feat: 예상 수입 월별 저장 + 계좌 순서변경 API

- 예상 수입: budget_income(연·월별) 로 변경, GET/PUT 에 year·month
- 계좌: wallet.sort_order + reorder 엔드포인트, 생성 시 맨 뒤 배치

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/java/com/sb/web/account/controller/AccountController.java

@@ -10,6 +10,7 @@ import com.sb.web.account.dto.NetWorthPoint;
 import com.sb.web.account.dto.NetWorthResponse;
 import com.sb.web.account.dto.PeriodStat;
 import com.sb.web.account.dto.RepaymentRequest;
+import com.sb.web.account.dto.WalletReorderRequest;
 import com.sb.web.account.dto.WalletRequest;
 import com.sb.web.account.dto.WalletResponse;
 import com.sb.web.account.service.AccountService;
@@ -69,6 +70,14 @@ public class AccountController {
         return ResponseEntity.noContent().build();
     }
 
+    /** 계좌/카드 순서 변경 (드래그앤드랍) */
+    @PutMapping("/wallets/reorder")
+    public List<WalletResponse> reorderWallets(
+            @RequestBody WalletReorderRequest req,
+            @RequestAttribute(AuthInterceptor.CURRENT_MEMBER) SessionUser current) {
+        return accountService.reorderWallets(current.getId(), req.getType(), req.getIds());
+    }
+
     @GetMapping("/networth")
     public NetWorthResponse netWorth(
             @RequestAttribute(AuthInterceptor.CURRENT_MEMBER) SessionUser current) {

src/main/java/com/sb/web/account/controller/BudgetController.java

@@ -28,19 +28,23 @@ public class BudgetController {
     private final BudgetService budgetService;
     private final AccountSettingService settingService;
 
-    /** 월 예상 수입 조회 */
+    /** 월 예상 수입 조회 (연·월별) */
     @GetMapping("/income")
     public ExpectedIncomeRequest getIncome(
+            @RequestParam int year,
+            @RequestParam int month,
             @RequestAttribute(AuthInterceptor.CURRENT_MEMBER) SessionUser current) {
-        return new ExpectedIncomeRequest(settingService.getExpectedIncome(current.getId()));
+        return new ExpectedIncomeRequest(settingService.getExpectedIncome(current.getId(), year, month));
     }
 
-    /** 월 예상 수입 설정 */
+    /** 월 예상 수입 설정 (연·월별) */
     @PutMapping("/income")
     public ExpectedIncomeRequest setIncome(
+            @RequestParam int year,
+            @RequestParam int month,
             @Valid @RequestBody ExpectedIncomeRequest req,
             @RequestAttribute(AuthInterceptor.CURRENT_MEMBER) SessionUser current) {
-        settingService.setExpectedIncome(current.getId(), req.getExpectedIncome());
+        settingService.setExpectedIncome(current.getId(), year, month, req.getExpectedIncome());
         return req;
     }
 

src/main/java/com/sb/web/account/domain/Wallet.java

@@ -29,6 +29,7 @@ public class Wallet implements Serializable {
     private Long openingBalance;  // 초기 잔액(부호있음: 자산+, 부채-)
     private LocalDate openingDate;
     private Long currentValue;    // 현재 평가금액 (INVEST 전용, 수동 갱신)
+    private Integer sortOrder;    // 표시 순서 (타입 내 정렬)
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
 }

src/main/java/com/sb/web/account/dto/WalletReorderRequest.java

@@ -0,0 +1,15 @@
+package com.sb.web.account.dto;
+
+import lombok.Data;
+
+import java.util.List;
+
+/**
+ * 계좌/카드 순서 변경 요청. ids 순서대로 sort_order 를 재설정한다.
+ */
+@Data
+public class WalletReorderRequest {
+
+    private String type;       // BANK / CARD / LOAN / INVEST
+    private List<Long> ids;    // 새 순서의 wallet id 목록
+}

src/main/java/com/sb/web/account/mapper/AccountSettingMapper.java

@@ -4,14 +4,19 @@ import org.apache.ibatis.annotations.Mapper;
 import org.apache.ibatis.annotations.Param;
 
