diff --git a/Kyoo.Common/Controllers/IRepository.cs b/Kyoo.Common/Controllers/IRepository.cs
index f8c534b7..62bf0250 100644
--- a/Kyoo.Common/Controllers/IRepository.cs
+++ b/Kyoo.Common/Controllers/IRepository.cs
@@ -78,7 +78,7 @@ namespace Kyoo.Controllers
 	{
 		Task<T> Get(int id);
 		Task<T> Get(string slug);
-		async Task<T> Get(Expression<Func<T, bool>> where) => (await GetAll(where, limit: 1)).FirstOrDefault();
+		Task<T> Get(Expression<Func<T, bool>> where);
 		Task<ICollection<T>> Search(string query);
 		
 		Task<ICollection<T>> GetAll(Expression<Func<T, bool>> where = null, 
diff --git a/Kyoo.Common/Models/Resources/Studio.cs b/Kyoo.Common/Models/Resources/Studio.cs
index 8936bf66..a101c394 100644
--- a/Kyoo.Common/Models/Resources/Studio.cs
+++ b/Kyoo.Common/Models/Resources/Studio.cs
@@ -27,7 +27,7 @@ namespace Kyoo.Models
 		
 		public static Studio Default()
 		{
-			return new Studio("unknow", "Unknow Studio");
+			return new Studio("unknown", "Unknown Studio");
 		}
 	}
 }
diff --git a/Kyoo.Common/Utility.cs b/Kyoo.Common/Utility.cs
index 97f96e95..baeab0f2 100644
--- a/Kyoo.Common/Utility.cs
+++ b/Kyoo.Common/Utility.cs
@@ -5,6 +5,7 @@ using System.Globalization;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
+using System.Runtime.ExceptionServices;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
@@ -259,13 +260,21 @@ namespace Kyoo
 				return string.Empty;
 			return "?" + string.Join('&', query.Select(x => $"{x.Key}={x.Value}"));
 		}
+
+		[System.Diagnostics.CodeAnalysis.DoesNotReturn]
+		public static void ReThrow([NotNull] this Exception ex)
+		{
+			if (ex == null)
+				throw new ArgumentNullException(nameof(ex));
+			ExceptionDispatchInfo.Capture(ex).Throw();
+		}
 		
 		public static Task<T> Then<T>(this Task<T> task, Action<T> map)
 		{
 			return task.ContinueWith(x =>
 			{
 				if (x.IsFaulted)
-					throw x.Exception!.InnerException!;
+					x.Exception!.InnerException!.ReThrow();
 				if (x.IsCanceled)
 					throw new TaskCanceledException();
 				map(x.Result);
@@ -278,7 +287,7 @@ namespace Kyoo
 			return task.ContinueWith(x =>
 			{
 				if (x.IsFaulted)
-					throw x.Exception!.InnerException!;
+					x.Exception!.InnerException!.ReThrow();
 				if (x.IsCanceled)
 					throw new TaskCanceledException();
 				return map(x.Result);
@@ -290,7 +299,7 @@ namespace Kyoo
 			return task.ContinueWith(x =>
 			{
 				if (x.IsFaulted)
-					throw x.Exception!.InnerException!;
+					x.Exception!.InnerException!.ReThrow();
 				if (x.IsCanceled)
 					throw new TaskCanceledException();
 				return (T)((dynamic)x).Result;
diff --git a/Kyoo.CommonAPI/LocalRepository.cs b/Kyoo.CommonAPI/LocalRepository.cs
index c8ed3c4b..7cad6a9d 100644
--- a/Kyoo.CommonAPI/LocalRepository.cs
+++ b/Kyoo.CommonAPI/LocalRepository.cs
@@ -45,6 +45,11 @@ namespace Kyoo.Controllers
 		{
 			return Database.Set<T>().FirstOrDefaultAsync(x => x.Slug == slug);
 		}
+
+		public virtual Task<T> Get(Expression<Func<T, bool>> predicate)
+		{
+			return Database.Set<T>().FirstOrDefaultAsync(predicate);
+		}
 		
 		public virtual Task<ICollection<T>> GetAll(Expression<Func<T, bool>> where = null,
 			Sort<T> sort = default,
@@ -95,8 +100,14 @@ namespace Kyoo.Controllers
 
