diff --git a/.gitignore b/.gitignore
index ad9a362..61101b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -397,4 +397,3 @@ FodyWeavers.xsd
 # JetBrains Rider
 *.sln.iml
 src/Recruitment.Tool.xml
-/Francesco.Recipes.World/Migrations/20250304095839_AddFewNewBackendModels.Designer.cs
diff --git a/Francesco.Recipes.World/Controllers/Favorit/FavoritController.cs b/Francesco.Recipes.World/Controllers/Favorit/FavoritController.cs
new file mode 100644
index 0000000..7d66c1f
--- /dev/null
+++ b/Francesco.Recipes.World/Controllers/Favorit/FavoritController.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Controllers.Favorit
+{
+    public class FavoritController
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Controllers/Ingredient/IngredientController.cs b/Francesco.Recipes.World/Controllers/Ingredient/IngredientController.cs
new file mode 100644
index 0000000..187acb8
--- /dev/null
+++ b/Francesco.Recipes.World/Controllers/Ingredient/IngredientController.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Controllers.Ingredient
+{
+    public class IngredientController
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Controllers/Instruction/InstructionController.cs b/Francesco.Recipes.World/Controllers/Instruction/InstructionController.cs
new file mode 100644
index 0000000..17c9b8d
--- /dev/null
+++ b/Francesco.Recipes.World/Controllers/Instruction/InstructionController.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Controllers.Instruction
+{
+    public class InstructionController
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Controllers/MediaFile/MediaFilesController.cs b/Francesco.Recipes.World/Controllers/MediaFile/MediaFilesController.cs
new file mode 100644
index 0000000..d17c5fd
--- /dev/null
+++ b/Francesco.Recipes.World/Controllers/MediaFile/MediaFilesController.cs
@@ -0,0 +1,9 @@
+namespace Francesco.Recipes.World.Controllers.MediaFile
+{
+    using Microsoft.AspNetCore.Mvc;
+
+    public class MediaFilesController : Controller
+    {
+      
+    }
+}
diff --git a/Francesco.Recipes.World/Controllers/Recipe/RecipeController.cs b/Francesco.Recipes.World/Controllers/Recipe/RecipeController.cs
new file mode 100644
index 0000000..a4b93ae
--- /dev/null
+++ b/Francesco.Recipes.World/Controllers/Recipe/RecipeController.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Controllers.Recipe
+{
+    public class RecipeController
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Controllers/ShoppingList/ShoppingLIstController.cs b/Francesco.Recipes.World/Controllers/ShoppingList/ShoppingLIstController.cs
new file mode 100644
index 0000000..03e77c6
--- /dev/null
+++ b/Francesco.Recipes.World/Controllers/ShoppingList/ShoppingLIstController.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Controllers.ShoppingList
+{
+    public class ShoppingLIstController
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/FrancescosRecipesWorldDbContext.cs b/Francesco.Recipes.World/Data/FrancescosRecipesWorldDbContext.cs
index fe4646e..e27bf78 100644
--- a/Francesco.Recipes.World/Data/FrancescosRecipesWorldDbContext.cs
+++ b/Francesco.Recipes.World/Data/FrancescosRecipesWorldDbContext.cs
@@ -1,25 +1,108 @@
-namespace Francesco.Recipes.World.Data
-{
-    using Francesco.Recipes.World.Models.BackendModels.Category;
+namespace Francesco.Recipes.World.Data;
+
+using System.Runtime.CompilerServices;
+using Francesco.Recipes.World.Models.BackendModels;
+using Francesco.Recipes.World.Models.BackendModels.Category;
+    using Francesco.Recipes.World.Models.BackendModels.Favorit;
     using Francesco.Recipes.World.Models.BackendModels.Ingredient;
+    using Francesco.Recipes.World.Models.BackendModels.IngredientShoppingList;
     using Francesco.Recipes.World.Models.BackendModels.Instruction;
+    using Francesco.Recipes.World.Models.BackendModels.MediaFile;
     using Francesco.Recipes.World.Models.BackendModels.Recipe;
     using Francesco.Recipes.World.Models.BackendModels.RecipeIngredient;
+    using Francesco.Recipes.World.Models.BackendModels.Shoppinglist;
     using Francesco.Recipes.World.Models.BackendModels.Unit;
-    using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
 
-    public class FrancescosRecipesWorldDbContext : DbContext
+public class FrancescosRecipesWorldDbContext : DbContext
+{
+    public FrancescosRecipesWorldDbContext(DbContextOptions<FrancescosRecipesWorldDbContext> options)
+        : base(options)
     {
-        public FrancescosRecipesWorldDbContext(DbContextOptions<FrancescosRecipesWorldDbContext> options) 
-            : base(options) 
-        { 
+    }
+
+    public DbSet<Category> Categories => Set<Category>();
+    public DbSet<Ingredient> Ingredients => Set<Ingredient>();
