feat: Adjust json responses

backend/src/main/java/de/szut/casino/blackjack/CardEntity.java

@@ -1,15 +1,33 @@
 package de.szut.casino.blackjack;
 
 
+import com.fasterxml.jackson.annotation.JsonBackReference;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
 import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
 
+@Entity
 @Getter
+@Setter
+@AllArgsConstructor
+@NoArgsConstructor
 public class CardEntity {
-    private final Suit suit;
-    private final Rank rank;
+    @Id
+    @GeneratedValue
+    @JsonIgnore
+    private Long id;
 
-    public CardEntity(Suit suit, Rank rank) {
-        this.suit = suit;
-        this.rank = rank;
-    }
+    @ManyToOne
+    @JoinColumn(name = "game_id", nullable = false)
+    @JsonBackReference
+    private BlackJackGameEntity game;
+
+    @Enumerated(EnumType.STRING)
+    private Suit suit;
+
+    @Enumerated(EnumType.STRING)
+    private Rank rank;
 }