 			return await query.ToListAsync();
 		}
-		
-		public abstract Task<T> Create([NotNull] T obj);
+
+		public virtual async Task<T> Create([NotNull] T obj)
+		{
+			if (obj == null)
+				throw new ArgumentNullException(nameof(obj));
+			await Validate(obj);
+			return obj;
+		}
 
 		public virtual async Task<T> CreateIfNotExists(T obj)
 		{
@@ -139,6 +150,9 @@ namespace Kyoo.Controllers
 		
 		protected virtual Task Validate(T ressource)
 		{
+			if (ressource.Slug == null)
+				throw new ArgumentException("Ressource can't have null as a slug.");
+			
 			foreach (PropertyInfo property in typeof(T).GetProperties()
 				.Where(x => typeof(IEnumerable).IsAssignableFrom(x.PropertyType) 
 				            && !typeof(string).IsAssignableFrom(x.PropertyType)))
@@ -201,6 +215,11 @@ namespace Kyoo.Controllers
 			return base.Get(slug).Cast<T>();
 		}
 
+		public Task<T> Get(Expression<Func<T, bool>> predicate)
+		{
+			return Get(predicate.Convert<Func<TInternal, bool>>()).Cast<T>();
+		}
+
 		public abstract Task<ICollection<T>> Search(string query);
 		
 		public virtual Task<ICollection<T>> GetAll(Expression<Func<T, bool>> where = null,
@@ -224,8 +243,6 @@ namespace Kyoo.Controllers
 
 			return items.ToList<T>();
 		}
-		
-		public abstract override Task<TInternal> Create(TInternal obj);
 
