sounds like a standard BI platform. I'd reach for Google Data Studio, others like PowerBI.
No need to re-invent the wheel with your own DB.
https://www.reddit.com/r/PowerBI/comments/s3o6hi/the_most_in...
No need to re-invent the wheel with your own DB.
https://www.reddit.com/r/PowerBI/comments/s3o6hi/the_most_in...
However, I’m not aware of any BI platform providing APIs for data manipulation because displaying said data is usually the exclusive responsibility of a BI platform.