null로 저장되게 성공시킴

frontend/lib/api/externalRestApiConnection.ts

@@ -192,6 +192,43 @@ export class ExternalRestApiConnectionAPI {
     return response.data;
   }
 
+  /**
+   * REST API 데이터 조회 (화면관리용 프록시)
+   */
+  static async fetchData(
+    connectionId: number,
+    endpoint?: string,
+    jsonPath?: string,
+  ): Promise<{
+    rows: any[];
+    columns: Array<{ columnName: string; columnLabel: string; dataType: string }>;
+    total: number;
+    connectionInfo: {
+      connectionId: number;
+      connectionName: string;
+      baseUrl: string;
+      endpoint: string;
+    };
+  }> {
+    const response = await apiClient.post<ApiResponse<{
+      rows: any[];
+      columns: Array<{ columnName: string; columnLabel: string; dataType: string }>;
+      total: number;
+      connectionInfo: {
+        connectionId: number;
+        connectionName: string;
+        baseUrl: string;
+        endpoint: string;
+      };
+    }>>(`${this.BASE_PATH}/${connectionId}/fetch`, { endpoint, jsonPath });
+
+    if (!response.data.success) {
+      throw new Error(response.data.message || "REST API 데이터 조회에 실패했습니다.");
+    }
+
+    return response.data.data!;
+  }
+
   /**
    * 지원되는 인증 타입 목록
    */