TemplateService. !!!Ошибка записи в БД

PARR.DAL/Services/Implementations/TemplateService.cs

@@ -21,5 +21,10 @@ namespace PARR.DAL.Services.Implementations
             this.dataContext = dataContext;
             this.logger = logger;
         }
+
+        public async Task<Template?> GetTemplateByNameAsync(string name)
+        {
+            return await EntitySet.FirstOrDefaultAsync(t => t.EK == name);
+        }
     }
 }

PARR.DAL/Services/Interfaces/ITemplateService.cs

@@ -5,5 +5,6 @@ namespace PARR.DAL.Services.Interfaces
 {
     public interface ITemplateService : IBaseService<Template>
     {
+        Task<Template?> GetTemplateByNameAsync(string name);
     }
 }