Fix expense/income creation

src/main/java/com/faf223/expensetrackerfaf/dto/ExpenseDTO.java

@@ -1,6 +1,7 @@
 package com.faf223.expensetrackerfaf.dto;
 
 import com.faf223.expensetrackerfaf.model.ExpenseCategory;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import lombok.AllArgsConstructor;
 import lombok.Data;
 
@@ -9,10 +10,11 @@ import java.time.LocalDate;
 
 @Data
 @AllArgsConstructor
+@JsonIgnoreProperties({"expenseCategory"})
 public class ExpenseDTO {
     private long expenseId;
     private UserDTO userDTO;
     private ExpenseCategory expenseCategory;
     private LocalDate date;
     private BigDecimal amount;
-}
+}