 /**
- * 사용자별 가계부 설정 매퍼 (account_setting).
+ * 월 예상 수입 매퍼 (budget_income, 월별).
  */
 @Mapper
 public interface AccountSettingMapper {
 
-    /** 월 예상 수입 (없으면 null) */
-    Long findExpectedIncome(@Param("memberId") Long memberId);
+    /** 해당 연·월의 예상 수입 (없으면 null) */
+    Long findExpectedIncome(@Param("memberId") Long memberId,
+                            @Param("year") int year,
+                            @Param("month") int month);
 
-    /** 월 예상 수입 upsert */
-    int upsertExpectedIncome(@Param("memberId") Long memberId, @Param("expectedIncome") Long expectedIncome);
+    /** 해당 연·월 예상 수입 upsert */
+    int upsertExpectedIncome(@Param("memberId") Long memberId,
+                             @Param("year") int year,
+                             @Param("month") int month,
+                             @Param("expectedIncome") Long expectedIncome);
 }

src/main/java/com/sb/web/account/mapper/WalletMapper.java

@@ -25,4 +25,10 @@ public interface WalletMapper {
     int update(Wallet wallet);
 
     int delete(@Param("id") Long id, @Param("memberId") Long memberId);
+
+    /** 순서(sort_order) 변경 */
+    int updateSortOrder(@Param("id") Long id, @Param("memberId") Long memberId, @Param("sortOrder") int sortOrder);
+
+    /** 해당 타입의 현재 최대 sort_order (신규 계좌를 맨 뒤에 배치) */
+    Integer maxSortOrder(@Param("memberId") Long memberId, @Param("type") String type);
 }

src/main/java/com/sb/web/account/service/AccountService.java

@@ -301,10 +301,25 @@ public class AccountService {
     public WalletResponse createWallet(WalletRequest req, Long memberId) {
         Wallet wallet = toWallet(req);
         wallet.setMemberId(memberId);
+        Integer max = walletMapper.maxSortOrder(memberId, req.getType());
+        wallet.setSortOrder(max == null ? 0 : max + 1); // 같은 타입의 맨 뒤
         walletMapper.insert(wallet);
         return WalletResponse.from(wallet, wallet.getOpeningBalance()); // 신규 → 잔액=초기잔액
     }
 
+    /** 드래그앤드랍 순서 변경: 전달된 id 순서대로 sort_order 재설정 (본인·동일 타입만) */
+    @Transactional
+    public List<WalletResponse> reorderWallets(Long memberId, String type, List<Long> ids) {
+        int i = 0;
+        for (Long id : ids) {
+            Wallet w = walletMapper.findByIdAndMember(id, memberId);
+            if (w != null && w.getType().equals(type)) {
+                walletMapper.updateSortOrder(id, memberId, i++);
+            }
+        }
+        return listWallets(memberId);
+    }
+
     @Transactional
     public WalletResponse updateWallet(Long id, WalletRequest req, Long memberId) {
         Wallet wallet = mustFindWallet(id, memberId);

src/main/java/com/sb/web/account/service/AccountSettingService.java

@@ -6,7 +6,7 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 /**
- * 사용자별 가계부 설정 서비스 (월 예상 수입 등).
+ * 월 예상 수입 설정 서비스 (월별).
  */
 @Service
 @RequiredArgsConstructor
@@ -14,12 +14,12 @@ public class AccountSettingService {
 
     private final AccountSettingMapper settingMapper;
 
-    public Long getExpectedIncome(Long memberId) {
-        return settingMapper.findExpectedIncome(memberId);
+    public Long getExpectedIncome(Long memberId, int year, int month) {
+        return settingMapper.findExpectedIncome(memberId, year, month);
     }
 
     @Transactional
-    public void setExpectedIncome(Long memberId, Long expectedIncome) {
-        settingMapper.upsertExpectedIncome(memberId, expectedIncome);
+    public void setExpectedIncome(Long memberId, int year, int month, Long expectedIncome) {
+        settingMapper.upsertExpectedIncome(memberId, year, month, expectedIncome);
     }
 }