskType { get; set; }
         public string Delay { get; set; }
         
-        public Dictionary<string, string> attributes { get; set; }
+        public Dictionary<string, string> attributes { get; }
 
         public TaskRequest()
         {
-            this.attributes = new Dictionary<string, string>();
+            attributes = new Dictionary<string, string>();
         }
     }
 }