Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

Infrastructure/Database/Generic/GenericRepository.cs

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+using ApplicationLayer.GeneralExceptions;
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using Microsoft.EntityFrameworkCore;
+
+namespace Infrastructure.Database.Generic;
+
+/// Generic repository pattern
+/// <param name="writer"><inheritdoc cref="IGenericWriter"/></param>
+/// <typeparam name="T">Type of entity</typeparam>
+/// <remarks>Should be inherited to create typed repositories</remarks>
+public abstract class GenericRepository<T>(IGenericReader reader, IGenericWriter writer) : IGenericRepository<T>
+    where T : class, IEntity
+{
+    /// <inheritdoc cref="IGenericRepository{T}.GetAllAsync"/>
+    public async Task<List<T>> GetAllAsync(CancellationToken cancellationToken)
+        => await LoadDomain().ToListAsync(cancellationToken);
+
+    /// <inheritdoc cref="IGenericRepository{T}.GetByIdAsync"/>
+    public async Task<T> GetByIdAsync(Guid id, CancellationToken cancellationToken)
+    {
+        var result = await LoadDomain().SingleOrDefaultAsync(a => a.Id == id, cancellationToken);
+        return result ?? throw new EntityNotFoundByIdException<T>(id);
+    }
+
+    /// <inheritdoc cref="IGenericRepository{T}.AddAsync"/>
+    public async Task AddAsync(T entity, CancellationToken cancellationToken)
+        => await writer.AddAsync(entity, cancellationToken);
+
+    /// <inheritdoc cref="IGenericRepository{T}.UpdateAsync"/>
+    public async Task UpdateAsync(T entity, CancellationToken cancellationToken)
+    {
+        await GetByIdAsync(entity.Id, cancellationToken);
+        writer.Update(entity);
+    }
+
+    /// <inheritdoc cref="IGenericRepository{T}.Remove"/>
+    public void Remove(T entity)
+    {
+        writer.Remove(entity);
+    }
+
+    /// Should be overriden to load navigation properties of entity
+    protected virtual IQueryable<T> LoadDomain()
+    {
+        return reader.GetAll<T>();
+    }
+}