전일대비 부호 및 API 데이터 파싱 로직 개선:

- `utils.ts`: 전일대비 부호 매핑 로직(1=상한가, 4=하한가) 수정 및 관련 함수(`sigToArrow`, `sigClass`) 업데이트.
- `types.ts`: `IndexQuote` 인터페이스의 `value` 필드명을 `price`로 수정.
- `kiwoom_ws_service.go`, `theme_service.go`, `kiwoom_service.go`: 전일대비 데이터 파싱 시 부호 결정 로직 추가(`signedChange`, `signedChangeBySig`) 및 관련 함수 호출로 대체.
- 기존 `predPre` 처리 부분을 양수/음수를 정확히 계산하도록 변경.
- `kospi200_service.go`: `PredPre` 필드 부호 처리 로직(`signedChangeBySig`) 추가.
- Svelte 페이지 업데이트:
  - `+page.svelte` 파일에서 `value` 필드를 `price`로 대체.
  - `theme` 및 `kospi200` 페이지에서 전일대비 표시값 절댓값으로 렌더링되도록 수정 (`Math.abs` 적용).

frontend/src/lib/api/types.ts

@@ -149,7 +149,7 @@ export interface WatchlistItem {
 
 export interface IndexQuote {
   name: string
-  value: number
+  price: number
   change: number
   changeRate: number
 }

frontend/src/lib/utils.ts

@@ -39,16 +39,16 @@ export function formatDate(iso: string): string {
   return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`
 }
 
-// 전일대비 부호 문자 (2=상승, 3=보합, 5=하락)
+// 전일대비 부호 문자 (1=상한가, 2=상승, 3=보합, 4=하한가, 5=하락)
 export function sigToArrow(sig: string): string {
-  if (sig === '2') return '▲'
-  if (sig === '5') return '▼'
+  if (sig === '1' || sig === '2') return '▲'
+  if (sig === '4' || sig === '5') return '▼'
   return '-'
 }
 
 // 전일대비 부호에 따른 클래스
 export function sigClass(sig: string): string {
-  if (sig === '2') return 'text-red-400'
-  if (sig === '5') return 'text-blue-400'
+  if (sig === '1' || sig === '2') return 'text-red-400'
+  if (sig === '4' || sig === '5') return 'text-blue-400'
   return 'text-gray-400'
 }

frontend/src/routes/(app)/+page.svelte

@@ -296,7 +296,7 @@
     {#each indices as idx}
       <div class="bg-gray-800 rounded-lg px-4 py-3">
         <div class="text-xs text-gray-400 mb-1">{idx.name}</div>
-        <div class="text-lg font-bold text-white">{idx.value.toLocaleString('ko-KR', { maximumFractionDigits: 2 })}</div>
+        <div class="text-lg font-bold text-white">{idx.price.toLocaleString('ko-KR', { maximumFractionDigits: 2 })}</div>
         <div class="text-sm {priceClass(idx.changeRate)}">{formatRate(idx.changeRate)}</div>
       </div>
     {/each}

frontend/src/routes/(app)/kospi200/+page.svelte

@@ -97,7 +97,7 @@
                 {stock.curPrc.toLocaleString()}
               </td>
               <td class="px-3 py-3 text-right text-sm {sigClass(stock.predPreSig)}">
-                {sigToArrow(stock.predPreSig)} {stock.predPre.toLocaleString()}
+                {sigToArrow(stock.predPreSig)} {Math.abs(stock.predPre).toLocaleString()}
               </td>
               <td class="px-3 py-3 text-right text-sm {priceClass(stock.fluRt)}">
                 {formatRate(stock.fluRt)}

