Added fields to maintenances model and config

Step.Model/DatabaseModels/MaintenanceModel.cs

@@ -2,6 +2,7 @@
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using static Step.Model.Constants;
 
 namespace Step.Model.DatabaseModels
 {
@@ -25,10 +26,22 @@ namespace Step.Model.DatabaseModels
         [Column("counter_id")]
         public int CounterId { get; set; }
 
+        [Column("description")]
+        public string Description { get; set; }
+
+        [Column("unit_of_measure")]
+        public MAINTENANCE_UNIT_OF_MEASURE UnitOfMeasure { get; set; }
+        
         [Column("creation_date")]
         public DateTime CreationDate { get; set; }
 
         [Column("last_expiration_date")]
         public DateTime? LastExpirationDate { get; set; }
+
+        [Column("user_id")]
+        public int? UserId { get; set; }
+
+        [ForeignKey("UserId")]
+        public UserModel User { get; set; }
     }
 }