diff --git a/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameEntity.java b/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameEntity.java
index c9f57d7..4f22c9d 100644
--- a/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameEntity.java
+++ b/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameEntity.java
@@ -4,8 +4,6 @@ import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonManagedReference;
 import de.szut.casino.user.UserEntity;
 import jakarta.persistence.*;
-import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Positive;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
diff --git a/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java b/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java
index 272334d..cbdbc27 100644
--- a/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java
+++ b/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java
@@ -11,27 +11,28 @@ import org.springframework.stereotype.Service;
 
 import java.math.BigDecimal;
 import java.util.List;
+import java.util.Random;
 
 @Service
 public class BlackJackService {
     private final BlackJackGameRepository blackJackGameRepository;
     private final UserRepository userRepository;
+    private final Random random;
     private final BalanceService balanceService;
     private final UserService userService;
-    private final DeckService deckService;
 
     public BlackJackService(
             BlackJackGameRepository blackJackGameRepository,
             UserRepository userRepository,
+            Random random,
             BalanceService balanceService,
-            UserService userService,
-            DeckService deckService
+            UserService userService
     ) {
         this.blackJackGameRepository = blackJackGameRepository;
         this.userRepository = userRepository;
+        this.random = random;
         this.balanceService = balanceService;
         this.userService = userService;
-        this.deckService = deckService;
     }
 
     public BlackJackGameEntity getBlackJackGame(Long id) {
@@ -52,8 +53,8 @@ public class BlackJackService {
         game.setUser(user);
         game.setBet(betDto.getBetAmount());
 
-        this.deckService.initializeDeck(game);
-        this.deckService.dealInitialCards(game);
+        initializeDeck(game);
+        dealInitialCards(game);
 
         game.setState(getState(game));
 
@@ -66,7 +67,7 @@ public class BlackJackService {
             return game;
         }
 
-        this.deckService.dealCardToPlayer(game);
+        dealCardToPlayer(game);
         updateGameStateAndBalance(game);
 
         return processGameBasedOnState(game);
@@ -90,14 +91,14 @@ public class BlackJackService {
             return game;
         }
 
-        UserEntity user = game.getUser();
+        UserEntity user = getUserWithFreshData(game.getUser());
         BigDecimal additionalBet = game.getBet();
 
         this.balanceService.subtractFunds(user, additionalBet);
 
         game.setBet(game.getBet().add(additionalBet));
 
-        this.deckService.dealCardToPlayer(game);
+        dealCardToPlayer(game);
         updateGameStateAndBalance(game);
 
         if (game.getState() == BlackJackState.IN_PROGRESS) {
@@ -116,6 +117,36 @@ public class BlackJackService {
         return blackJackGameRepository.save(game);
     }
 
+    private UserEntity getUserWithFreshData(UserEntity user) {
+        return userRepository.findById(user.getId()).orElse(user);
+    }
+
+    private void dealInitialCards(BlackJackGameEntity game) {
+        for (int i = 0; i < 2; i++) {
+            dealCardToPlayer(game);
+        }
+
+        dealCardToDealer(game);
+    }
+
+    private void dealCardToPlayer(BlackJackGameEntity game) {
+        CardEntity card = drawCardFromDeck(game);
+        card.setCardType(CardType.PLAYER);
+        game.getPlayerCards().add(card);
+    }
+
+    private void dealCardToDealer(BlackJackGameEntity game) {
+        CardEntity card = drawCardFromDeck(game);
+        card.setCardType(CardType.DEALER);
+        game.getDealerCards().add(card);
+    }
+
+    private void dealCardsToDealerUntilMinimumScore(BlackJackGameEntity game) {
+        while (calculateHandValue(game.getDealerCards()) < 17) {
+            dealCardToDealer(game);
+        }
+    }
+
     private void updateGameStateAndBalance(BlackJackGameEntity game) {
         game.setState(getState(game));
 
@@ -143,7 +174,7 @@ public class BlackJackService {
     }
 
     protected void updateUserBalance(BlackJackGameEntity game, boolean isWin) {
-        UserEntity user = game.getUser();
+        UserEntity user = getUserWithFreshData(game.getUser());
         BigDecimal totalBet = game.getBet();
         BigDecimal balance = user.getBalance();
 
@@ -157,11 +188,34 @@ public class BlackJackService {
         userRepository.save(user);
     }
 
