diff --git a/backend-node/src/routes/dataRoutes.ts b/backend-node/src/routes/dataRoutes.ts
index c696d5de..f87aa5d6 100644
--- a/backend-node/src/routes/dataRoutes.ts
+++ b/backend-node/src/routes/dataRoutes.ts
@@ -14,8 +14,17 @@ router.get(
   authenticateToken,
   async (req: AuthenticatedRequest, res) => {
     try {
-      const { leftTable, rightTable, leftColumn, rightColumn, leftValue, dataFilter, enableEntityJoin, displayColumns, deduplication } =
-        req.query;
+      const {
+        leftTable,
+        rightTable,
+        leftColumn,
+        rightColumn,
+        leftValue,
+        dataFilter,
+        enableEntityJoin,
+        displayColumns,
+        deduplication,
+      } = req.query;
 
       // 입력값 검증
       if (!leftTable || !rightTable || !leftColumn || !rightColumn) {
@@ -38,7 +47,9 @@ router.get(
       }
 
       // 🆕 enableEntityJoin 파싱
-      const enableEntityJoinFlag = enableEntityJoin === "true" || enableEntityJoin === true;
+      const enableEntityJoinFlag =
+        enableEntityJoin === "true" ||
+        (typeof enableEntityJoin === "boolean" && enableEntityJoin);
 
       // SQL 인젝션 방지를 위한 검증
       const tables = [leftTable as string, rightTable as string];
@@ -68,7 +79,9 @@ router.get(
       const userCompany = req.user?.companyCode;
 
       // displayColumns 파싱 (item_info.item_name 등)
-      let parsedDisplayColumns: Array<{ name: string; label?: string }> | undefined;
+      let parsedDisplayColumns:
+        | Array<{ name: string; label?: string }>
+        | undefined;
       if (displayColumns) {
         try {
           parsedDisplayColumns = JSON.parse(displayColumns as string);
@@ -78,12 +91,14 @@ router.get(
       }
 
       // 🆕 deduplication 파싱
-      let parsedDeduplication: {
-        enabled: boolean;
-        groupByColumn: string;
-        keepStrategy: "latest" | "earliest" | "base_price" | "current_date";
-        sortColumn?: string;
-      } | undefined;
+      let parsedDeduplication:
+        | {
+            enabled: boolean;
+            groupByColumn: string;
+            keepStrategy: "latest" | "earliest" | "base_price" | "current_date";
+            sortColumn?: string;
+          }
+        | undefined;
       if (deduplication) {
         try {
           parsedDeduplication = JSON.parse(deduplication as string);
@@ -340,30 +355,37 @@ router.get(
       }
 
       const { enableEntityJoin, groupByColumns } = req.query;
-      const enableEntityJoinFlag = enableEntityJoin === "true" || enableEntityJoin === true;
-      
+      const enableEntityJoinFlag =
+        enableEntityJoin === "true" ||
+        (typeof enableEntityJoin === "boolean" && enableEntityJoin);
+
       // groupByColumns 파싱 (JSON 문자열 또는 쉼표 구분)
       let groupByColumnsArray: string[] = [];
       if (groupByColumns) {
         try {
           if (typeof groupByColumns === "string") {
             // JSON 형식이면 파싱, 아니면 쉼표로 분리
-            groupByColumnsArray = groupByColumns.startsWith("[") 
-              ? JSON.parse(groupByColumns) 
-              : groupByColumns.split(",").map(c => c.trim());
+            groupByColumnsArray = groupByColumns.startsWith("[")
+              ? JSON.parse(groupByColumns)
+              : groupByColumns.split(",").map((c) => c.trim());
           }
         } catch (error) {
           console.warn("groupByColumns 파싱 실패:", error);
         }
       }
 
-      console.log(`🔍 레코드 상세 조회: ${tableName}/${id}`, { 
+      console.log(`🔍 레코드 상세 조회: ${tableName}/${id}`, {
         enableEntityJoin: enableEntityJoinFlag,
-        groupByColumns: groupByColumnsArray 
+        groupByColumns: groupByColumnsArray,
       });
 