+    public DbSet<Instruction> Instructions => Set<Instruction>();
+    public DbSet<Recipe> Recipes => Set<Recipe>();
+    public DbSet<RecipeIngredient> RecipeIngredients => Set<RecipeIngredient>();
+    public DbSet<Unit> Units => Set<Unit>();
+    public DbSet<Favorit> Favorits => Set<Favorit>();
+    public DbSet<IngredientsShoppingList> IngredientsShoppingLists => Set<IngredientsShoppingList>();
+    public DbSet<ShoppingList> ShoppingLists => Set<ShoppingList>();
+    public DbSet<MediaFile> MediaFiles => Set<MediaFile>();
+    public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
+    {
+        foreach (var entry in ChangeTracker.Entries())
+        {
+            if (entry.Entity is ITimeStampedEntity timeStampedEntity)
+            {
+                switch (entry.State)
+                {
+                    case EntityState.Added:
+                        timeStampedEntity.CreatedAt = DateTime.UtcNow;
+                        break;
+                    case EntityState.Modified:
+                        timeStampedEntity.ModifiedAt = DateTime.UtcNow;
+                        break;
+                }
+            }
         }
 
-        public DbSet<Category> Categories => Set<Category>();
-        public DbSet<Ingredient> Ingredients => Set<Ingredient>();
-        public DbSet<Instruction> Instructions => Set<Instruction>();
-        public DbSet<Recipe> Recipes => Set<Recipe>();
-        public DbSet<RecipeIngredient> RecipeIngredients => Set<RecipeIngredient>();
-        public DbSet<Unit> Units => Set<Unit>();
+        return base.SaveChangesAsync(cancellationToken);
+    }
+    protected override void OnModelCreating(ModelBuilder builder)
+    {
+        if (builder is null)
+        {
+            throw new ArgumentNullException(nameof(builder));
+        }
+
+        SeedData(builder);
+
+        base.OnModelCreating(builder);
+    }
+
+    private static void SeedData(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Category>()
+           .HasData(GetCategories());
+
+        modelBuilder.Entity<Unit>()
+            .HasData(GetUnits());
+    }
+    private static IEnumerable<Category> GetCategories()
+    {
+        return new List<Category>()
+        {
+            new Category { Id = Guid.Parse("b248244f-f21c-4555-a14d-5dd49a2717cf"), Name = "Vorspeisen & Snacks" },
+            new Category { Id = Guid.Parse("5186c5d6-5aff-4a6e-baf4-b61b72d889fe"), Name = "Erste Gänge" },
+            new Category { Id = Guid.Parse("abbc6bb0-97ea-49f5-b31e-6507eb784fd1"), Name = "Hauptgerichte" },
+            new Category { Id = Guid.Parse("90deec39-dcd0-422d-9018-ac8389e332e1"), Name = "Desserts & Süßspeisen" },
+            new Category { Id = Guid.Parse("28e39168-701a-4084-81da-d96c987c462f"), Name = "Beilagen & Salate" },
+            new Category { Id = Guid.Parse("20585b74-4805-4aff-a6df-aa6b7af04ff1"), Name = "Kuchen" },
+            new Category { Id = Guid.Parse("adfb75ce-3ef3-428b-a5ca-b0c4c619d5ec"), Name = "Hefegebäck & Brot" },
+            new Category { Id = Guid.Parse("d332f88d-d241-48c5-a2f2-bfd124eada7e"), Name = "Soßen & Saucen" },
+            new Category { Id = Guid.Parse("23b1c740-e427-44f9-a6ea-d33d3f30f05a"), Name = "Marmeladen & Eingemachtes" },
+            new Category { Id = Guid.Parse("0a91a200-dc76-4e00-b38c-b38cab5b69d7"), Name = "Getränke" },
+        };
+    }
+
+    private static IEnumerable<Unit> GetUnits()
+    {
+        return new List<Unit>()
+        {
+            new Unit { Id = Guid.Parse("62eb2c11-8768-46fb-9db0-c77f940bb4aa"), Name = "liter", Symbol = "l" },
+            new Unit { Id = Guid.Parse("6c41f7e6-ca75-49cc-8541-cebd5a9c560b"), Name = "gramm", Symbol = "g" },
+            new Unit { Id = Guid.Parse("7e3d1b86-ac48-45d6-814e-d3492a86db1d"), Name = "kilogramm", Symbol = "kg" },
+            new Unit { Id = Guid.Parse("0c3648ec-4981-42c8-abf8-18bf1a2ff4c2"), Name = "stücke", Symbol = "stk" },
+            new Unit { Id = Guid.Parse("d82f4abd-e4e4-4104-a9c0-1acdeaa701f5"), Name = "blatt", Symbol = "blatt" },
+            new Unit { Id = Guid.Parse("df5cb4c3-4de6-4c6f-be8c-da41b2986408"), Name = "messerspitze", Symbol = "msp" },
+            new Unit { Id = Guid.Parse("e45a3af2-2ed6-4ac4-b06f-b4175663a7be"), Name = "stange", Symbol = "stange" },
+            new Unit { Id = Guid.Parse("7ea2f51d-7493-4f19-a663-1f309186d3ae"), Name = "bund", Symbol = "bund" },
+            new Unit { Id = Guid.Parse("66556e0e-eb2b-4bc3-9a56-135dd508ed09"), Name = "zehe", Symbol = "zehe" },
+            new Unit { Id = Guid.Parse("2e9894ac-14fa-43fd-ba07-35cdd8ebd461"), Name = "teelöffel", Symbol = "TL" },
+            new Unit { Id = Guid.Parse("24a91b89-3389-4465-89e4-2f70d2ea6fd7"), Name = "esslöffel", Symbol = "EL" },