frontend/src/routes/(app)/theme/+page.svelte

@@ -190,7 +190,7 @@
                   {stock.curPrc.toLocaleString()}
                 </td>
                 <td class="px-3 py-3 text-right text-sm {priceClass(stock.fluRt)}">
-                  {sigToArrow(stock.fluSig)}{stock.predPre.toLocaleString()}
+                  {sigToArrow(stock.fluSig)}{Math.abs(stock.predPre).toLocaleString()}
                 </td>
                 <td class="px-3 py-3 text-right text-sm {priceClass(stock.fluRt)}">
                   {formatRate(stock.fluRt)}

services/kiwoom_service.go

@@ -219,12 +219,11 @@ func (k *KiwoomClient) fetchPrice(stkCd string) (*models.StockPrice, error) {
 	if result.ReturnCode != 0 {
 		return nil, fmt.Errorf("현재가 조회 실패: %s", result.ReturnMsg)
 	}
-
 	price := &models.StockPrice{
 		Code:         displayCode,
 		Name:         result.StkNm,
 		CurrentPrice: absParseIntSafe(result.CurPrc),
-		ChangePrice:  parseIntSafe(result.PredPre),
+		ChangePrice:  signedChange(result.PredPre, result.FluRt),
 		ChangeRate:   parseFloatSafe(result.FluRt),
 		Volume:       absParseIntSafe(result.TrdeQty),
 		High:         absParseIntSafe(result.HighPric),
@@ -451,7 +450,7 @@ func (k *KiwoomClient) GetTopVolumeStocks(market string, count int) ([]models.St
 			Code:         row.StkCd,
 			Name:         row.StkNm,
 			CurrentPrice: absParseIntSafe(row.CurPrc),
-			ChangePrice:  parseIntSafe(row.PredPre),
+			ChangePrice:  signedChange(row.PredPre, row.FluRt),
 			ChangeRate:   parseFloatSafe(row.FluRt),
 			Volume:       absParseIntSafe(row.TrdeQty),
 			Market:       mktName,
@@ -559,7 +558,7 @@ func (k *KiwoomClient) GetTopFluctuation(market string, ascending bool, count in
 			Code:         row.StkCd,
 			Name:         row.StkNm,
 			CurrentPrice: absParseIntSafe(row.CurPrc),
-			ChangePrice:  parseIntSafe(row.PredPre),
+			ChangePrice:  signedChange(row.PredPre, row.FluRt),
 			ChangeRate:   parseFloatSafe(row.FluRt),
 			Volume:       absParseIntSafe(row.NowTrdeQty),
 			CntrStr:      parseFloatSafe(row.CntrStr),
@@ -588,6 +587,27 @@ func absParseIntSafe(s string) int64 {
 	return n
 }
 
+// signedChange 전일대비를 절댓값으로 파싱 후 등락률 부호에 맞춰 부호 결정
+// 키움 API의 pred_pre 필드는 가격 필드처럼 부호가 방향 표시용이므로 flu_rt 기준으로 부호 결정
+func signedChange(predPre string, fluRt string) int64 {
+	n := absParseIntSafe(predPre)
+	rate := parseFloatSafe(fluRt)
+	if rate < 0 {
+		return -n
+	}
+	return n
+}
+
+// signedChangeBySig 전일대비를 절댓값으로 파싱 후 flu_sig(등락기호) 기준으로 부호 결정
+// flu_sig: 1=상한가, 2=상승, 3=보합, 4=하한가, 5=하락
+func signedChangeBySig(predPre string, fluSig string) int64 {
+	n := absParseIntSafe(predPre)
+	if fluSig == "4" || fluSig == "5" {
+		return -n
+	}
+	return n
+}
+
 func parseFloatSafe(s string) float64 {
 	s = strings.ReplaceAll(s, ",", "")
 	s = strings.TrimPrefix(s, "+")

