✨ 매도 이후 보유 수량이 0 이하인 경우 marketholding 제거

src/main/java/com/hackathon/tomolow/domain/transaction/service/MarketTransactionService.java

@@ -130,6 +130,7 @@ public void marketSell(Long marketId, OrderRequestDto orderRequestDto) {
     BigDecimal totalPrice = price.multiply(BigDecimal.valueOf(quantity));
     user.addCashBalance(totalPrice);
     user.subtractInvestmentBalance(totalPrice);
+    if (userMarketHolding.getQuantity() <= 0) userMarketHoldingRepository.delete(userMarketHolding);
 
     // 4. 체결 내역 DB에 저장
     Transaction transaction =

src/main/java/com/hackathon/tomolow/domain/transaction/service/MatchService.java

@@ -142,7 +142,8 @@ private void executeBuy(String marketId, String orderId, BigDecimal tradePrice,
     log.info("매수 체결 - orderId : " + orderId);
   }
 
-  private void executeSell(String marketId, String orderId, BigDecimal tradePrice, int quantity) {
+  @Transactional
+  public void executeSell(String marketId, String orderId, BigDecimal tradePrice, int quantity) {
     Market market =
         marketRepository
             .findById(Long.valueOf(marketId))
@@ -190,6 +191,7 @@ private void executeSell(String marketId, String orderId, BigDecimal tradePrice,
 
     // 4. 잔여 수량 갱신
     orderRedisService.updateOrRemove(orderId, marketId, TradeType.SELL, quantity);
+    if (holding.getQuantity() <= 0) userMarketHoldingRepository.delete(holding);
 
     // 5. 체결 내역 DB에 저장
     Transaction transaction =

src/main/java/com/hackathon/tomolow/domain/userGroupStockHolding/service/UserGroupMarketHoldingService.java

@@ -6,6 +6,7 @@
 import java.util.List;
 
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import com.hackathon.tomolow.domain.ticker.service.PriceQueryService;
 import com.hackathon.tomolow.domain.userGroup.entity.UserGroup;
@@ -27,19 +28,24 @@ public class UserGroupMarketHoldingService {
   private final GroupOrderInfoService groupOrderInfoService;
 
   /** 마켓별로 사용자의 PnL 계산 */
+  @Transactional
   public UserGroupMarketHoldingPnLDto getPnLByUserGroupAndMarket(UserGroup userGroup) {
 
     // 1. 사용자가 해당 그룹 내에서 소유하고 있는 마켓 조회
     List<UserGroupMarketHolding> userGroupMarketHoldings =
         userGroupMarketHoldingRepository.findByUserGroup_Id(userGroup.getId());
 
-    if (userGroupMarketHoldings.isEmpty()) {
+    if (userGroupMarketHoldings.isEmpty())
       return UserGroupMarketHoldingPnLDto.builder().pnLDtos(List.of()).build();
-    }
 
     // 2. 마켓별로 손익금액과 손익률 계산
     List<UserGroupMarketHoldingPnLDto.SinglePnLDto> pnLDtos = new ArrayList<>();
     for (UserGroupMarketHolding holding : userGroupMarketHoldings) {
+      if (holding.getQuantity() <= 0) {
+        userGroupMarketHoldingRepository.delete(holding);
+        continue;
+      }
+
       // 2-1. 해당 마켓의 평균 매수가 / 실시간 가격 조회
       BigDecimal avgPrice = holding.getAvgPrice();
       BigDecimal lastTradePrice = null;

src/main/java/com/hackathon/tomolow/domain/userGroupTransaction/service/MarketGroupOrderService.java

@@ -123,6 +123,8 @@ public void marketSell(
     BigDecimal totalPrice = price.multiply(BigDecimal.valueOf(quantity));
     userGroup.addCash(totalPrice);
     userGroup.subtractInvestment(totalPrice);
+    if (userGroupMarketHolding.getQuantity() <= 0)
+      userGroupMarketHoldingRepository.delete(userGroupMarketHolding);
 
     // 5. 체결 내역 DB에 저장
     UserGroupTransaction transaction =

src/main/java/com/hackathon/tomolow/domain/userGroupTransaction/service/UserGroupOrderMatchService.java

@@ -126,7 +126,8 @@ private void executeBuy(
     log.info("그룹 매수 체결 - orderId : " + orderId);
   }
 
-  private void executeSell(
+  @Transactional
+  public void executeSell(
       String marketId, String groupId, String orderId, BigDecimal tradePrice, int quantity) {
     Market market =
         marketRepository
@@ -167,6 +168,7 @@ private void executeSell(
 
     // 4. 잔여 수량 갱신
     groupOrderRedisService.updateOrRemove(orderId, marketId, TradeType.SELL, quantity, groupId);
+    if (holding.getQuantity() <= 0) userGroupMarketHoldingRepository.delete(holding);
 
     // 5. 체결 내역 DB에 저장
     UserGroupTransaction transaction =