fix: add datatype prop

packages/nocodb-sdk/src/lib/sqlUi/PgUi.ts

@@ -1692,6 +1692,7 @@ export class PgUi {
         colProp.cdf = 'now()';
         break;
       case 'LastModifiedTime':
+        colProp.dt = 'timestamp';
         colProp.cdf = 'now()';
         colProp.au = true;
         break;

packages/nocodb/src/services/columns.service.ts

@@ -1722,6 +1722,8 @@ export class ColumnsService {
             }
 
             {
+              colBody = await getColumnPropsFromUIDT(colBody, source);
+
               // remove default value for SQLite since it doesn't support default value as function when adding column
               // only support default value as constant value
               if (source.type === 'sqlite3') {