PBI Service as a Data Warehouse

Good day,

I dont have an integration layer db or tool but only PBI directly to an AWS RDS Read Replica

The product data overwrites at times and data is in some areas alrge and others only stored for 6 months

1. How do i use PBI service as a data warehouse?

2. How does data get ingested into the PBI data warehouse to be appended and stored over time?

3. I would like to do some manipulation, like sql views within the PBI service

Kindly advise if this is possible using PBI services and some options please?

Small organization using E5 license with PowerBI Pro

Regards