надо доделать

ProjectCompRepair/ProjectCompRepair/Repositories/IMasterRepository.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using ProjectCompRepair.Entities;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ProjectCompRepair.Repositories;
+
+public interface IMasterRepository
+{
+    IEnumerable<Master> ReadMaster();
+
+    Master ReadMasterById(int id);
+
+    void CreateMaster(Master Master);
+
+    void UpdateMaster(Master master);
+
+    void DeleteMaster(int id);
+}
+