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Back/Data/Models/PermissionPeriod.cs

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+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace  Back.Data.Models
+{
+    [PrimaryKey("CompanyID", "PermissionID", "CalculationTypeID")]
+    public class PermissionPeriod
+    {
+        public int CompanyID { get; set; }
+        public int PermissionID { get; set; }
+        public int TotalAmount { get; set; }
+        public int RemainingAmount { get; set; }
+        public int CalculationTypeID { get; set; }
+        public bool? IsLocked { get; set; }
+
+        #region Navigation
+        [ForeignKey("CompanyID")]
+        public virtual Company Company { get; set; }
+        [ForeignKey("PermissionID")]
+        public virtual Permission Permission { get; set; }
+        [ForeignKey("CalculationTypeID")]
+        public virtual CalculationType CalculationType { get; set; }
+        #endregion
+    }
+}