services/kiwoom_ws_service.go

@@ -434,11 +434,17 @@ func (k *KiwoomWSClient) reconnect() {
 func parseRealPrice(code string, v map[string]string) *models.StockPrice {
 	normalized := strings.TrimPrefix(code, "A")
 	normalized = strings.SplitN(normalized, "_", 2)[0] // _NX, _AL 등 접미사 제거
+	// 전일대비(v["11"])는 절댓값으로 파싱 후, 등락률(v["12"]) 부호에 맞춰 부호 결정
+	changeAbs := absInt(parseWSInt(v["11"]))
+	changeRate := parseWSFloat(v["12"])
+	if changeRate < 0 {
+		changeAbs = -changeAbs
+	}
 	return &models.StockPrice{
 		Code:         normalized,
 		CurrentPrice: absInt(parseWSInt(v["10"])),
-		ChangePrice:  parseWSInt(v["11"]),
-		ChangeRate:   parseWSFloat(v["12"]),
+		ChangePrice:  changeAbs,
+		ChangeRate:   changeRate,
 		Volume:       absInt(parseWSInt(v["13"])),
 		TradeMoney:   absInt(parseWSInt(v["14"])),
 		TradeVolume:  absInt(parseWSInt(v["15"])),
@@ -458,11 +464,17 @@ func parseRealPrice(code string, v map[string]string) *models.StockPrice {
 func parseExpectedPrice(code string, v map[string]string) *models.StockPrice {
 	normalized := strings.TrimPrefix(code, "A")
 	normalized = strings.SplitN(normalized, "_", 2)[0]
+	// 전일대비(v["11"])는 절댓값으로 파싱 후, 등락률(v["12"]) 부호에 맞춰 부호 결정
+	expChangeAbs := absInt(parseWSInt(v["11"]))
+	expChangeRate := parseWSFloat(v["12"])
+	if expChangeRate < 0 {
+		expChangeAbs = -expChangeAbs
+	}
 	return &models.StockPrice{
 		Code:         normalized,
 		CurrentPrice: absInt(parseWSInt(v["10"])),
-		ChangePrice:  parseWSInt(v["11"]),
-		ChangeRate:   parseWSFloat(v["12"]),
+		ChangePrice:  expChangeAbs,
+		ChangeRate:   expChangeRate,
 		TradeVolume:  absInt(parseWSInt(v["15"])),
 		Volume:       absInt(parseWSInt(v["13"])),
 		TradeTime:    v["20"],

services/kospi200_service.go

@@ -85,7 +85,7 @@ func (s *Kospi200Service) GetStocks() ([]models.Kospi200Stock, error) {
 				Name:       s.StkNm,
 				CurPrc:     absParseIntSafe(s.CurPrc),
 				PredPreSig: s.PredPreSig,
-				PredPre:    parseIntSafe(s.PredPre),
+				PredPre:    signedChangeBySig(s.PredPre, s.PredPreSig),
 				FluRt:      parseFloatSafe(s.FluRt),
 				Volume:     absParseIntSafe(s.NowTrdeQty),
 				Open:       absParseIntSafe(s.OpenPric),

services/theme_service.go

@@ -109,8 +109,8 @@ func (s *ThemeService) GetThemeStocks(themeCode, dateTp string) (*models.ThemeDe
 	}
 
 	var result struct {
-		FluRt      string `json:"flu_rt"`
-		DtPrftRt   string `json:"dt_prft_rt"`
+		FluRt        string `json:"flu_rt"`
+		DtPrftRt     string `json:"dt_prft_rt"`
 		ThemaCompStk []struct {
 			StkCd   string `json:"stk_cd"`
 			StkNm   string `json:"stk_nm"`
@@ -136,7 +136,7 @@ func (s *ThemeService) GetThemeStocks(themeCode, dateTp string) (*models.ThemeDe
 			Name:    s.StkNm,
 			CurPrc:  absParseIntSafe(s.CurPrc),
 			FluSig:  s.FluSig,
-			PredPre: parseIntSafe(s.PredPre),
+			PredPre: signedChangeBySig(s.PredPre, s.FluSig),
 			FluRt:   parseFloatSafe(strings.TrimPrefix(s.FluRt, "+")),
 		})
 	}