Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

Infrastructure/DependencyInjection.cs

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+using System.Reflection;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using ApplicationLayer.Services.Applicants.NeededServices;
+using ApplicationLayer.Services.AuthServices.NeededServices;
+using ApplicationLayer.Services.VisaApplications.NeededServices;
+using Infrastructure.Common;
+using Infrastructure.Database;
+using Infrastructure.Database.Applicants.Repositories;
+using Infrastructure.Database.Generic;
+using Infrastructure.Database.Users.Repositories;
+using Infrastructure.Database.VisaApplications.Repositories;
+using Infrastructure.EntityToExcelTemplateWriter;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Infrastructure;
+
+/// Provides methods to add services to DI-container
+public static class DependencyInjection
+{
+    /// Add services needed for Infrastructure layer
+    public static IServiceCollection AddInfrastructure(this IServiceCollection services,
+        IConfigurationManager configurationManager)
+    {
+
+        services.AddDbContext<DatabaseContext>(opts =>
+            opts.UseNpgsql(configurationManager.GetConnectionString("connectionString")));
+
+        services.AddScoped<IGenericReader>(serviceProvider => serviceProvider.GetRequiredService<DatabaseContext>());
+        services.AddScoped<IGenericWriter>(serviceProvider => serviceProvider.GetRequiredService<DatabaseContext>());
+        services.AddScoped<IUnitOfWork>(serviceProvider => serviceProvider.GetRequiredService<DatabaseContext>());
+
+        services.AddScoped<IApplicantsRepository, ApplicantsRepository>();
+        services.AddScoped<IVisaApplicationsRepository, VisaApplicationsRepository>();
+        services.AddScoped<IUsersRepository, UsersRepository>();
+
+        services.AddSingleton<IDateTimeProvider, DateTimeProvider>();
+        services.AddSingleton<IEntityWriter, ExcelWriter>();
+
+        services.AddHttpContextAccessor();
+        services.AddScoped<IUserIdProvider, UserIdProvider>();
+
+        services.AddAutoMapper(Assembly.GetExecutingAssembly());
+
+        return services;
+    }
+}