refactor: Enhance unique constraint validation across data operations

- Integrated `TableManagementService` to validate unique constraints before insert, update, and upsert actions in various controllers, including `dataflowExecutionController`, `dynamicFormController`, and `tableManagementController`.
- Improved error handling in `errorHandler` to provide detailed messages indicating which field has a unique constraint violation.
- Updated the `formatPgError` utility to extract and display specific column labels for unique constraint violations, enhancing user feedback.
- Adjusted the table schema retrieval to include company-specific nullable and unique constraints, ensuring accurate representation of database rules.

These changes improve data integrity by preventing duplicate entries and enhance user experience through clearer error messages related to unique constraints.

backend-node/src/routes/dataRoutes.ts

@@ -5,6 +5,8 @@ import { multiTableExcelService, TableChainConfig } from "../services/multiTable
 import { authenticateToken } from "../middleware/authMiddleware";
 import { AuthenticatedRequest } from "../types/auth";
 import { auditLogService } from "../services/auditLogService";
+import { TableManagementService } from "../services/tableManagementService";
+import { formatPgError } from "../utils/pgErrorUtil";
 
 const router = express.Router();
 
@@ -950,6 +952,20 @@ router.post(
         console.log(`🏢 company_name 자동 추가: ${req.user.companyName}`);
       }
 
+      // UNIQUE 제약조건 검증
+      const tms = new TableManagementService();
+      const uniqueViolations = await tms.validateUniqueConstraints(
+        tableName,
+        enrichedData,
+        req.user?.companyCode || "*"
+      );
+      if (uniqueViolations.length > 0) {
+        return res.status(400).json({
+          success: false,
+          message: `중복된 값이 존재합니다: ${uniqueViolations.join(", ")}`,
+        });
+      }
+
       // 레코드 생성
       const result = await dataService.createRecord(tableName, enrichedData);
 
@@ -1019,6 +1035,21 @@ router.put(
 
       console.log(`✏️ 레코드 수정: ${tableName}/${id}`, data);
 
+      // UNIQUE 제약조건 검증 (자기 자신 제외)
+      const tmsUpdate = new TableManagementService();
+      const uniqueViolations = await tmsUpdate.validateUniqueConstraints(
+        tableName,
+        data,
+        req.user?.companyCode || "*",
+        String(id)
+      );
+      if (uniqueViolations.length > 0) {
+        return res.status(400).json({
+          success: false,
+          message: `중복된 값이 존재합니다: ${uniqueViolations.join(", ")}`,
+        });
+      }
+
       // 레코드 수정
       const result = await dataService.updateRecord(tableName, id, data);