+        };
     }
 }
diff --git a/Francesco.Recipes.World/Data/Repository/Category/CategoryRepository.cs b/Francesco.Recipes.World/Data/Repository/Category/CategoryRepository.cs
new file mode 100644
index 0000000..60e0775
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Category/CategoryRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Category
+{
+    public class CategoryRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Category/ICategoryRepository.cs b/Francesco.Recipes.World/Data/Repository/Category/ICategoryRepository.cs
new file mode 100644
index 0000000..cfd14f4
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Category/ICategoryRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Category
+{
+    public interface ICategoryRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/ErrorViewModel.cs b/Francesco.Recipes.World/Data/Repository/ErrorViewModel.cs
new file mode 100644
index 0000000..1f2259d
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/ErrorViewModel.cs
@@ -0,0 +1,9 @@
+namespace Francesco.Recipes.World.Data.Repository
+{
+    public class ErrorViewModel
+    {
+        public string? RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Favorit/FavoritRepository.cs b/Francesco.Recipes.World/Data/Repository/Favorit/FavoritRepository.cs
new file mode 100644
index 0000000..3292412
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Favorit/FavoritRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Favorit
+{
+    public class FavoritRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Favorit/IFavoritRepository.cs b/Francesco.Recipes.World/Data/Repository/Favorit/IFavoritRepository.cs
new file mode 100644
index 0000000..1691bb0
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Favorit/IFavoritRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Favorit
+{
+    public interface IFavoritRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Ingredient/IIngredientRepository.cs b/Francesco.Recipes.World/Data/Repository/Ingredient/IIngredientRepository.cs
new file mode 100644
index 0000000..a24cb71
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Ingredient/IIngredientRepository.cs
@@ -0,0 +1,17 @@
+namespace FrancescoRecipesWorld.Repositories
+{
+    using Francesco.Recipes.World.Models.BackendModels.Ingredient;
+    using Francesco.Recipes.World.Models.BackendModels.Recipe;
+
+    public interface IIngredientRepository
+    {
+        Task<Ingredient> CreateIngredientToRecipeAsync(int recipeId, string ingredientName);
+        Task UpdateIngredientAsync(Ingredient ingredient);
+        Task<List<Ingredient>> GetIngredientsByRecipeIdAsync(Guid recipeId);
+        Task<List<Recipe>> GetRecipesByIngredientIdAsync(Guid ingredientId);
+        Task<List<Ingredient>> GetIngredientsByNameAsync(string name);
+        Task RemoveIngredientFromRecipeAsync(Recipe recipe, Guid ingredientId);
+        Task<Ingredient> GetIngredientByIdAsync(Guid ingredientId);
+
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Ingredient/IngredientRepository.cs b/Francesco.Recipes.World/Data/Repository/Ingredient/IngredientRepository.cs
new file mode 100644
index 0000000..4d32131
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Ingredient/IngredientRepository.cs
@@ -0,0 +1,66 @@
+namespace FrancescoRecipesWorld.Repositories
+{
+    using Francesco.Recipes.World.Data;
+    using Francesco.Recipes.World.Models.BackendModels.Ingredient;
+    using Francesco.Recipes.World.Models.BackendModels.Recipe;
+
+    public class IngredientRepository : IIngredientRepository
+    {
+        private readonly FrancescosRecipesWorldDbContext _context;
+        private readonly RecipeRepository _recipeRepository;
+        public IngredientRepository(
+            FrancescosRecipesWorldDbContext context, RecipeRepository recipeRepository)
+        {
+            _context = context;
+            _recipeRepository = recipeRepository;
+        }
+
+        public async Task<Ingredient> CreateIngredientToRecipeAsync(int recipeId, string ingredientName)
+        {
+            var recipe = await _context.Recipes.FindAsync(recipeId);
+            if (recipe == null)
+            {
+                throw new ArgumentException("Recipe not found", nameof(recipeId));
+            }
+
+            var newIngredient = new Ingredient
+            {
+                Name = ingredientName,
+            };
+            _context.Ingredients.Add(newIngredient);
+            await _context.SaveChangesAsync();
+            return newIngredient;
+        }
+
