feat: duplicate column support

packages/nocodb/src/modules/jobs/jobs/export-import/import.service.ts

@@ -766,6 +766,8 @@ export class ImportService {
             a.uidt === UITypes.Rollup ||
             a.uidt === UITypes.Formula ||
             a.uidt === UITypes.QrCode ||
+            a.uidt === UITypes.CreateTime ||
+            a.uidt === UITypes.LastModifiedTime ||
             a.uidt === UITypes.Barcode,
         ),
       );
@@ -886,6 +888,26 @@ export class ImportService {
           user: param.user,
         });
 
+        for (const nColumn of freshModelData.columns) {
+          if (nColumn.title === col.title) {
+            idMap.set(col.id, nColumn.id);
+            break;
+          }
+        }
+      } else if (
+        col.uidt === UITypes.CreateTime ||
+        col.uidt === UITypes.LastModifiedTime
+      ) {
+        const freshModelData = await this.columnsService.columnAdd({
+          tableId: getIdOrExternalId(getParentIdentifier(col.id)),
+          column: withoutId({
+            ...flatCol,
+            system: false,
+          }) as any,
+          req: param.req,
+          user: param.user,
+        });
+
         for (const nColumn of freshModelData.columns) {
           if (nColumn.title === col.title) {
             idMap.set(col.id, nColumn.id);