+    private void initializeDeck(BlackJackGameEntity game) {
+        for (Suit suit : Suit.values()) {
+            for (Rank rank : Rank.values()) {
+                CardEntity card = new CardEntity();
+                card.setGame(game);
+                card.setSuit(suit);
+                card.setRank(rank);
+                card.setCardType(CardType.DECK);
+                game.getDeck().add(card);
+            }
+        }
+
+        java.util.Collections.shuffle(game.getDeck(), random);
+    }
+
+    private CardEntity drawCardFromDeck(BlackJackGameEntity game) {
+        if (game.getDeck().isEmpty()) {
+            throw new IllegalStateException("Deck is empty");
+        }
+
+        return game.getDeck().removeFirst();
+    }
+
     private BlackJackState getState(BlackJackGameEntity game) {
         int playerHandValue = calculateHandValue(game.getPlayerCards());
 
         if (playerHandValue == 21) {
-            CardEntity hole = this.deckService.drawCardFromDeck(game);
+            CardEntity hole = drawCardFromDeck(game);
             hole.setCardType(CardType.DEALER);
             game.getDealerCards().add(hole);
 
@@ -171,7 +225,7 @@ public class BlackJackService {
                 return BlackJackState.DRAW;
             } else {
                 BigDecimal blackjackWinnings = game.getBet().multiply(new BigDecimal("1.5"));
-                UserEntity user = game.getUser();
+                UserEntity user = getUserWithFreshData(game.getUser());
                 user.setBalance(user.getBalance().add(blackjackWinnings));
                 return BlackJackState.PLAYER_BLACKJACK;
             }
@@ -199,12 +253,4 @@ public class BlackJackService {
 
         return sum;
     }
-
-    private void dealCardsToDealerUntilMinimumScore(BlackJackGameEntity game) {
-        while (calculateHandValue(game.getDealerCards()) < 17) {
-            this.deckService.dealCardToDealer(game);
-        }
-    }
 }
-
-
diff --git a/backend/src/main/java/de/szut/casino/blackjack/DeckService.java b/backend/src/main/java/de/szut/casino/blackjack/DeckService.java
deleted file mode 100644
index 0511abd..0000000
--- a/backend/src/main/java/de/szut/casino/blackjack/DeckService.java
+++ /dev/null
@@ -1,57 +0,0 @@
-package de.szut.casino.blackjack;
-
-import org.springframework.stereotype.Service;
-
-import java.util.Random;
-
-@Service
-public class DeckService {
-    private final Random random;
-
-    public DeckService(Random random) {
-        this.random = random;
-    }
-
-    public void initializeDeck(BlackJackGameEntity game) {
-        for (Suit suit : Suit.values()) {
-            for (Rank rank : Rank.values()) {
-                CardEntity card = new CardEntity();
-                card.setGame(game);
-                card.setSuit(suit);
-                card.setRank(rank);
-                card.setCardType(CardType.DECK);
-                game.getDeck().add(card);
-            }
-        }
-
-        java.util.Collections.shuffle(game.getDeck(), random);
-    }
-
-    public CardEntity drawCardFromDeck(BlackJackGameEntity game) {
-        if (game.getDeck().isEmpty()) {
-            throw new IllegalStateException("Deck is empty");
-        }
-
-        return game.getDeck().removeFirst();
-    }
-
-    public void dealInitialCards(BlackJackGameEntity game) {
-        for (int i = 0; i < 2; i++) {
-            dealCardToPlayer(game);
-        }
-
-        dealCardToDealer(game);
-    }
-
-    public void dealCardToPlayer(BlackJackGameEntity game) {
-        CardEntity card = drawCardFromDeck(game);
-        card.setCardType(CardType.PLAYER);
-        game.getPlayerCards().add(card);
-    }
-
-    public void dealCardToDealer(BlackJackGameEntity game) {
-        CardEntity card = drawCardFromDeck(game);
-        card.setCardType(CardType.DEALER);
-        game.getDealerCards().add(card);
-    }
-}
diff --git a/backend/src/main/java/de/szut/casino/user/UserEntity.java b/backend/src/main/java/de/szut/casino/user/UserEntity.java
index 534859f..c263d9c 100644
--- a/backend/src/main/java/de/szut/casino/user/UserEntity.java
+++ b/backend/src/main/java/de/szut/casino/user/UserEntity.java
@@ -16,9 +16,6 @@ public class UserEntity {
     @GeneratedValue
     private Long id;
 
-    @Version
-    private Long version;
-
     @Column(unique = true)
     private String email;
 
@@ -47,6 +44,7 @@ public class UserEntity {
         this.password = password;
         this.balance = balance;
         this.verificationToken = verificationToken;
+        this.provider = AuthProvider.LOCAL;
     }
 
     public UserEntity(String email, String username, AuthProvider provider, String providerId, BigDecimal balance) {