 		Task<T> IRepository<T>.Create(T item)
 		{
diff --git a/Kyoo/Controllers/Repositories/CollectionRepository.cs b/Kyoo/Controllers/Repositories/CollectionRepository.cs
index 8d8b6175..d76cad51 100644
--- a/Kyoo/Controllers/Repositories/CollectionRepository.cs
+++ b/Kyoo/Controllers/Repositories/CollectionRepository.cs
@@ -52,9 +52,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<CollectionDE> Create(CollectionDE obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			await _database.SaveChangesAsync($"Trying to insert a duplicated collection (slug {obj.Slug} already exists).");
 			return obj;
@@ -82,7 +80,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Collection> collections = await ApplyFilters(_database.CollectionLinks
 					.Where(x => x.ShowID == showID)
-					.Select(x => x.Collection as CollectionDE),
+					.Select(x => (CollectionDE)x.Collection),
 				where,
 				sort,
 				limit);
@@ -98,7 +96,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Collection> collections = await ApplyFilters(_database.CollectionLinks
 					.Where(x => x.Show.Slug == showSlug)
-					.Select(x => x.Collection as CollectionDE),
+					.Select(x => (CollectionDE)x.Collection),
 				where,
 				sort,
 				limit);
@@ -114,7 +112,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Collection> collections = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.LibraryID == id && x.CollectionID != null)
-					.Select(x => x.Collection as CollectionDE),
+					.Select(x => (CollectionDE)x.Collection),
 				where,
 				sort,
 				limit);
@@ -130,7 +128,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Collection> collections = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.Library.Slug == slug && x.CollectionID != null)
-					.Select(x => x.Collection as CollectionDE),
+					.Select(x => (CollectionDE)x.Collection),
 				where,
 				sort,
 				limit);
diff --git a/Kyoo/Controllers/Repositories/EpisodeRepository.cs b/Kyoo/Controllers/Repositories/EpisodeRepository.cs
index 8c9e5be8..277dda98 100644
--- a/Kyoo/Controllers/Repositories/EpisodeRepository.cs
+++ b/Kyoo/Controllers/Repositories/EpisodeRepository.cs
@@ -97,10 +97,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<Episode> Create(Episode obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-			
-			await Validate(obj);
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
diff --git a/Kyoo/Controllers/Repositories/GenreRepository.cs b/Kyoo/Controllers/Repositories/GenreRepository.cs
index 5a33204b..607c2da9 100644
--- a/Kyoo/Controllers/Repositories/GenreRepository.cs
+++ b/Kyoo/Controllers/Repositories/GenreRepository.cs
@@ -47,9 +47,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<GenreDE> Create(GenreDE obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			await _database.SaveChangesAsync($"Trying to insert a duplicated genre (slug {obj.Slug} already exists).");
 			return obj;
@@ -73,7 +71,7 @@ namespace Kyoo.Controllers
 			Pagination limit = default)
 		{
 			ICollection<Genre> genres = await ApplyFilters(_database.GenreLinks.Where(x => x.ShowID == showID)
-					.Select(x => x.Genre as GenreDE),
+					.Select(x => (GenreDE)x.Genre),
 				where,
 				sort,
 				limit);
@@ -89,7 +87,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Genre> genres = await ApplyFilters(_database.GenreLinks
 					.Where(x => x.Show.Slug == showSlug)
-					.Select(x => x.Genre as GenreDE),
+					.Select(x => (GenreDE)x.Genre),
 				where,
 				sort,
 				limit);
diff --git a/Kyoo/Controllers/Repositories/LibraryRepository.cs b/Kyoo/Controllers/Repositories/LibraryRepository.cs
index a2b9dd10..66e402c6 100644
--- a/Kyoo/Controllers/Repositories/LibraryRepository.cs
+++ b/Kyoo/Controllers/Repositories/LibraryRepository.cs
@@ -52,10 +52,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<LibraryDE> Create(LibraryDE obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-
-			await Validate(obj);
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			if (obj.ProviderLinks != null)
 				foreach (ProviderLink entry in obj.ProviderLinks)
@@ -103,7 +100,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Library> libraries = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.ShowID == showID)
-					.Select(x => x.Library as LibraryDE),
+					.Select(x => (LibraryDE)x.Library),
 				where,
 				sort,
 				limit);
@@ -119,7 +116,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Library> libraries = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.Show.Slug == showSlug)
-					.Select(x => x.Library as LibraryDE),
+					.Select(x => (LibraryDE)x.Library),
 				where,
 				sort,
 				limit);
@@ -135,7 +132,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Library> libraries = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.CollectionID == id)
-					.Select(x => x.Library as LibraryDE),
+					.Select(x => (LibraryDE)x.Library),
 				where,
 				sort,
 				limit);
@@ -151,7 +148,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Library> libraries = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.Collection.Slug == slug)
-					.Select(x => x.Library as LibraryDE),
+					.Select(x => (LibraryDE)x.Library),
 				where,
 				sort,
 				limit);
diff --git a/Kyoo/Controllers/Repositories/PeopleRepository.cs b/Kyoo/Controllers/Repositories/PeopleRepository.cs
index 3dc863fd..5a36b292 100644
--- a/Kyoo/Controllers/Repositories/PeopleRepository.cs
+++ b/Kyoo/Controllers/Repositories/PeopleRepository.cs
@@ -52,10 +52,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<People> Create(People obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-			
-			await Validate(obj);
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
diff --git a/Kyoo/Controllers/Repositories/ProviderRepository.cs b/Kyoo/Controllers/Repositories/ProviderRepository.cs
index a86960ce..6219a919 100644
--- a/Kyoo/Controllers/Repositories/ProviderRepository.cs
+++ b/Kyoo/Controllers/Repositories/ProviderRepository.cs
@@ -29,11 +29,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<ProviderID> Create(ProviderID obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-			if (obj.Slug == null)
-				throw new ArgumentException($"Provider's slug can't be null (name: {obj.Name}).");
-
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 
 			await _database.SaveChangesAsync($"Trying to insert a duplicated provider (slug {obj.Slug} already exists).");
diff --git a/Kyoo/Controllers/Repositories/SeasonRepository.cs b/Kyoo/Controllers/Repositories/SeasonRepository.cs
index 4d61d34a..5d0a56d9 100644
--- a/Kyoo/Controllers/Repositories/SeasonRepository.cs
+++ b/Kyoo/Controllers/Repositories/SeasonRepository.cs
@@ -80,10 +80,7 @@ namespace Kyoo.Controllers
 		