+        public Task RemoveIngredientFromRecipeAsync(Recipe recipe, Guid ingredientId)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task<List<Ingredient>> GetIngredientsByNameAsync(string name)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task<List<Ingredient>> GetIngredientsByRecipeIdAsync(Guid recipeId)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task<List<Recipe>> GetRecipesByIngredientIdAsync(Guid ingredientId)
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task UpdateIngredientAsync(Ingredient ingredient)
+        {
+            throw new NotImplementedException();
+        }
+
+        public async Task<Ingredient> GetIngredientByIdAsync(Guid ingredientId)
+        {
+            var ingredient = await _context.Ingredients.FindAsync(ingredientId);
+            return ingredient ?? throw new InvalidDataException($"Address {ingredientId} not found.");
+        }
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Instruction/IInstructionsRepository.cs b/Francesco.Recipes.World/Data/Repository/Instruction/IInstructionsRepository.cs
new file mode 100644
index 0000000..9eb5c68
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Instruction/IInstructionsRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Instruction
+{
+    public interface IInstructionsRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Instruction/InstructionsRepository.cs b/Francesco.Recipes.World/Data/Repository/Instruction/InstructionsRepository.cs
new file mode 100644
index 0000000..7306bb2
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Instruction/InstructionsRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Instruction
+{
+    public class InstructionsRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/MediaFile/IMediaFileRepository.cs b/Francesco.Recipes.World/Data/Repository/MediaFile/IMediaFileRepository.cs
new file mode 100644
index 0000000..e8c1058
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/MediaFile/IMediaFileRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.MediaFile
+{
+    public interface IMEdiaFileRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/MediaFile/MediaFileRepository.cs b/Francesco.Recipes.World/Data/Repository/MediaFile/MediaFileRepository.cs
new file mode 100644
index 0000000..0c3490e
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/MediaFile/MediaFileRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.MediaFile
+{
+    public class MediaFileRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Recipe/IRecipeRepository.cs b/Francesco.Recipes.World/Data/Repository/Recipe/IRecipeRepository.cs
new file mode 100644
index 0000000..cd4e97b
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Recipe/IRecipeRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Recipe
+{
+    public interface IRecipeRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Recipe/RecipeRepository.cs b/Francesco.Recipes.World/Data/Repository/Recipe/RecipeRepository.cs
new file mode 100644
index 0000000..bd57464
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Recipe/RecipeRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Recipe
+{
+    public class RecipeRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/ShoppingLIst/IShoppingListRepository.cs b/Francesco.Recipes.World/Data/Repository/ShoppingLIst/IShoppingListRepository.cs
new file mode 100644
index 0000000..c7e3943
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/ShoppingLIst/IShoppingListRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.ShoppingLIst
+{
+    public interface IShoppingListRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/ShoppingLIst/ShoppingListRepository.cs b/Francesco.Recipes.World/Data/Repository/ShoppingLIst/ShoppingListRepository.cs
new file mode 100644
index 0000000..5b0c2cb
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/ShoppingLIst/ShoppingListRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.ShoppingLIst
+{
+    public class ShoppingListRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Unit/IUnitRepository.cs b/Francesco.Recipes.World/Data/Repository/Unit/IUnitRepository.cs
new file mode 100644
index 0000000..443f0b1
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Unit/IUnitRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Unit
+{
+    public interface IUnitRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Data/Repository/Unit/UnitRepository.cs b/Francesco.Recipes.World/Data/Repository/Unit/UnitRepository.cs
new file mode 100644
index 0000000..ab66777
--- /dev/null
+++ b/Francesco.Recipes.World/Data/Repository/Unit/UnitRepository.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Unit
+{
+    public class UnitRepository
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Francesco.Recipes.World.csproj b/Francesco.Recipes.World/Francesco.Recipes.World.csproj
index f9e0493..fff88d5 100644
--- a/Francesco.Recipes.World/Francesco.Recipes.World.csproj
+++ b/Francesco.Recipes.World/Francesco.Recipes.World.csproj