       // 레코드 상세 조회 (Entity Join 옵션 + 그룹핑 옵션 포함)
-      const result = await dataService.getRecordDetail(tableName, id, enableEntityJoinFlag, groupByColumnsArray);
+      const result = await dataService.getRecordDetail(
+        tableName,
+        id,
+        enableEntityJoinFlag,
+        groupByColumnsArray
+      );
 
       if (!result.success) {
         return res.status(400).json(result);
@@ -396,7 +418,7 @@ router.get(
 /**
  * 그룹화된 데이터 UPSERT API
  * POST /api/data/upsert-grouped
- * 
+ *
  * 요청 본문:
  * {
  *   tableName: string,
@@ -415,7 +437,8 @@ router.post(
       if (!tableName || !parentKeys || !records || !Array.isArray(records)) {
         return res.status(400).json({
           success: false,
-          message: "필수 파라미터가 누락되었습니다 (tableName, parentKeys, records).",
+          message:
+            "필수 파라미터가 누락되었습니다 (tableName, parentKeys, records).",
           error: "MISSING_PARAMETERS",
         });
       }
@@ -450,17 +473,17 @@ router.post(
       }
 
       console.log(`✅ 그룹화된 데이터 UPSERT 성공: ${tableName}`, {
-        inserted: result.inserted,
-        updated: result.updated,
-        deleted: result.deleted,
+        inserted: result.data?.inserted || 0,
+        updated: result.data?.updated || 0,
+        deleted: result.data?.deleted || 0,
       });
 
       return res.json({
         success: true,
         message: "데이터가 저장되었습니다.",
-        inserted: result.inserted,
-        updated: result.updated,
-        deleted: result.deleted,
+        inserted: result.data?.inserted || 0,
+        updated: result.data?.updated || 0,
+        deleted: result.data?.deleted || 0,
       });
     } catch (error) {
       console.error("그룹화된 데이터 UPSERT 오류:", error);
@@ -506,16 +529,22 @@ router.post(
 
       // company_code와 company_name 자동 추가 (멀티테넌시)
       const enrichedData = { ...data };
-      
+
       // 테이블에 company_code 컬럼이 있는지 확인하고 자동으로 추가
-      const hasCompanyCode = await dataService.checkColumnExists(tableName, "company_code");
+      const hasCompanyCode = await dataService.checkColumnExists(
+        tableName,
+        "company_code"
+      );
       if (hasCompanyCode && req.user?.companyCode) {
         enrichedData.company_code = req.user.companyCode;
         console.log(`🏢 company_code 자동 추가: ${req.user.companyCode}`);
       }
-      
+
       // 테이블에 company_name 컬럼이 있는지 확인하고 자동으로 추가
-      const hasCompanyName = await dataService.checkColumnExists(tableName, "company_name");
+      const hasCompanyName = await dataService.checkColumnExists(
+        tableName,
+        "company_name"
+      );
       if (hasCompanyName && req.user?.companyName) {
         enrichedData.company_name = req.user.companyName;
         console.log(`🏢 company_name 자동 추가: ${req.user.companyName}`);
@@ -679,7 +708,10 @@ router.post(
 
       console.log(`🗑️ 그룹 삭제:`, { tableName, filterConditions });
 
-      const result = await dataService.deleteGroupRecords(tableName, filterConditions);
+      const result = await dataService.deleteGroupRecords(
+        tableName,
+        filterConditions
+      );
 
       if (!result.success) {
         return res.status(400).json(result);
diff --git a/backend-node/src/types/express.d.ts b/backend-node/src/types/express.d.ts
new file mode 100644
index 00000000..8f456992
--- /dev/null
+++ b/backend-node/src/types/express.d.ts
@@ -0,0 +1,13 @@
+import "express";
+
+declare module "express-serve-static-core" {
+  interface Request {
+    user?: {
+      userId: string;
+      companyCode: string;
+      userType: string;
+      locale?: string;
+    };
+  }
+}
+