refactor: Change balance type to bigdecimal for better precision

backend/requests/user.http

@@ -16,3 +16,12 @@ Authorization: Bearer {{token}}
   "username": "john.doe"
 }
 
+### Deposit
+POST http://localhost:8080/deposit/checkout
+Content-Type: application/json
+Origin: http://localhost:8080
+Authorization: Bearer {{token}}
+
+{
+  "amount": 60.12
+}

backend/src/main/java/de/szut/casino/user/UserEntity.java

@@ -8,6 +8,7 @@ import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
+import java.math.BigDecimal;
 
 @Setter
 @Getter
@@ -20,9 +21,11 @@ public class UserEntity {
     @Column(unique = true)
     private String keycloakId;
     private String username;
-    private float balance;
 
-    public UserEntity(String keycloakId, String username, float balance) {
+    @Column(precision = 19, scale = 2)
+    private BigDecimal balance;
+
+    public UserEntity(String keycloakId, String username, BigDecimal balance) {
         this.keycloakId = keycloakId;
         this.username = username;
         this.balance = balance;

backend/src/main/java/de/szut/casino/user/UserMappingService.java

@@ -4,6 +4,8 @@ import de.szut.casino.user.dto.CreateUserDto;
 import de.szut.casino.user.dto.GetUserDto;
 import org.springframework.stereotype.Service;
 
+import java.math.BigDecimal;
+
 @Service
 public class UserMappingService {
     public GetUserDto mapToGetUserDto(UserEntity user) {
@@ -11,7 +13,6 @@ public class UserMappingService {
     }
 
     public UserEntity mapToUserEntity(CreateUserDto createUserDto) {
-        return new UserEntity(createUserDto.getKeycloakId(), createUserDto.getUsername(), 0);
-    }
+        return new UserEntity(createUserDto.getKeycloakId(), createUserDto.getUsername(), BigDecimal.ZERO);    }
 }
 

backend/src/main/java/de/szut/casino/user/dto/GetUserDto.java

@@ -5,6 +5,8 @@ import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
 
+import java.math.BigDecimal;
+
 @Getter
 @Setter
 @AllArgsConstructor
@@ -12,5 +14,5 @@ import lombok.Setter;
 public class GetUserDto {
     private String keycloakId;
     private String username;
-    private float balance;
+    private BigDecimal balance;
 }

frontend/src/app/service/user.service.ts

@@ -21,10 +21,11 @@ export class UserService {
     });
   }
 
-  public async getOrCreateUser(userProfile: KeycloakProfile) {
+  public async getOrCreateUser(userProfile: KeycloakProfile): Promise<User | undefined | null> {
     if (userProfile.id == null) {
-      return;
+      return null;
     }
+
     return await this.getUser(userProfile.id)
       .toPromise()
       .then(async (user) => {