@@ -25,6 +25,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="8.0.7" />
     <PackageReference Include="SecurityCodeScan.VS2019" Version="5.6.7">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
@@ -38,4 +39,8 @@
     </PackageReference>
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Migrations\" />
+  </ItemGroup>
+
 </Project>
diff --git a/Francesco.Recipes.World/Models/BackendModels/Category/Category.cs b/Francesco.Recipes.World/Models/BackendModels/Category/Category.cs
index 64934a2..5fa42d4 100644
--- a/Francesco.Recipes.World/Models/BackendModels/Category/Category.cs
+++ b/Francesco.Recipes.World/Models/BackendModels/Category/Category.cs
@@ -4,7 +4,7 @@
     public class Category
     {
         public Guid Id { get; set; }
-        public string? Name { get; set; }
+        public string Name { get; set; }
         public virtual ICollection<Recipe> Recipes { get; set; } = new List<Recipe>();
     }
 }
diff --git a/Francesco.Recipes.World/Models/BackendModels/Unit/Unit.cs b/Francesco.Recipes.World/Models/BackendModels/Unit/Unit.cs
index 902657a..e11bce3 100644
--- a/Francesco.Recipes.World/Models/BackendModels/Unit/Unit.cs
+++ b/Francesco.Recipes.World/Models/BackendModels/Unit/Unit.cs
@@ -7,8 +7,8 @@ namespace Francesco.Recipes.World.Models.BackendModels.Unit
     public class Unit
     {
         public Guid Id{ get; set; }
-        public string? Name { get; set; }
-        public string? Symbol { get; set; }
+        public string Name { get; set; }
+        public string Symbol { get; set; }
         public virtual ICollection<RecipeIngredient> RecipeIngredient { get; set; } = new List<RecipeIngredient>();
     } 
 }
diff --git a/Francesco.Recipes.World/Services/Category/CategoryService.cs b/Francesco.Recipes.World/Services/Category/CategoryService.cs
new file mode 100644
index 0000000..df69cb8
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Category/CategoryService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Category
+{
+    public class CategoryService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/Favorit/FavoritService.cs b/Francesco.Recipes.World/Services/Favorit/FavoritService.cs
new file mode 100644
index 0000000..a37845b
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Favorit/FavoritService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Favorit
+{
+    public class FavoritService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/Ingredient/IngredientService.cs b/Francesco.Recipes.World/Services/Ingredient/IngredientService.cs
new file mode 100644
index 0000000..8bdfb20
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Ingredient/IngredientService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Data.Repository.Ingredient
+{
+    public class IngredientService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/Instruction/InstructionsService.cs b/Francesco.Recipes.World/Services/Instruction/InstructionsService.cs
new file mode 100644
index 0000000..1b156dd
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Instruction/InstructionsService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Repository.Instructions
+{
+    public class InstructionsService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/MediaFile/MediaFileService.cs b/Francesco.Recipes.World/Services/MediaFile/MediaFileService.cs
new file mode 100644
index 0000000..03c64e1
--- /dev/null
+++ b/Francesco.Recipes.World/Services/MediaFile/MediaFileService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Repository.MediaFile
+{
+    public class MediaFileService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/Recipe/RecipeService.cs b/Francesco.Recipes.World/Services/Recipe/RecipeService.cs
new file mode 100644
index 0000000..f6bc9dc
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Recipe/RecipeService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Repository.Recipe
+{
+    public class RecipeService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/ShoppingLIst/ShoppingListService.cs b/Francesco.Recipes.World/Services/ShoppingLIst/ShoppingListService.cs
new file mode 100644
index 0000000..84b68ee
--- /dev/null
+++ b/Francesco.Recipes.World/Services/ShoppingLIst/ShoppingListService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Repository.ShoppingLIst
+{
+    public class ShoppingListService
+    {
+    }
+}
diff --git a/Francesco.Recipes.World/Services/Unit/UnitService.cs b/Francesco.Recipes.World/Services/Unit/UnitService.cs
new file mode 100644
index 0000000..82c2c8d
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Unit/UnitService.cs
@@ -0,0 +1,6 @@
+namespace Francesco.Recipes.World.Repository.Unit
+{
+    public class UnitService
+    {
+    }
+}