Hi Yuan,
Thank you for reaching out. This is actually intended behavior to only provide the current budget and bid data via these resource queries. For the change status, you could try to query the change_status resource. However, it could only provide some limited change data.
Thanks and regards,
Xiaoming, Google Ads API Team
Hi Yuan,
Thank you for reaching out. I have submitted a feature request to support the snapshots of budget and bid information in the Google Ads API. Please keep an eye on our blog for the announcements and updates on new releases.
Thanks and regards,
Xiaoming, Google Ads API Team