Is there any data API for creating/saving multiple data records . Below API is only handling one data record
api/application/v2/data/{data_view_ID}
This is accepting savable data page with only Page structure, its not accepting of type List.
This is the recommended OOTB API to save data records. You have to run a API in a loop so that each saves each record one after another.
I have at least 100-120 records, so firing that many REST API calls will affect the system . So, looking for any DX API which can save multiple records in one shot.
120 records is a small number and should be done withing a few minutes. You can queue the process to run it without affecting the system, else you can run it when live users are not logged in.