Add repositories

src/Printbase.Infrastructure/Repositories/ProductVariantRepository.cs

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+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Printbase.Domain.Entities.Products;
+using Printbase.Domain.Repositories;
+using Printbase.Infrastructure.Database;
+using Printbase.Infrastructure.DbEntities.Products;
+
+namespace Printbase.Infrastructure.Repositories;
+
+public class ProductVariantRepository(ApplicationDbContext dbContext, IMapper mapper) : IProductVariantRepository
+{
+    private readonly ApplicationDbContext _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
+    private readonly IMapper _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
+
+    public async Task<ProductVariant?> GetByIdAsync(Guid id, CancellationToken cancellationToken = default)
+    {
+        var dbEntity = await _dbContext.Set<ProductVariantDbEntity>()
+            .FirstOrDefaultAsync(v => v.Id == id, cancellationToken);
+        
+        return dbEntity != null ? _mapper.Map<ProductVariant>(dbEntity) : null;
+    }
+
+    public async Task<IEnumerable<ProductVariant>> GetByProductIdAsync(Guid productId, CancellationToken cancellationToken = default)
+    {
+        var dbEntities = await _dbContext.Set<ProductVariantDbEntity>()
+            .Where(v => v.ProductId == productId)
+            .ToListAsync(cancellationToken);
+        
+        return _mapper.Map<IEnumerable<ProductVariant>>(dbEntities);
+    }
+
+    public async Task<bool> ExistsAsync(Guid id, CancellationToken cancellationToken = default)
+    {
+        return await _dbContext.Set<ProductVariantDbEntity>()
+            .AnyAsync(v => v.Id == id, cancellationToken);
+    }
+
+    public async Task AddAsync(ProductVariant productVariant, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(productVariant);
+        
+        var dbEntity = _mapper.Map<ProductVariantDbEntity>(productVariant);
+        await _dbContext.Set<ProductVariantDbEntity>().AddAsync(dbEntity, cancellationToken);
+        await _dbContext.SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task UpdateAsync(ProductVariant productVariant, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(productVariant);
+        
+        var dbEntity = await _dbContext.Set<ProductVariantDbEntity>()
+            .FirstOrDefaultAsync(v => v.Id == productVariant.Id, cancellationToken);
+        
+        if (dbEntity == null)
+            throw new KeyNotFoundException($"ProductVariant with ID {productVariant.Id} not found");
+        
+        _mapper.Map(productVariant, dbEntity);
+        await _dbContext.SaveChangesAsync(cancellationToken);
+    }
+
+    public async Task DeleteAsync(Guid id, CancellationToken cancellationToken = default)
+    {
+        var dbEntity = await _dbContext.Set<ProductVariantDbEntity>()
+            .FindAsync([id], cancellationToken);
+        
+        if (dbEntity == null)
+            return;
+        
+        _dbContext.Set<ProductVariantDbEntity>().Remove(dbEntity);
+        await _dbContext.SaveChangesAsync(cancellationToken);
+    }
+}