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builder.Services.AddIndexedDbDatabase<ImageDb>(options =>
{
    var indexedDbDatabaseModel = new IndexedDbDatabaseModel
    {
        Name = "Images",
        Version = 1,
        Stores = new List<IndexedDbStore>
        {
            new BlobStore(),
            new ImageModelStore()
        },
        DbModelId = 1,
        UseKeyGenerator = false
    };

    options.UseDatabase(indexedDbDatabaseModel);
});

public class BlobStore : IndexedDbStore
{
    public BlobStore()
    {
        Name = "BlobStore";
        Key = new IndexedDbStoreParameter
        {
            //KeyPath = "Id"
        };
        Indexes = new List<IndexedDbIndex>
        {
        };
    }
}

public class ImageModelStore : IndexedDbStore
{
    public ImageModelStore()
    {
        Name = "ImageModelStore";
        Key = new IndexedDbStoreParameter
        {
            KeyPath = "id"
        };
        Indexes = new List<IndexedDbIndex>
        {
            new IndexedDbIndex
            {
                Name = "imageId",
                Definition = new IndexedDbIndexParameter
                {
                    Unique = true
                }
            },
            new IndexedDbIndex
            {
                Name = "originalName",
                Definition = new IndexedDbIndexParameter
                {
                    Unique = true
                }
            },
            new IndexedDbIndex
            {
                Name = "recordKey ",
                Definition = new IndexedDbIndexParameter
                {
                    Unique = true
                }
            },
            ...
        };
    }

public class ImageModel
{
    [IndexDbKey]
    public int? Id { get; set; }

    [IndexDbIndex]
    public Guid ImageId { get; set; } = Guid.Empty;

    [IndexDbIndex]
    public string OriginalName { get; set; } = string.Empty;

    [IndexDbIndex]
    public string RecordKey { get; set; } = string.Empty;

...
}

public async Task StoreInfo(ImageModel imageModel, byte[] content)
{
    await _imageDb.OpenIndexedDb();

    var imageInfoStore = "ImageModelStore";
    var dtoResult = await _imageDb.AddItems(imageInfoStore, [imageModel]); // [imageModel] is short for new List<ImageModel >{ imageModel }

    var blobStore = "BlobStore";
    var result = _imageDb.AddBlobItem(blobStore, content, "application/octet-stream", imageModel.RecordKey);
}

public async Task TestIndexedDb()
{
    var array = Encoding.UTF8.GetBytes("rather long test string");
    var info = new ImageModel
        {
            ImageId = Guid.NewGuid(),
            OriginalName = "best name.jpg",
            RecordKey = Guid.NewGuid().ToString().Replace("-", ""),
            Id = RandomNumberGenerator.GetInt32(100)
        };
    await StoreInfo(info, array);

    StateHasChanged();
}