 		public override async Task<Season> Create(Season obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-			
-			await Validate(obj);
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			if (obj.ExternalIDs != null)
 				foreach (MetadataID entry in obj.ExternalIDs)
diff --git a/Kyoo/Controllers/Repositories/ShowRepository.cs b/Kyoo/Controllers/Repositories/ShowRepository.cs
index 2810d641..b54e12ca 100644
--- a/Kyoo/Controllers/Repositories/ShowRepository.cs
+++ b/Kyoo/Controllers/Repositories/ShowRepository.cs
@@ -88,10 +88,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<ShowDE> Create(ShowDE obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-
-			await Validate(obj);
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			if (obj.GenreLinks != null)
 				foreach (GenreLink entry in obj.GenreLinks)
@@ -190,7 +187,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Show> shows = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.LibraryID == id && x.ShowID != null)
-					.Select(x => x.Show as ShowDE),
+					.Select(x => (ShowDE)x.Show),
 				where,
 				sort,
 				limit);
@@ -206,7 +203,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Show> shows = await ApplyFilters(_database.LibraryLinks
 					.Where(x => x.Library.Slug == slug && x.ShowID != null)
-					.Select(x => x.Show as ShowDE),
+					.Select(x => (ShowDE)x.Show),
 				where,
 				sort,
 				limit);
@@ -222,7 +219,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Show> shows = await ApplyFilters(_database.CollectionLinks
 					.Where(x => x.CollectionID== id)
-					.Select(x => x.Show as ShowDE),
+					.Select(x => (ShowDE)x.Show),
 				where,
 				sort,
 				limit);
@@ -238,7 +235,7 @@ namespace Kyoo.Controllers
 		{
 			ICollection<Show> shows = await ApplyFilters(_database.CollectionLinks
 					.Where(x => x.Collection.Slug == slug)
-					.Select(x => x.Show as ShowDE),
+					.Select(x => (ShowDE)x.Show),
 				where,
 				sort,
 				limit);
diff --git a/Kyoo/Controllers/Repositories/StudioRepository.cs b/Kyoo/Controllers/Repositories/StudioRepository.cs
index f9329d89..a8922f90 100644
--- a/Kyoo/Controllers/Repositories/StudioRepository.cs
+++ b/Kyoo/Controllers/Repositories/StudioRepository.cs
@@ -30,9 +30,7 @@ namespace Kyoo.Controllers
 
 		public override async Task<Studio> Create(Studio obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
 			await _database.SaveChangesAsync($"Trying to insert a duplicated studio (slug {obj.Slug} already exists).");
 			return obj;
diff --git a/Kyoo/Controllers/Repositories/TrackRepository.cs b/Kyoo/Controllers/Repositories/TrackRepository.cs
index 60c25fe7..6765309e 100644
--- a/Kyoo/Controllers/Repositories/TrackRepository.cs
+++ b/Kyoo/Controllers/Repositories/TrackRepository.cs
@@ -68,14 +68,11 @@ namespace Kyoo.Controllers
 
 		public override async Task<Track> Create(Track obj)
 		{
-			if (obj == null)
-				throw new ArgumentNullException(nameof(obj));
-
 			if (obj.EpisodeID <= 0)
 				throw new InvalidOperationException($"Can't store a track not related to any episode (episodeID: {obj.EpisodeID}).");
 
+			await base.Create(obj);
 			_database.Entry(obj).State = EntityState.Added;
-			
 			await _database.SaveChangesAsync($"Trying to insert a duplicated track (slug {obj.Slug} already exists).");
 			return obj;
 		}
diff --git a/Kyoo/Startup.cs b/Kyoo/Startup.cs
index 673431da..d6ff4004 100644
--- a/Kyoo/Startup.cs
+++ b/Kyoo/Startup.cs
@@ -46,9 +46,9 @@ namespace Kyoo
 			services.AddDbContext<DatabaseContext>(options =>
 			{
 				options.UseLazyLoadingProxies()
-					.UseNpgsql(_configuration.GetConnectionString("Database"))
-					.EnableSensitiveDataLogging()
-					.UseLoggerFactory(LoggerFactory.Create(builder => builder.AddConsole()));
+					.UseNpgsql(_configuration.GetConnectionString("Database"));
+					// .EnableSensitiveDataLogging()
+					// .UseLoggerFactory(LoggerFactory.Create(builder => builder.AddConsole()));
 			}, ServiceLifetime.Transient);
 			
 			services.AddDbContext<IdentityDatabase>(options =>