updating countries

SchengenVisaApi/ApplicationLayer/Services/GeneralExceptions/EntityNotFoundByIdException.cs

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+using Domains;
+
+namespace Infrastructure.Database.GeneralExceptions;
+
+/// Exception to throw when entity not found
+/// <param name="id">Identifier of entity</param>
+/// <typeparam name="T">Type of entity</typeparam>
+public class EntityNotFoundByIdException<T>(Guid id) : EntityNotFoundException<T>($"{typeof(T).Name} with id {id} not found.")
+    where T : class, IEntity;

SchengenVisaApi/ApplicationLayer/Services/GeneralExceptions/EntityNotFoundException.cs

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+using ApplicationLayer.GeneralExceptions;
+using Domains;
+
+namespace Infrastructure.Database.GeneralExceptions;
+
+/// Exception to throw when entity not found
+/// <typeparam name="T">Not found entity type</typeparam>
+public class EntityNotFoundException<T>(string message) : ApiException(message)
+    where T : class, IEntity;

SchengenVisaApi/ApplicationLayer/Services/GeneralExceptions/EntityUsedInDatabaseException.cs

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+using ApplicationLayer.GeneralExceptions;
+
+namespace Infrastructure.Database.GeneralExceptions
+{
+    /// Exception to throw when can't complete some action on entity(delete or something) because it's needed for other entities
+    public class EntityUsedInDatabaseException(string message) : ApiException(message);
+}